test-drb

test-drb@ccmp.vtda.org

101090 discussions

by evan＠snarc.net

Here's something neat: the VCF East 8.0 t-shirt art is being designed by George Beker, who did all the robot art for Creative Computing magazine and their "BASIC Computer Games" books. He's drawing a special "VCF Bot" for us -- and the ONLY way to get one is to attend the show.

14 years, 3 months

Restoration of a Zenith/Heathkit Z-100

by lbickley＠bickleywest.com

I recently acquired a Zenith/Heathkit Z-100. I almost didn't buy it because I have a number of S-100 bus systems, including an Intel 8080. But I was curious about its "dual processor" capabilities. So pack-rat that I am, I bought it. Here's the process I followed in my restoration: I checked out Herb Johnson's website which has a lot of good information on this system (http://www.retrotechnology.com/herbs_stuff/z100.html). I especially checked out his description of how to strip a Z-100 down to its motherboard (http://www.retrotechnology.com/restore/z_repair.html). I did just that - removed the floppy disk and hard disk unit from the Z-100. I then removed the outer case and keyboard. Next came the video board. I also removed the Floppy Disk controller and the Hard Disk controller from the S-100 bus on the motherboard. Next I disconnected the power connections from the motherboard and removed the keyboard and found the foam mounting material gooey and disintegrating (not unusual for vintage systems). Finally I removed the video controller from the motherboard. Stripping the system gave me the opportunity to check out the motherboard - both in terms of integrity and making sure that all the chips (which are socketed) were seated correctly. It also allowed me to document all of the jumper and switch settings on the motherboard. I found that the motherboard had been upgraded to the full 786KB of RAM. I examined the video daughter card - and found it had the full 64K of video RAM. I also found that the motherboard had been upgraded with a "UCI - ZSM 8Mhz" daughter card. I also noted that U146 had been modified with a 74L257 "stacked" on top of whatever chip was originally there. I have no Idea what that was for (if any of you do, please let me know!). I cleaned up the gooey foam and installed some Scotch two sided foam to replace it. I then put a dummy load on the power supply (switching supplies "like" loads). I used an old disk drive for the load (which I didn't care if it got destroyed by an aberrant voltage). I powered the system on - and the disk drive came up normally. I checked out all the power supply voltages: +16 was +15.98; +8 was +7.75; -16 was -16; +5 was +5.01 with 2mv of AC; +12 was 11.82 with 7mv of AC. Given these good readings, I was ready to re-install all the systems components - which I did. (BTW, while I was disassembling the system, I had made extensive notes on what cables went where, etc., so putting it back together was an easy task.) I then cleaned the contacts of the S-100 Floppy Disk Controller and Hard Disk Controller with DeoxIT Gold (formerly ProGold). I've found the stuff is terrific in making sure contacts have great conductivity - and stay that way. I then re-inserted both into the S-100 bus. I connected a video monitor to the system - turned it on - and then powered up the system. To my great (and pleasant) surprise, the screen indicated that the system tried to boot but found a hardware problem. Fortunately, the system's ROM has a number of built-in diagnostics. The "startup" diags passed, as did the memory and keyboard. However, the HDD could not be read. Before I jumped to the conclusion that the HDD was bad (it was spinning happily) - I decided to re-check my re-cabling. Sure enough, I had forgot to re-attach a power connector to the HDD separator board. After fixing my goof, I power up the system again - and to my super pleasure, it booted up to a prompt! I had hoped it would be CP/M - but instead it was Zenith DOS 2.11. I've played with the system a bit - including testing out the floppy disk drive - and backing up the DOS system. Everything seems to work well. Here's the Z-100's hardware configuration: Dual CPU 8085, 8088 RAM 768K Video RAM 64K, Color HDD 10MB FDD 320K (double side, dual density) 8MHz upgrade Cheers, Lyle -- Lyle Bickley, AF6WS Bickley Consulting West Inc. http://bickleywest.com "Black holes are where God is dividing by zero"

14 years, 3 months

Xerox IC house number cross-reference?

by ard＠p850ug1.demon.co.uk

Does anyone have a cross-refernece list for Xerox house-numbered ICs? The particular one I am looking for is 733W21L1 It's an 8 pin DIL package. Pins 1,5,8 are not used on the PCB. The others are the conventional op-amp pinout (2 = -ve input, 3 = +ve input, 4 = 0ve supply, 6 = output, 7 = +ve supply). I've replaced it with the obvious 741, and am getting rather better results than with the original (the output of which was stuck at 6V), but I'd like ot know if the original has any odd characteristics. -tony

14 years, 3 months

any interest in 3D printed DEC front panel toggle switches?

