- test-drb@ccmp.vtda.org - classiccmp.org

by sales＠elecplus.com

http://en.wikipedia.org/wiki/IBM_PC_Convertible If it is supposed to look like this, then mine is missing the keyboard, floppy drives, and prob a few other things. There is a 256K memory card in it. Cindy Croxton Electronics Plus 1613 Water Street Kerrville, TX 78028 (830)792-3400 phone (830)792-3404 fax AOL IM elcpls _____ No virus found in this message. Checked by AVG - www.avg.com Version: 2013.0.3392 / Virus Database: 3211/6589 - Release Date: 08/19/13

12 years, 10 months

3
3
0 0

old laptops from 286 on up

by sales＠elecplus.com

The majority of the laptops have been shipped off. I saved some I thought were worth keeping. Dell from 286 thru 486, complete, good screens, prob missing hard drives. Compaq from SLT286 thru P1, complete, good screens, prob missing hard drives. Toshiba Satellite, old series, complete, good screens, prob missing hard drives. IBM from 286 on up, good screens, some have hdd. AC adapters are avail for most models. If you want some of these, please message me off line. Sorry I don't want to trade, but I have 10K sq feet of old stuff here J Cindy Croxton _____ No virus found in this message. Checked by AVG - www.avg.com Version: 2013.0.3392 / Virus Database: 3211/6589 - Release Date: 08/19/13

12 years, 10 months

1
0
0 0

No subject

by tosteve＠yahoo.com

http://bitpig.com/temp/apple-iigs-manuals.jpg

12 years, 10 months

1
0
0 0

Update -- IBM S/34 Must Go

by chd＠chdickman.com

On Sat, Jul 13, 2013 at 10:27 AM, Charles Dickman <chd at chdickman.com> wrote: > I need to rid myself of an IBM S/34, (4) 5250 terminals and a printer that > I have. I sold the house that it is stored at and closing is in 30 days. > One way or another it must go. > > Pictures: http://www.chdickman.com/IBM/ > > The documentation is spoken for, but the hardware is available to anyone > that wants to come and get it (Ohio, USA 45865). The thought of breaking it > for scrap does not appeal to me all. > > Its gone. All 1300 lb of it. A recycler gave me steel scrap price for it, about $75. I'll get in touch with a couple of you regarding some of the items that I kept. -chuck

12 years, 10 months

2
1
0 0

DEC LCG- KA, KI, KL etc

by useddec＠gmail.com

Does anyone have or know of any available anywhere? Thanks, Paul

12 years, 10 months

24
40
0 0

HP 98203 keyboard "knob" debugging

by derschjo＠gmail.com

Thanks to a tip froma list member, I managed to snag a compatible keyboard for my HP 9816 -- a "Nimitz" class keyboard, the 98203B(http://www.hpmuseum.net/display_item.php?hw=682). It works fine (though it dwarfs the machine it's connected to) except that the "knob" in the upper-left does not appear to function. I've looked for service manuals but I can't find anythingthat's particularly detailed. I've partially disassembled the knob unit-- there's a glass/ceramic disc with radial markings, and with what appearsto be an incandescent bulb on one side and a pair of sensors on the other. The bulb does not appear to be illuminating when powered up (it does seem to be getting 5V),so this seems suspect but I don't know whether it's supposed to be emitting visible light or not. I also don't know what to replace it with. Anyone repaired one of these before? I'm guessing Tony'll havesome input here :). Thanksas always, Josh

12 years, 10 months

3
4
0 0

IBM 5140 PC Convertible pics

by sales＠elecplus.com

https://plus.google.com/photos/106111250846948401252/albums/5913905172430530 721?banner=pwa Not exactly complete! Anybody want it? If not, going to scrap. Cindy Croxton _____ No virus found in this message. Checked by AVG - www.avg.com Version: 2013.0.3392 / Virus Database: 3211/6589 - Release Date: 08/19/13