by legalize＠xmission.com

I know we can get the DEC board handles from Douglas. I seem to recall that there isn't a good supplier for the front panel toggle switches of various colors. Recently the Pocket Factory guys visited our make space and they were asking for ideas for little things they could print that could supply a market demand. <http://pocketfactory.org/> The only thing I could think of were the plastic toggle switches and board handles. I'd forgotten about Douglas supplying the board handles until our recent thread about Qbus prototying boards. Is there a supplier for the toggle switches? Obviously printed parts aren't molded so they are obvious replicas, but they can be cheaply made in small quantities if a design file is available. If this is something you'd like to try out, I suggest you contact the pocket factory folks directly at hello at pocketfactory.org. I discussed the idea with them last week, so if you reply relatively soon, they should remember the conversation. -- "The Direct3D Graphics Pipeline" -- DirectX 9 version available for download <http://legalizeadulthood.wordpress.com/the-direct3d-graphics-pipeline/> Legalize Adulthood! <http://legalizeadulthood.wordpress.com>

14 years, 3 months

ISC history

by dm561＠torfree.net

------ Original Message: Date: Sat, 04 Feb 2012 18:00:55 -0800 From: Eric Smith <eric at brouhaha.com> Richard wrote: >> If so many InteColor terminals were sold, where did they all end up? > In the landfill, just like everything else that was made in the 1970s. Even in the 80s ;-) We scrapped several hundred of several later models that had been sitting on bond traders' desks; might still have some manuals somewhere if anyone's interested. m

14 years, 3 months

Computer Language magazine 1986

by d_cymbal＠hotmail.com

I am trying to find reprints of "Interpreter Design and Construction" (parts I and II) by Dave Taylor in Computer Language July and September 1986. If anyone can help please drop me a message. Thanks.

14 years, 3 months

IC Pulls

by jws＠jwsss.com

I have a come into an opportunity which people here might help with. The opportunity is a 75 to 100# box of Eproms. So far w/o any major skimming yielded 2732's 2764's 27128's 27512's and the 1mb 27 series (don't recall the # right now)> I also found a couple of parts that traced back to an HP inhouse 27128 part from AMD. These were recently pulled from a warehouse full of printer material, and are were just packed loose in a 12" x 12" x 12" box for gold scrap. Since there was not manpower or time to sort, this what I got. There are other boxes of NOS which I will deal with later. Any ideas on what to do, what the chances are that they will work? I don't have the means or time to do testing, though recent discussion suggest there might be some cheap eprom programmer which might do that. I have never blown up a prom from normal handling, w/o antistat but with the shear number of parts here, the odds are that some are blown. I am handling these now with antistat, but the prior situation is what it is. Should I sort them by part, list them with a "if it doesn't work I'll send you another", sell them as untested pull lots (I will sort and tube them by type a and PN as my contribution to this project), or some other way? I'm guessing 10000 or more parts, don't know for now. also there could be other parts at lower layers, for now w/o pulling them and risk physical or electrical damage all I see are eproms and some junk pals which will go back into the stew for gold recycle. thanks Jim

14 years, 3 months

OT : Strange production method

by ard＠p850ug1.demon.co.uk

This has nothign to do with vintage computers, really. It related to a telepone, and not a particularly old one... But since some of you have knoweldge of production methods, I wonder if you have any thoughs on this. I have a basic 2-piece landline telephone here. Inside is a PCB with qutie a few discrete components (transsitors diodes, passives) and a single IC, which is clearly the dialer. Now the PCB has pads for an 18 pin DIL pacakge, but that's not waht's fitted. Instead there are 1 9-pin headers osldered to the main PCB. On tol fo those is an other little PCB connecting to the 'top 16' pins -- pins 8 and 9 of the origianl DIL position are not connected -- but then they go nowhere o nthe main PCB either. On this litle PCB which is fitted track-side up is a single epoxy-capped IC. I traced out the connections to the dialer keypad, ceramin resonator, poerr and ground in the hope I could identify the device. I then desoldered the header pins from the pin PCB and pulled the assembly out. On the underside (plain side) of this little IC-carrier is silk-screened 'SC91710A'. I ahve typed that into datsheetarchive. It exists as an IC. An 18 pin DIL IC that's a telephone dialer circuit. And all the pins I'd traced match up perfectly. Pins 8 and 9 are for a handsfree function that's not implemented here. So this telephone was clearly designed to use that dialer IC in the DIL package. My question is why was this subassembly made and fitted? I can understand that a driect-on-board IC is cheaper than fitting a DIL pacakge in many cases (for all I find such things objectionable!). But I can't beelive making up this daughterboard and fittign it with the header strips is cheaper than a DIL packaged IC -- is it? -tony