12 years, 10 months

1
0
0 0

strange OLD IBM PC Convertible

by sales＠elecplus.com

One of the "laptops" that came in this batch is an IBM PC Convertible. It is in pieces, but looks repairable. The very back piece on the top is missing. There is a slender carrying handle. The model number on the bottom is 5140. There are what looks like 2 each 5.25" floppy connectors, but no hdd connector at all. There are NO drives in the unit. Apparently there was a modem at one time, since there is a modem sticker on the bottom. I can post pics, if needed. If somebody wants this thing, email me off list with offers. About 5 pounds UPS ground shipping. Cindy Croxton Electronics Plus 1613 Water Street Kerrville, TX 78028 (830)792-3400 phone (830)792-3404 fax AOL IM elcpls _____ No virus found in this message. Checked by AVG - www.avg.com Version: 2013.0.3392 / Virus Database: 3211/6589 - Release Date: 08/19/13

12 years, 10 months

1
0
0 0

IBM 701C laptops are SOLD

by sales＠elecplus.com

Sorry folks, already claimed. Cindy Croxton _____ No virus found in this message. Checked by AVG - www.avg.com Version: 2013.0.3392 / Virus Database: 3211/6587 - Release Date: 08/18/13

12 years, 10 months

1
0
0 0

IBM laptop 701C butterfly kbd

by sales＠elecplus.com

So far 2 laptops, 1 boots, the other does not. Still sorting 16,000 pounds of laptops.. Cindy Croxton _____ No virus found in this message. Checked by AVG - www.avg.com Version: 2013.0.3392 / Virus Database: 3211/6585 - Release Date: 08/17/13

12 years, 10 months

2
2
0 0

Tektronix analyzers

by sales＠elecplus.com

Not affiliated with this seller, please contact them directly if you want the equipment. We're looking to sell three Tektronix Spectrum analyzers that we recently received. Items are in good condition and power one without issue. We received them from a known working environment. Models are Tektronix 2782, Tektronix 494AP Programmable Spectrum Analyzer and Tektronix AM700 Audio Measurement Set. If interested, please email me at techsales at pcretro.com with your offers. Can supply photos. _____ No virus found in this message. Checked by AVG - www.avg.com Version: 2013.0.3392 / Virus Database: 3211/6587 - Release Date: 08/18/13

12 years, 10 months

1
0
0 0

Looking for Axil 320 material

by aperry＠snowmoose.com

I added an Axil 320 to the collection yesterday. It had been sitting at the local computer recycler for months, so I finally made make an offer. It is a Sun SPARCstation 20 clone. It has two M61 processor modules and 512M of memory. It doesn't have a frame buffer, so I am running it headless (using a 90s vintage Mac laptop as the serial console) until the CG6 that I ordered arrives. Does anyone have any material on Axil or the 320 model? Not much is coming up searching the web. alan P.S. An old Wang system has been at the recycler for even longer than the Axil, if anyone is interested. And a large (like the size of my 11/750) IBM tractor feed printer has shown up since my previous visit.

12 years, 10 months

1
0
0 0

cctalk Digest, Vol 120, Issue 25

by saquinn624＠aol.com

Josh writes: >I've partially disassembled the knob unit-- there's a glass/ceramic disc >with radial markings, and with what appears to be an incandescent bulb on >one side and a pair of sensors on the other. The bulb does not appear to >be illuminating when powered up (it does seem to be getting 5V),so this >seems suspect but I don't know whether it's supposed to be emitting >visible light or not. I also don't know what to replace it with. > >Anyone repaired one of these before? > >I'm guessing Tony'll havesome input here :). > >Thanksas always, >Josh I haven't repaired (or even seen) one, but the limiting factor will be what the sensors can detect. If you can get a part number you can look them up and see if you can get a LED that will emit light of a detectable wavelength.

12 years, 10 months

1
0
0 0

FREE: Cromemco manuals and floppy disks

by tosteve＠yahoo.com

Yours for the price of shipping (located in southern California 92656): Cromemco Manuals: 1. CDOS - Disk Operating System 2. ZPU Central Processing Unit 3. Text Editor 4. Screen Editor 5. LISP 6. COBOL Addendum 7. Z80A Central Processing Unit ?8-inch floppy disks - working status unknown: 1. CP/M Source 2. CDOS Operation System (1982) 3. COBOL (1979) http://bitpig.com/temp/cromemco-manuals.jpg http://bitpig.com/temp/cromemco-disks.jpg

12 years, 10 months

3
2
0 0

FREE: Cromemco manuals and floppy disks

by tosteve＠yahoo.com

Yours for the price of shipping: Cromemco manuals: 1. CDOS - Disk Operating System 2. ZPU Central Processing Unit 3. Text Editor 4. Screen Editor 5. LISP 6. COBOL Addendum 7. Z80A Central Processing Unit ?8-incg floppy disks - working status unknown: 1. CP/M Source 2. CDOS Disk Operation System 3. bitpig.com/temp/cromemco-manuals.jpg http://bitpig.com/temp/cromemco-disks.jpg

12 years, 10 months

1
0
0 0

Wanted: TI microExplorer parts

by turing＠shaw.ca

I'm looking for a TI microExplorer main board, as mine died recently. [There was a dannydz in Vancouver who posted a few years ago about having one, but his e-mail no longer works, of course...] -- Norman Jaffe

12 years, 10 months

1
0
0 0

Intel Intellec 4 MOD 40

by j＠ckrubin.us

Dave Larsen has one of these in his BugBook museum. No idea of the machine status or if Dave has the ability to dump the ROMs. Contact him through http://bugbookmuseum.blogspot.com/ Jack

12 years, 10 months

2
1
0 0

A Layman's Guide to Write Precompensation

by philpem＠philpem.me.uk

Hi there, I think I've got the write precompensation stuff figured out (finally!) :) Back in 1983, Control Data (via their Magnetic Peripherals Inc. subsidiary) released an application note called "PLO and Write Precompensation for 5.25-inch FDDs". This has since been scanned and uploaded to Bitsavers (thanks again, Al!): <http://www.bitsavers.org/pdf/cdc/discs/floppy/77653447_5inchPrecomp_Aug83.p…> The interesting stuff starts on PDF page 31 ("real" page 28). There's a really good explanation of why peak shift occurs and why precompensation is needed. This includes diagrams of problematic bit patterns (both the original data bits and the MFM-encoded transitions) and shows which bit needs shifting. These patterns are: x011 x110 1000 0001 Which encode to MFM as: Input MFM coded Shifts Correction ----- --------- ------ ---------- x011 --> xx00101x --> Early --> Delay 250ns 1000 --> 01001010 --> Early --> Delay 250ns x110 --> xx10100x --> Late --> Advance 250ns 0001 --> 10101001 --> Late --> Advance 250ns * "Input" is the data before MFM encoding "MFM coded" is after MFM encoding has been applied "Shifts" is the direction in which peakshift will shift the transition The asterisk denotes the transition which must be shifted If you're working on raw bits, that's fine -- and indeed, this matches up perfectly with what's in the Western Digital FD179x-01 application notes (Figure 6: "Internal Write Precomp Algorithm") and Jean Louis-Guerin's WD1772 documentation. But what if we choose to feed the data to an MFM encoder (which converts every bit into two bits) and then process the output of that in a bit-serial manner? Well, in that case, we only need to match two bit patterns: 00101 --> Early --> Delay 250ns 10100 --> Late --> Advance 250ns * And thus this precompensation code was born: uint8_t shiftreg = 0; int n = 0; for (vector<bool>::iterator bit = bits.begin(); bit != bits.end(); bit++) { shiftreg = ((shiftreg << 1) | (*bit ? 1 : 0)); // The shift register delays the output by 2 bits if (n < 2) { n++; continue; } switch (shiftreg & 0x1F) { case 0x05: // 00101 (MFM x011 or 1000) - causes early shift printf("Early Shifted %d\n", shiftreg&4?1:0); break; case 0x14: // 10100 (MFM x110 or 0001) - causes late shift printf("Late Shifted %d\n", shiftreg&4?1:0); break; default: printf("Normal %d\n", shiftreg&4?1:0); break; } } Typical precompensation for 5.25-inch floppies, by the way, is 250 nanoseconds. I'm not sure what it is for 3.5-inch, or indeed for other data rates (if data rate has a bearing on peak shift). Enjoy! -- Phil. philpem at philpem.me.uk http://www.philpem.me.uk/

12 years, 10 months

2
1
0 0

RL01/02 unit ID plugs

by roe＠liveblockauctions.com

I'm in need of unit id plugs 2 and 3 for RL01/02 disk drives, does anyone have spares they would part with?