14 years, 3 months

ISC history

by aek＠bitsavers.org

http://peripheralexchange.com/aboutus/aboutus2.htm Detailed History Of ISC / Intecolor In 1973, Mr. Charles A. Muench formed a new company called Intelligent Systems Corporation (ISC). The ISC "basement team" designed a new color terminal product and began light product manufacturing in a prominent northeastern Atlanta neighborhood in the Riverview subdivision in Duluth, Georgia. The initial goal was to design an "intelligent" and affordable "color" cathode ray tube (CRT) terminal. Until this time, most computer terminals were "dumb" (text only) and only monochrome (black and white, green, or amber). ISC's new design was a breakthrough in terminal design since it offered an 8-color display with character graphics capability. The product was based on Intel Corporation's newest microprocessor product releases. At this point in time, Intel Corporation itself was not not much more out of the garage as a company than ISC. Although the Intel 4004 and 8008 products looked promising, ISC ultimately focused on the 8080 8-bit microprocessor from Intel. The Intel 8080 microprocessor married with additional integrated circuit chips from Texas Instruments (TI) made it possible to create the product. TI manufactured a support set of IC's such as the TMS5501 (multi-function I/O), TMS8224 (Clock/Divider), TMS8828 (Bus Controller), and TMS1702/2708/2716 family of Erasable Programmable Read Only Memory(s) (EPROMs). Once this collimation of IC products became generally available, it was the birth of many products with intelligence well beyond a simple four function calculator design. As the demand expanded and licensing to other chip manufacturers began, Advanced Micro Devices (AMD), National Semiconductor (NS), and a few others began cloning the TI chip designs. ISC's first product design used the Intel 8080 processor operating at slightly under 2Mhz along with 8KB of dynamic RAM for use as screen display memory, and about 1-3KB of operating system ROM. The unique design of ISC's "custom" display generator coupled with the Intel and TI chipsets was all that was needed to bring a new product to market. The ISC display generator used the latest IC technology with customized fuse-link ni-chrome devices. Essentially, this display generator used "lattice logic" to create text, color, and graphics. The "Compucolor 1" was the first intelligent color terminal product based on the 8080 microcomputer architecture. This product evolved rapidly and later was re-branded the name "Intecolor". The product name was derived from the founder's notion for the contracted words "Intelligent" and "Color" to come up with "Inte" and "color", or simply "Intecolor". On a parallel path, a consumer home computer product known as the Compucolor II was created by the same design team, and operated as an independent company called Compucolor Corporation. The Compucolor II was positioned as one of the early full featured home computer products selling in the $1,395 to $1,795 range. This product was considered to be the standard in home computing products years before Apple or IBM PC-based products. However, the history depicted here is not concentrated on the Compucolor II, but on the Intecolor brand of products. Why Develop Such A Product? The primary purpose for developing such a product was to fill a rising need from within the petrochemical, paper, electrical, and process control industry. The Intecolor terminal was the first of it's type in a market which was otherwise based on monochrome terminals with either no graphics or limited graphics ability. The Original 8001 Series In 1977, ISC's manufacturing operations relocated to a small warehouse and office space located at 5965A Peachtree Corners East in Norcross, Georgia. The first commercially available terminal product was the 8001 Series. Based on an RCA 19-inch delta-gun cathode ray tube (CRT) design, thousands of these terminals were sold. As newer CRT designs became available, the 8001 used a pre-converged in-line (PIL) CRT designs from Hitachi, Mitsubishi, and Panasonic. This product series lasted for 20 years. F8001G Industrial Terminal. The 8050/8060 Series In 1978, additional options were designed to extend terminal operations into one of the first standalone microcomputers. Operating systems incorporated within the product had included the BASIC language (in EPROM) which was based on Microsoft BASIC (at the time). Options for floppy disk drives (made by Wangco, Shugart, or Seimens), light pens (ICC), printer drivers (Centronics, Daisywriter, Okidata, Qume, Printronix), programming languages (BASIC, 8080 ASM, FORTRAN IV), and developer tools were added to the product line. During this time, there were fewer than three companies manufacturing color microcomputer based products with a robust peripheral offering. The 8050 Series was a self-contained microcomputer system having a proprietary file control system known as FCS. It was a precursor to today's DOS based systems. The 8060 Series was also a self-contained microcomputer system but designed on the CP/M operating system licensed from Digital Research Corporation which was founded by Gary Alan Kildall. Both the 8050 and 8060 Series products filled a niche until about 1988, at which point newer PC competitive products became the new platform of choice. More Manufacturing Space Required By 1979, sales of Intecolor terminal and microcomputer products had increased dramatically. With an immediate need for more manufacturing floor space, the sales and manufacturing portion of the company relocated to 225 Technology Park/Atlanta in Norcross, Georgia. The engineering, inventory, and board level manufacturing portions of the company remained in Peachtree Corners East until late 1987. As a side note: Technology Park/Atlanta was "the" place to have facilities since the office park was comprised of the "who's who" of high tech companies of that time. It was often termed as "Silicon Hill" (Georgia), patterned after Silicon Gulch (Texas), and Silicon Valley (California). Initial Public Offering (IPO) ... Going Public! By late 1980, Intelligent Systems Corporation prepared an initial public offering (IPO), and successfully went public on the NASDAQ market creating the necessary capital to expand sales and manufacturing. At this point in time, practically all industrial control integrators, were purchasing ISC terminals for their control systems. In the early 1980's, ISC created a Master Limited Partnership (MLP) for favorable corporate income tax purposes and acquired additional hardware and software products from other companies. The overall company effectively became known as "Intecolor an Intelligent Systems Company". The product name Intecolor became the new corporate name for this operating division of ISC. Other companies owned were Quadram Corporation, Princeton Graphics Systems, Peachtree Software, Datavue Corporation, and a few other less notable start-up companies. By 1981, the world was looking forward to the debut of IBM's "PC" architecture. At this point , the proprietary design of the 8001 terminal seemed to be in jeopardy, but PC or not, it remained in production until 1993. Cloning the Data And Graphics Terminal Markets In the 1982-1985 timeframe, Intecolor began manufacturing color terminal products to address the data management and scientific graphics markets hugely dominated by Digital Equipment Corporation (DEC) and Tektronix Corporation. Most notable were the Intecolor "ColorTrend" and Advanced Graphics Systems (AGS) terminal series. ColorTrend Series Models designed to compete for the DEC data terminal segment. The ColorTrend series targeted the DEC customer base since it was VT52/100/220 compatible. The AGS Series targeted the Tektronix customer base since it was 4010/4014/4105A compatible. The ColorTrend Series was moderately successful in the markets served by Northern Telecom and Baxter Health Care. Other customers also used the product since DEC had yet to release a color terminal product till the late 1980's. The same cannot be said for the AGS Series, since this market had many other competitive products from other vendors. It could be best described as low volume to a "write-off". Another later design based on "X" technology was designed, but failed due to competitive pressure from other vendors. By this time, Intecolor could not "pull another rabbit out of the hat" in custom terminal design. Time To Sell Off The Assets By 1986, Intelligent Systems Corporation MLP, realized that there was more profit to be made by selling individual business units since the stock price had peaked. Essentially, the marketable inventory, trademark, and patent rights, were sold to create profits. Individually, and in fairly rapid order, Quadram Corporation was sold to National Semiconductor. Princeton Graphics Systems was sold to Worldwide Technologies. Datavue Corporation was sold to a private entity. Peachtree Software was sold back to it's management/employee group (which is now owned by Sage Software). Intecolor Corporation was purchased by it's management/employee group with the help from it's founder. Intecolor, again reverted back to a privately held company owned by it's management team, employees (as 401K holders), and outside venture capitalists. New Manufacturing Location Needed Intecolor was paying for prime corporate office space along with remote warehouse spaces, which led to daily transportation of manufacturing goods from one location to another. Although, assembly operations at the Peachtree Corners East location were only a few miles away from the Technology Park/Atlanta corporate office, it became clear that the daily company truck routine was outgrowing itself. A centralized space was needed badly, and at an overall lower cost per square foot. By 1988, Intecolor decided to relocate to a new facility in the Gwinnett Forest complex at 2150 Boggs Road, Building 100, in Duluth, Georgia. This new 60,000 square foot facility allowed all operations under one roof. This new location was about 8 miles north of Norcross, Georgia and became the all-in-one facility for manufacturing, engineering, marketing, and sales. Since the distance >from the original offices to the new location were under 8 miles away, most employees were retained. For once, all aspects of the company resided in a central place making it much easier to conduct daily business. MegaTrend Monitors Monitor products addressing generic PC markets and custom monitors for OEM applications continued to evolve rapidly in the mid 1980's. Market conditions showed that large format color monitors were needed for the PC marketplace. The MegaTrend product line began it's humble beginnings as one of the first 19-inch CGA/EGA monitors available in the PC marketplace. So the "Mega" meaning big, and "Trend" meaning the trend towards larger displays, led to the product line name. As PC video standards evolved, many versions of the product line were manufactured to address standard video interfaces as well as custom "proprietary" interfaces. The MegaTrend was produced from 1985 till 1991. By this time, many OEM companies had settled on their own specific graphics generator and many other monitor manufacturers entered the marketplace. As time passed, many monitor designs were designed but not related to the MegaTrend Series. Future monitor designs took on a product nomenclature such as E01954-20x, or E20Hxxxxx. See Archived Monitors. New Terminal Product Offerings The original 8001 terminal series was showing it's age which led to the development and manufacture of the 8800 and 3800 series product lines. The 8001 product line utilized three independent logic boards to achieve a working product. Given advances in technology, the 8800 and 3800 series product lines were designed to have one logic board rather than three. Another major factor was an emphasis on customized enclosures and harsh environment designs. This added additional life to the specialized terminal market. The 8800 Series proved to be successful as the upgrade path from the 8001 series as well as the smaller 3800 series. Both the 3800 and 8800 series terminal product lines flourished until late 1993. What Happened