12 years, 10 months

2
2
0 0

Reviving a Compaq Deskpro/286

by jules.richardson99＠gmail.com

I picked up a Deskpro/286 the other day. It passes POST, and the hard disk (an IBM 0665 30MB F/H ST-412 unit) spins up and makes encouraging noises, but then it stops (after apparently trying to boot via floppy) with a "non system disk or disk error" message. IIRC, there's a setup utility on the Compaq DOS disks - does this include configuration of the hard disk? I wonder if the system's simply lost NVRAM settings and so the disk controller is trying to talk to the drive using the wrong geometry (although of course it could just as easily be a faulty or formatted drive). There's no obvious manufacturer of the combined floppy/hard disk controller board, but it's perhaps reasonable to assume that it's whatever was originally shipped with the system. If I do need the Compaq DOS floppies, does anyone have images available (3.5" preferred, but I think I have some spare 5.25" HD floppies and could put the Compaq's drive into my desktop PC temporarily to write them) thanks Jules

12 years, 10 months

4
11
0 0

Hackspace open day

by lproven＠gmail.com

List members in that vicinity, of a soldering-iron-wielding disposition, might be interested to know that tomorrow is Open Day at London Hackspace. http://wiki.london.hackspace.org.uk/view/2013_August_Open_Day -- Liam Proven ? Profile: http://lproven.livejournal.com/profile Email: lproven at cix.co.uk ? GMail/G+/Twitter/Flickr/Facebook: lproven MSN: lproven at hotmail.com ? Skype/AIM/Yahoo/LinkedIn: liamproven Tel: +44 20-8685-0498 ? Cell: +44 7939-087884

12 years, 10 months

1
0
0 0

Openstep on intel

by slandon110＠gmail.com

I've been able to successfully install openstep 4.2 on a dell gx110 by adding a matrox millennium II, 3C905b-tx for Ethernet and a soundblaster 16 pci. So with those 3 cards you should be able to install openstep 4.2 on any old pc. It supports up to 512mb ram and is super super fast. Compiling is crazy fast. So if you want to mess with openstep/ nextstep on the cheap this is the way to do it. I've also had it running on numerous thinkpads. A 570E 380ed and a 760 Ed. Sent from my iPhone

12 years, 10 months

4
4
0 0

A Layman's Guide to Write Precompensation

by classiccmp＠philpem.me.uk

Hi there, I think I've got the write precompensation stuff figured out (finally!) Back in 1983, Control Data (via their Magnetic Peripherals Inc. subsidiary) released an application note called "PLO and Write Precompensation for 5.25-inch FDDs". This has since been scanned and uploaded to Bitsavers (thanks again, Al!): <http://www.bitsavers.org/pdf/cdc/discs/floppy/77653447_5inchPrecomp_Aug83.p…> The interesting stuff starts on PDF page 31 ("real" page 28). There's a really good explanation of why peak shift occurs and why precompensation is needed. This includes diagrams of problematic bit patterns (both the original data bits and the MFM-encoded transitions) and shows which bit needs shifting. These patterns are: x011 x110 1000 0001 Which encode to MFM as: Input MFM coded Shifts Correction ----- --------- ------ ---------- x011 --> xx00101x --> Early --> Delay 250ns 1000 --> 01001010 --> Early --> Delay 250ns x110 --> xx10100x --> Late --> Advance 250ns 0001 --> 10101001 --> Late --> Advance 250ns * "Input" is the data before MFM encoding "MFM coded" is after MFM encoding has been applied "Shifts" is the direction in which peakshift will shift the transition The asterisk denotes the transition which must be shifted If you're working on raw bits, that's fine -- and indeed, this matches up perfectly with what's in the Western Digital FD179x-01 application notes (Figure 6: "Internal Write Precomp Algorithm") and Jean Louis-Guerin's WD1772 documentation. But what if we choose to feed the data to an MFM encoder (which converts every bit into two bits) and then process the output of that in a bit-serial manner? Well, in that case, we only need to match two bit patterns: 00101 --> Early --> Delay 250ns 10100 --> Late --> Advance 250ns * And thus this precompensation code was born: uint8_t shiftreg = 0; int n = 0; for (vector<bool>::iterator bit = bits.begin(); bit != bits.end(); bit++) { shiftreg = ((shiftreg << 1) | (*bit ? 1 : 0)); // The shift register delays the output by 2 bits if (n < 2) { n++; continue; } switch (shiftreg & 0x1F) { case 0x05: // 00101 (MFM x011 or 1000) - causes early shift printf("Early Shifted %d\n", shiftreg&4?1:0); break; case 0x14: // 10100 (MFM x110 or 0001) - causes late shift printf("Late Shifted %d\n", shiftreg&4?1:0); break; default: printf("Normal %d\n", shiftreg&4?1:0); break; } } Typical precompensation for 5.25-inch floppies, by the way, is 250 nanoseconds. I'm not sure what it is for 3.5-inch, or indeed for other data rates (if data rate has a bearing on peak shift). Enjoy! -- Phil. classiccmp at philpem.me.uk http://www.philpem.me.uk/

12 years, 10 months

1
0
0 0

IBM binder

by BHuntsman＠mail2.cu-portland.edu

Random question of the day: I recently acquired a brand-new, shrinkwrapped copy of the System/370 Principles of Operation. Unfortunately it was sans binder. Anyone have an appropriate-era genuine IBM 3-ring binder they'd be willing to sell me? Thanks in advance! -Ben

12 years, 10 months

1
0
0 0

Intel Intellec 4 MOD 40 ROMs

by kylevowen＠gmail.com

Hi all, Who else owns one of these development systems? Herb Johnson and I have been dumping the ROMs of our two systems, only to discover a lot of partial (and one total) erasure of our 1702As. My ROMs have lacked a sticker over the window since it left the Intel factory, but only one of them is completely erased, or perhaps it's defective. But there are many other inconsistencies in our ROMs, hinting at possible partial erasure over time. Herb has been writing up some of our discussion and findings here: http://www.retrotechnology.com/restore/intl4_roms.html It would be great to get some others with these systems to dump the ROMs. The listing for the monitor for the 8 MOD 80 is available, if I recall, but not for the 4 MOD 40. It's only a 2kB monitor, so it would be very limited on what it could do. My guess is that it could talk with a teletype and do some basic reading of paper tape into RAM. One thing to note is that the entire asynchronous translation is done without a UART! The 4040 decodes it directly by reading and writing from two pins on two different ports for keyboard and printer, and a third pin on a third port for reader run. That certainly takes some software to control. If anyone could help Herb and I out, we would appreciate it greatly. Kyle W4GNU

12 years, 10 months

4
3
0 0

DEC LCG- KA, KI, KL etc

by bqt＠update.uu.se

On 2013-08-15 19:00, Ian King<IanK at LivingComputerMuseum.org> wrote: > On 8/12/13 10:05 PM, "Eric Smith"<spacewar at gmail.com> wrote: > >> >On Aug 12, 2013 9:22 PM, "Paul Anderson"<useddec at gmail.com> wrote: >>> >>Does anyone have or know of any available anywhere? >> > >> >The only intact KA and KI processors known to exist have recently been >> >accessioned by the Living Computer Museum in Seattle. It's perhaps not >> >impossible that another one might be out there somewhere, but if so, it >> >will be difficult to find, and even more difficult to pry loose. >> > >> >Eric >> > >> > > We have a KI and multiple KLs and KSs. We really want a KA, too.:-) -- Well, I know of at least one more KA, which is fully functional. But it's not likely to be handed out. The same person have one of ever type of PDP-10 built (with the exception of the PDP-6 and F-1, I think, and all more or less functional). Pontus Pihlgren<pontus at Update.UU.SE> wrote: > On Thu, Aug 15, 2013 at 04:12:31AM +0000, Ian King wrote: >> >We have a KI and multiple KLs and KSs. We really want a KA, too.:-) -- > How many KA was made? I think it was a couple of hundred? But I might be misremembering. I think the information is available online somewhere. Johnny

12 years, 10 months

2
1
0 0

looking for a macro-11 disassembler

by bqt＠update.uu.se

On 2013-08-15 19:00, "E. Groenenberg"<quapla at xs4all.nl> wrote: > Hello. > > I need some help, as I'm struggling with some pieces of old > code of which I have only the macro-11 object files of. > > So, I'm looking for a disassembler which can read the .obj > file and create a .mac file from it. > I tried Google to find something, but alas, nothing to be found:( > > So, it there someone who has such a program? > > (BTW, I'm using RSX-11M V4 If you have access to DECUS tapes, you have both DOB and ORC which does what you are looking for. You should also be able to find them at ftp://ftp.update.uu.se/pub/pdp/rsx Johnny