To Intelligent Systems Corporation (ISC) MLP? After the sell-off of most of it's divisions, Intelligent Systems MLP evolved into a high-tech incubator company helping high technology start-up companies develop products or services. ISC still exists today but has no corporate or financial relationship to Intecolor. Visit www.intelsys.com to learn more about the modern day workings of ISC. 8001 Intecolor Terminal Emulation Software In 1991, Intecolor began offering a terminal emulation software product bundled with an industrial PC workstation product to address the terminal replacement market. However, the combined cost of emulation software and the PC workstation product was significantly more in cost than the terminal product. At this point in time, terminals were still being manufactured, and the emulation software could not generate the equivalent gross revenue, so the emulation solution remained in the background. Leaping forward to 2001 till today, the Intecolor terminal emulation software (ITE8001) is marketed as a software only product and also bundled with a variety of low cost, highly reliable industrialized PC based computers. Terminals Destined For Obsolesce By 1992, Intecolor partnered with several OEM companies to build custom color monitor products and rack mount computer products. A PC-based "workstation" product line referred to the "WS" series was created as a combination of an Intecolor monitor with PC compatible hardware. At the same time, custom color monitor products were being made for Allen-Bradley, Honeywell, Westinghouse, and Bailey Controls (now ABB). The classic product lines including the 8001, 8800, 3800, ColorTrend, AGS, and numerous other terminal models were rapidly discontinued due to accelerating product obsolescence. By mid 1993, these product lines were no longer in production. Custom engineering of PC based computers and further broadening of color monitor designs became Intecolor's new product line direction. Peripheral Exchange Provides Intecolor Product Services In July 1993, the classic Intecolor product line had come to an end. The major thrust had become primarily based on color monitor technology (CRT based), along with industrialized PC-based products, and the beginnings of TFT LCD flat panel display product offerings. Intecolor was positioning itself to manufacture newer product designs to stay ahead of a growing number of competitors. As a result, support for the classic product lines was left behind and became non-existent at best. Peripheral Exchange, (PE) was formed at this time as a service company to continue the service and support of Intecolor classic products for OEM's and the end-user customer base. Rockwell Automation Buys Intecolor For Cash In May 1996, Rockwell Automation completed a total cash buyout of Intecolor Corporation for an undisclosed amount, but was rumored to be about $27 million dollars. Upon this acquisition, Intecolor became a wholly-owned subsidiary of Rockwell Automation and took on the name "Intecolor/Rockwell Automation". Rockwell Automation needed a small company like Intecolor, to fulfill their need for color CRT monitors, TFT LCD flat panel displays, and industrialized PC products for their Allen-Bradley division. As part of the purchasing arrangement, the top Intecolor management agreed to stay intact for a specified term (around 4 years) to keep the new acquisition running smoothly. Meanwhile, Rockwell management bolstered it's management team presence within the Intecolor offices in Duluth, Georgia. By 2001 (or slightly earlier), the entire original Intecolor management team had been retired or replaced. Changes in Business Activity By 1998, Intecolor/Rockwell Automation had discontinued repair and support services on the classic terminal product lines. Repair and support services continued on color monitor products, PC based workstations, and flat-panel monitors. By Fall 2000, Intecolor/Rockwell Automation had ceased production of CRT-based monitors altogether. A stockpile of CRT monitors were built and warehoused as the last production run took place. All efforts were placed on industrialized color TFT LCD flat panel display systems. The ever decreasing cost of flat panel technology and market research showed that flat panel products were the new display technology of choice. The sales of CRT-based products were on a steep decline. Say Goodbye to Intecolor as a Name Brand By 2001, Rockwell Automation decided to dismantle and cease the use of the Intecolor brand product and product name. Effectively the name Intecolor would disappear from the marketplace. The Intecolor flat panel products would continue to be manufactured and sold under the Allen-Bradley name and marketed through AB distribution channels. On September 25, 2001, the Intecolor corporate web site described Rockwell's management decision to close facilities in Duluth, Georgia, and encouraged customers to contact Allen-Bradley's new support facilities. Over 200 Intecolor employees, (many having 15 to 25 years experience), lost their jobs as part of the shut down process. For all practical purposes, the support of the original Intecolor product ceased to exist as did the wealth of technical knowledge. Although, the AB site offers support for "all" Intecolor products, it is strongly advised to contact Peripheral Exchange for product support. The Intecolor/Rockwell Automation operations in Duluth, Georgia closed it's operations in October 2001. A needle roller bearing manufacturer now occupies this location. Who Services Intecolor Terminal Products Today? Peripheral Exchange (PE) acquired the inventory of several Intecolor service centers throughout the 1990's. In addition, a significant amount of Intecolor/Rockwell Automation's inventory was purchased prior to the Duluth Georgia factory closing in 2001. By specializing primarily on Intecolor brand repairs and refurbishments, many other multi-line service providers use our company on a subcontractor basis. We are dedicated to provide service and support of Intecolor products as a service arm to former OEM's and the end-user customer base.