12 years, 10 months

1
0
0 0

I7000 - a brazilian CP/M computer

by alexandre.tabajara＠gmail.com

http://tabajara-labs.blogspot.com.br/2013/08/alguem-conhece-o-i7000-da-itau… This is the brazilian I7000 CP/M computer. If I'm not mistaken, the first computer from Itautec. I'll dump the EPROMs and make it avaiable soon. --- Enviado do meu Motorola PT550 Meu site: http://www.tabalabs.com.br

12 years, 10 months

2
2
0 0

Giving away manual (MACRO/1000 Reference Manual)

by stephane.tsacas＠gmail.com

Hi, I found a copy of the MACRO/1000 Reference Manual RTE6/VM * RTE-XL * RET-A HP 1000 Computer Systems It seems to be an older version of http://www.hp.com/products1/rte/tech_support/documentation/documentation4/9… mine is dated August 1987 (second edition). If you want it, you pay shipping, from France (2Kg ~ 5.5 euros). -- Stephane FreeDonne <http://www.freedonne.org> Join FreeDonne - Rejoignez FreeDonne.

12 years, 10 months

1
0
0 0

the first photo, what is it?

by sales＠elecplus.com

http://www.ierrecycling.com/Photos.php What is the item that is shown in the first photo in the series? I have not seen anything like it before. Cindy Croxton Electronics Plus 1613 Water Street Kerrville, TX 78028 (830)792-3400 phone (830)792-3404 fax AOL IM elcpls _____ No virus found in this message. Checked by AVG - www.avg.com Version: 2013.0.3392 / Virus Database: 3211/6575 - Release Date: 08/13/13

12 years, 10 months

5
5
0 0

FREE: computer data cassettes. Also Macintosh floppy disks

by tosteve＠yahoo.com

Free for the cost of shipping: 1. Small pile of old computer cassette tapes, mostly TRS-80 Model I; some VIC-20, etc. Most have program names written on the label. Working status unknown. 2. About ten pounds (30 inches stacked up) of Macintosh floppy disks for all kinds of different Macs. Some original disks, many copies. Probably little to none early 128K, 512K, etc. systems. Located in southern California 92656. See here! http://bitpig.com/temp/tapes.jpg http://bitpig.com/temp/disks.jpg

12 years, 10 months

2
2
0 0

IBM 5160s available for local pickup only in MD until 8/20/13

by barythrin＠gmail.com

I'm reposting this for Bill since there hasn't been local interest in the last week. If you're local or near MD he's been trying to find a home for these but only has until 8/20/13. Yes we've tried to sweet talk him into shipping but he's been there and done that and is no longer interested in doing so. He can be reached on the vintage-computer.com forums. Here is his post: http://www.vintage-computer.com/vcforum/showthread.php?38549-Two-IBM-PC-XT-… "I have IBM 5160 XT's that have to go due to major downsizing. Pictures: http://www.wrljet.com/PCs/ The chassis and internal components of both are very clean. Some I have washed, some were new when installed. One cabinet is pretty good. One has some small rust spots. Both have 8087 math chips, and 640K on the motherboards. One motherboard came as a 640K, the other was 256K which I updated with bigger RAMs, added the missing mux chip, and changed the jumper. One has a single half height 360K floppy drive and working 20MB MFM hard disk. The other has two half height floppies and no hard drive. That one has a clone power supply. I think both have Mono cards, and one has a VGA. The mono and VGA don't co-exist all that politely. One has an Intel Above Board. And there's a Hercules graphics card in the box. FREE, LOCAL PICKUP ONLY in Bethesda MD USA (top of DC Beltway). These must be collected by Tuesday, 20 August to save them from the county metal/electronics recycling. Send me a private msg or email through the forum if interested. Bill " - John

12 years, 10 months

1
0
0 0

Sun 3/80 mobo wanted

by michael.99.thompson＠gmail.com

> > >> From: Kurt Nowak <knowak at alumni.calpoly.edu> > Date: Tue, 13 Aug 2013 11:53:46 -0700 > Subject: Sun 3/80 mobo wanted > By chance does anyone have a Sun 3/80 mainboard lying around. I fired mine > up after years and it no longer powers up. I first thought it was the PS, > but I replaced it with a known working one from an SS1 and it still was > dead. Any possible ideas would be appreciated. > > -Kurt > I bet that one of the tantalum caps on the motherboard shorted. It is a common failure mode. If you leave it powered on for a while you will find it. -- Michael Thompson