14 years, 3 months

First commercially available color RASTER graphics terminal?

by legalize＠xmission.com

I saw something on someone's web site the other day claiming that the Tektronix 4027 was the first commercially available color raster graphics terminal. The 4027 first appears in the 1979 Tektronix catalog. I know there were vector based systems that were displaying color before that, but the question here is about raster based systems (i.e. pixel, not vector based). So the question becomes: was anyone else selling a raster color graphics terminal before Tektronix in 1979? -- "The Direct3D Graphics Pipeline" -- DirectX 9 version available for download <http://legalizeadulthood.wordpress.com/the-direct3d-graphics-pipeline/> Legalize Adulthood! <http://legalizeadulthood.wordpress.com>

14 years, 3 months

early raster display systems

by aek＠bitsavers.org

Bob said: Data Disc made a large graphics system meant to connect to mainframes around 1972. -- Data Disc goes back well into the 60's with video disk display systems. Hazeltine is even earlier. Disks and drums were used as frame stores along with recirculating magnetorestrictive delay lines in the days before semiconductor shift register memories. RAM replaced the shift registers in the 70's. But this all is getting well off the subject of raster display terminals. There were lots and lots of people making expensive frame stores (Ramtek, Genesco, etc.) Not so many were making things small/cheap enough to be used as terminals. Ramtek and others (trying to remember when Chromerics started) eventually got into that business. PCs and Workstations wiped out the graphics terminal market by the early 80's. Was interesting to find out ISC goes back to 1973.

14 years, 3 months

ROI BSB-11 Card for PDP11?

by holm＠freibergnet.de

Hi, I got an PDP11 board, labeled BSB11 from ROI. There are some diag LEDsi for Power and some BUS Signals, something that looks like an connector for an front paneel, an hughe field of soldering points for placing own circuits, an 5.0688Mhz Crytal oscillator, an GAL, and some 74xx ICs on board. Does someone know what that circuity on the board should do? Regards, Holm -- Technik Service u. Handel Tiffe, www.tsht.de, Holm Tiffe, Freiberger Stra?e 42, 09600 Obersch?na, USt-Id: DE253710583 www.tsht.de, info at tsht.de, Fax +49 3731 74200, Mobil: 0172 8790 741

14 years, 3 months

IBM 360/30 on display in Terrassa (Barcelona)

by ljw-cctech＠ljw.me.uk

Anyone wanting to see an IBM 360 Model 30, and not able to get to the CHM, can see the one on display at the Science and Technology Museum in Terrassa (immediately west of Barcelona.) This links shows what is on display, and where they came from: http://ordinadors.mnactec.cat/ibm-system360.html This is the exhibition catalogue: http://issuu.com/mnactec/docs/dossier-premsa-expo-historia-ordinador?mode=w… (Note - in Spanish, and Google translate doesn't help much with the first link, but you can work most of it out.) After a bit of a gap I have been busy on my 360/30 project, working on the 1050 (console typewriter) interface so that programs can have a sensible way of doing input and output (via a serial port.) -- Lawrence Wilkinson lawrence at ljw.me.uk The IBM 360/30 page http://www.ljw.me.uk/ibm360

14 years, 3 months

Assistance in reading old Tapes needing

by oe5ewl＠gmail.com

Hi all, I'd need assistance (hardware or actually reading in the tape) in reading some old 1600bpi PDP11 Tapes - containing an old operating System. If you can help, I'd appreciate if you contact me off list. Regards, Wolfgang PS: I have a tape drive but the unit is completely dead. Two local contacts which had working drives told me a sad story: Drives decomissioned, scrapped etc...... -- Wolfgang Eichberger - OE5EWL Operating System Collector Blog: 5ewl.blogspot.com Homepage: www.eichberger.org

14 years, 3 months

SuperBrain Disks

by dave12＠dunfield.com

Hi everybody, I've had delivery turned off for a long time - seems I'm no longer subscribed as my password does not work ... hopefully this will make it to the list, however I will not receive replies sent to the list except by checking the archives (which I don't do very often). I checked the archives today to see if a chap I had directed to the list got help with SuperBrain disks. I see several comments that I "should have them". I've never been able to read the diskettes from my original SuperBrain. I can read the first two tracks, then errors on every track - missing address marks. I cannot read them with ImageDisk nor TeleDisk. I've tried multiple different drives and types of drives - I simply cannot read the SuperBrain disks on anything except the SuperBrain. Every so often this comes up, and several people say "but SuperBrain disks are bog standard and easy to read" - so apparently I am the only one on the planet who can't read them. After explaining the above (that I simply cannot read them, and that I have in fact tried really hard) - I always get several offers to send me images or disks that can be read ... but nobody has every followed through, which is why I do not have SuperBrain disks on my site. I do have another system called a "CompuStar" which is a rebadged SuperBrain - and most of the disk from that system ARE readable on a PC ... BUT... the guy who owned it really liked APL, and created his own character generator ROM and custom BIOS to support APL characters on the machine ... All of his disks are "hand made" (not originals) and although his disks boot, they display incomprehensible garbage on a normal SuperBrain. Therefore I see little point in posting them as SuperBrain disks. I've only found one disk from his collection which boots and displays on the normal Brain - and it has the missing address mark problem. I've tried booting the Compustar disks on the SuperBrain and blind- formatting a disk --- but the created disk is still unreadable. I am assuming that the Z80 based disk controller in my SuperBrain makes disks which are not readable on a PC (the SB reads them fine). It can boot and read the CompuStar disks, however it does not appear to be able to format a readable disk. Unfortunately the Compustar is not currently working, and will need significant work to repair - so I cannot try formatting disks on it. And I am unable to create anything on the SuperBrain which I can read on the PC. Which is why I cannot provide disk images for the SuperBrain. I've tried - I simply cannot make it happen. Dave -- dave12 (at) Dave Dunfield dunfield Firmware development services & tools: www.dunfield.com (dot) com Classic computers: http://www.classiccmp.org/dunfield/

14 years, 3 months

C compilers and non-ASCII systems

by spc＠conman.org

A friend recently raised an issue with some code I wrote (a hex dump routine) saying it depended upon ASCII and thus, would break on non-ASCII based systems (and proposed a solution, but that's beside the issue here). I wrote back, saying the code in question was non-portable to begin with (since it depended upon read() and write()---it was targetted at Posix based systems) and besides, I've never encountered a non-ASCII system in the nearly 30 years I've been using computers. So now I'm wondering---besides Baudot, 6-bit BCD and EBCDIC, is there any other encoding scheme used? And of Baudot, 6-bit BCD and EBCDIC, are there any systems using those encoding schemes *AND* have a C compiler available? -spc (Or can I safely assume ASCII and derivatives these days?)

14 years, 3 months

mail client evilness, was Re: architectural diversity, gcc - Re: C compilers and non-ASCII systems

by cctech＠beyondthepale.ie

> The problem with format=flowed, is that it just doesn't work well with > older mail clients. It doesn't work particularly well for anyone reading the mailing list archive via the web interface either. However, I can't tell whether the correct header is present or not in the affected messages as the web interface does not reveal the headers. (It works fine if reading messages in VMS mail, until an attempt to reply is made and everything turns out to be on one line...) Regards, Peter Coghlan.

14 years, 3 months

Apple II SPI

by brain＠jbrain.com

Barring implementation of 65SPI on a CPLD, is there a quick-n-dirty way to wire up a SPI-based module to an Apple II/II+/IIe? I'm looking for a temp solution, while I design a Apple II board with a correct interface. Something that doesn't require any soldering would be grand (bit banging the SPI via some IO pins, Using the DSR/DTR/RTS pins on the RS232 (if that can be done...), etc. Jim -- Jim Brain brain at jbrain.com www.jbrain.com

14 years, 3 months

Commordore 64 character color cycling

by tpresence＠hotmail.com

>> I'm not familiar with BG Micro (yet), but I know Unicorn has a hefty >> minimum, which Jameco does not (while you're there, though, you might as >> well pick up the socket as well and maybe some spare parts (like more >> 6502s). >Not long ago, Jameco had commodore PLAs for a song (something like a >dollar or less). I know a brazilian that bought 50 :o) >But remembering - You can put a 27C512 EPROM with a special bin in place >of a PLA! Google is your (best) friend! :D Any idea what part number you saw for the PLAs from Jameco? Although I have all the other ICs I need, I don't have a properly programmed N82S100. I am going to buy the sockets there anyway...I really wouldn't mind buying a programmer, especially if I could get a USB model that was reliable (the sparkfun model I saw did not rate well, but its $50).Is there a programmer that is less than $100 and will do the job?Kevin