12 years, 10 months

3
2
0 0

cctalk Digest, Vol 120, Issue 20

by elson＠pico-systems.com

Date: Tue, 13 Aug 2013 19:53:50 -0500 From: Chris Elmquist <chrise at pobox.com> To: cctalk at classiccmp.org Subject: Re: KI front panel "VOLTAGE" adjust? Message-ID: <20130814005349.GG2148 at n0jcf.net> Content-Type: text/plain; charset=us-ascii OK. Thanks for all the input on the topic guys. It just struck me as interesting that they needed this adjustment on the front panel of the machine-- which implied that they needed to adjust it often. I guess it was a long forgotten art of making the machine easily servicable for their SEs :-) The IBM 360's (at least the mid-size and up) had voltage margin controls and a big meter on the front. Not adjusting mains voltage with a Variac, but there was a raise/lower knob and a power supply selector. The FE would run certain diagnostic loops while exercising the voltage margins. I believe the raise/lower knob ran motorized pots on the various power supplies in the back of the machine. Might have saved an hour over doing the whole procedure with a meter and screwdriver adjustment. I think that the raise/lower control was inactive unless the FE key was turned. Jon

12 years, 10 months

1
0
0 0

Looking for: 4K memory board for SWTPC 6800

by derschjo＠gmail.com

Hi all -- Subject line says it all; I have 12K in my 6800 and I'd love to get up to 16K so I can use the disk system to run FLEX. I know it's possible to modify the processor board to wire in up to 8K of memory, but I'd prefer to leave it alone if possible. Anyone have a board (MP-M, MP-8M, or anything compatible, really...)? Doesn't even have to work, just be serviceable :). Thanksas always, Josh

12 years, 10 months

1
0
0 0

FS: AMRAY 1610T SEM, 11/23-based EDS

by jfoust＠threedee.com

I need to dispose of the electronic microscope / spectrometer I acquired in 2001. <http://threedee.com/jmosn/microscopes/amray/index.html>http://threedee.com/jmosn/microscopes/amray/index.html http://www.labx.com/v2/adsearch/detail3.cfm?adnumb=498399 The PGT is PDP 11/23-based. If I can't find a "best offer" buyer for the entire package in the next few weeks, I'll scrap it for the metals but I'll find a classic-hearted home for the computer. Located in Jefferson, WI. - John

12 years, 10 months

2
1
0 0

Sun 3/80 mobo wanted

by knowak＠alumni.calpoly.edu

By chance does anyone have a Sun 3/80 mainboard lying around. I fired mine up after years and it no longer powers up. I first thought it was the PS, but I replaced it with a known working one from an SS1 and it still was dead. Any possible ideas would be appreciated. -Kurt

12 years, 10 months

1
0
0 0

Fixing a Micropolis 1375 drive?

by shadoooo＠gmail.com

I would add to my previous post that the operation of moving the bumper holder MUST be done with the disk at full rotating speed. In fact, this will move the head, that must fly on the disk surface. When done with halted disk, the head movement could cause severe damages. PS - BTW if somebody has a great amount of these disks to be repaired, I would be glad to have some for my DEC machines here. Andrea

12 years, 10 months

1
0
0 0

FS: Apple //c, //e and Mac Plus- All loaded tricked out systems

by slandon110＠gmail.com

Clearing out some more of my personal collection Nice Apple //c plus with original box, Monitor //c with stand and UniDisk 3.5 drive $150 dollars Can Deliver to VCFMW/ECCC if paid for in advance A loaded Mac Plus with 4MB RAM 20SC Hard Drive with 100MB Drive installed Apple CDSC CD-ROM Unit PowerUser Syquest 44mb drive with a ton of carts DaynaPort E/Z Ethernet Adapter for Mac Plus $150- Can deliver to VCFMW/ECCC if Paid for in advance Apple //e system CFFA 3000 Card Echo II Speech Synthesizer Card AppleTalk Workstation Card- Lets you connect your //e to AppleTalk Network DuoDisk 5.25 Drive Color Monitor //e Mouse Card with Mouse Taxan 64k RGB Monitor card, Use any RGB Monitor with the //e $400 dollars- Can Deliver to VCFMW/ECCC if Paid for in advance