14 years, 3 months

Imaging OSI disks

by dm561＠torfree.net

A question for Chuck, Fred and anyone else with relevant experience/knowledge: can OSI disks (specifically Challenger 4P disks) be read by a PC and imaged/recreated ? If so, how? If not, why not? Don't see 'em in either 22disk or Xenocopy, but then they're not CP/M. It's a question from a third party and I don't have any disks or I'd try some imaging programs myself. TIA, m

14 years, 3 months

Wanted: Parallel DB25 Microswitch ASCII Keyboard

by nick.allen＠comcast.net

Anyone have a Parallel Microswitch ASCII Keyboard they are willing to part with?

14 years, 3 months

OT: HP signature analyzer

by mcguire＠neurotica.com

Hey folks. I have a short-term need for an HP signature analyzer. I don't need one of these very often, so I'm not really keen on buying one. (I know...those here who have seen my lab may be astonished to learn that there's a piece of test equipment that I do not have...but this particular one is rather boring, and not one of HP's better ideas) Does anyone in the US have one that I'd be able to borrow for a few days? Thanks, -Dave -- Dave McGuire New Kensington, PA

14 years, 3 months

68000 CPUs available + others (MAC, multiplier)

by legalize＠xmission.com

A local guy Abraham Barker has some 68000 chips for sale: 68000 16/32-bit CISC microprocessor: 1x MC68000P8 (Motorola Plastic...) 2x MC68000L8 (Motorola Ceramic) 1x MC68000P10 (Motorola Plastic) 3x MC68000L10 (Motorola Ceramic) 4x MC68000L12 (Motorola Ceramic) 1x SCN68000 CAI64 B (Signetics Ceramic gold plated leads) 16x16 Parallel Multiplier-Accumulator: 1x TDC 1010J (TRW Ceramic/Aluminium gold plated) 3x 1010J1C (TRW Ceramic/Aluminium gold plated) 2x WLT1010 JC (Weitek Ceramic gold plated) 16x16 Parallel Multiplier: 1x MPY 016H (TRW Ceramic/Aluminium gold plated) 1x 016HJ1C (TRW Ceramic/Aluminium gold plated) He didn't post what he was asking for them, but I will pass it along when I know. He was going to list them on ebay in a few days, but I thought someone here might be interested in a first crack. Email me and I will forward any messages to him and he can reply to you directly. -- "The Direct3D Graphics Pipeline" -- DirectX 9 version available for download <http://legalizeadulthood.wordpress.com/the-direct3d-graphics-pipeline/> Legalize Adulthood! <http://legalizeadulthood.wordpress.com>

14 years, 3 months

cobalt qube

by dgriffi＠cs.csubak.edu

It might not be THAT old, but it certainly is a cute little oddity. I'm thinking that maybe HP used the Cobalt Qube for inspiration for the new Proliant Microserver. Though... needs an LCD panel with buttons. -- David Griffith dgriffi at cs.csubak.edu A: Because it fouls the order in which people normally read text. Q: Why is top-posting such a bad thing? A: Top-posting. Q: What is the most annoying thing in e-mail?

14 years, 3 months

Debugging CRT monitors (Philips CM8833 Mk2 / Acorn AKF17)

by cctech＠beyondthepale.ie

> >With anything over about ten years you start by replacing electrolytic >capacitors. If you want to test instead of shotgun then pick up an ESR >meter, but it usually shows more than a few are failing. If the monitor >is over twenty years old, then just replace all the electrolytics and >then troubleshoot - it there is still a problem that is. > I don't think I've got anything less than ten years old. I can't remember having cause to replace more than an occasional electrolytic here and there except in the case of a television from the 1970's which has required about five or six over years of heavy use. I'm sure if I checked everything with an ESR meter it would show up a bunch that are below par. However, many applications for electrolytic capacitors can tolerate very large variations and they may well have years of usable life left in them even though the meter condemns them. There may be a case for checking critical capacitors in power supplies etc which may be at risk of overheating or leaking, however there is no reason to check every electrolytic. I think replacing large numbers of electrolytics is likely to be be more trouble than it is worth and may even introduce new problems that weren't there before, particularly on old pcbs where the print was never well stuck to the board, even when new. Far better to look for a schematic if available and wade in with the scope looking for the problem with deductive reasoning. > >Do take care to match the caps to the job they do - low ESR caps for the >horizontal, and caps that handle AC ripple for the linear power supplies. > I will agree there. Regards, Peter Coghlan.

14 years, 3 months

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