12 years, 10 months

6
5
0 0

DEC RF74 fault light oddity

by binarydinosaurs＠gmail.com

Folks, I replaced a dead RF74 for a customer this morning and noticed the fault light was flashing while the drive was spinning up (the 'chirrup noise') so I set up its DSSI parameters and booted the system. No errors on startup, and indeed no errors while I was copying things to it, but the fault light appears to be acting like a drive activity light which is not something I've ever seen before. The drive works fine, all $ANALYZE commands are happy. Anyone? Cheers, -- adrian/witchy Owner of Binary Dinosaurs, the UK's biggest home computer collection? www.binarydinosaurs.co.uk

12 years, 10 months

1
0
0 0

My Compaq SLT/286 on YouTube

by terry＠webweavers.co.nz

My Compaq SLT/286. Lovely machine but getting a new Dallas battery in there is not easy. http://youtu.be/DJWyaJ086Ho

12 years, 10 months

1
0
0 0

Fixing a Micropolis 1375 drive?

by shadoooo＠gmail.com

The problem indeed is often caused by a gummy part going to goo after some years... The head assembly can move around a fixed axis near a front edge of the disk. The extremes of this movement have a couple of bumpers of this short-lasting gummy, that after 10 years goes to a viscous black material, loosing its tickness: that is, the extremes of the movement are now some degree more than the original device. Note that the bumpers are attached to metal holders that can be moved sligtly and that are fixed to the holding structure with two bolts each. (i can provide pictures of it all). The heads when the disk is stopped down "fly" to the park position, that is on one of the extreme (the most inner position over the disks). As the disk is powered up, the electronics put the heads to the inner end of the parking area, so the mechanical lock, that holds the heads even when the disk is powered down, can be easily disengaged. On the faulty drives, because of the loss of thickness of the bumpers, this operation let the head to fall outside the park area (too much toward the inner part of the disk) causing the electronics to detect a problems, and so forcing a new park operation, and all restarts.... I fixed this problem on a couple of disks. I needed to open the disks in a very clean room (few dust around), powering the disk at open-hearth, loosing a little the two bolts of the park area extreme, and moving the bumper holder slowly with the disk in movement, so letting it retry the spin-up sequence, until it seems to regain normal operation. Then I give a little bit more of thickness (we are talking about 0.1mm more or so) and refixed the two bolts. Then I tried to power-down and power-up to be sure that all works well. This saved a couple of disks completely. If you need it, I can supply good pictures of the inside of the disk, with some more advice. Andrea

12 years, 10 months

2
1
0 0

Computer Rental

by jthecman＠netscape.net

Hello I received a email from a movie company wanting to either buy or rent a IBM model 5150 computer for a moving they are shooting. The museum has one one but I have no idea what a good rental rate would be per week or month. Also it would be shipped out of the country and Im thinking a large deposit would be required for this to happen. Has anyone done something like this before and can share some tips? John K

12 years, 10 months

20
26
0 0

Free NorthStar Horizon manuals in So Cal.

by tosteve＠yahoo.com

Free for the cost of shipping: 1. NorthStar Horizon Computer System Manual (DD) 2. NorthStar Z80A Processor Board ZPB-A Manual 3. NorthStar System Software Manual4. NorthStar 32K RAM 5. NorthStar Horizon HRAM Users Manual http://bitpig.com/temp/NS-manuals.jpg Located in southern California - Orange County 92656

12 years, 10 months

1
0
0 0

HDOS commands and syntax

by starbase89＠gmail.com

Greetings! I recently acquired a Heath H89 computer with an H77 disk drive. I've gotten it to boot into HDOS, but I don't know how to make it do anything. Is there a reference available online? I mainly want to know how to mount disks, view their contents and run programs. Thanks for any help! Joe

12 years, 10 months

3
2
0 0

Computer Rental

by jonas＠otter.se

On Sun, 11 Aug 2013 23:55:02 -0600, Eric Smith <spacewar at gmail.com> wrote: > I still haven't actually seen_Swordfish_. Maybe I'll rent it some day. > > Eric Don't. It is really awful.Travolta and the terrible plot and screenplay nullify any good which Hugh Jackman, Halle Berry and Vinnie Jones do. /Jonas

12 years, 10 months

1
0
0 0

Fixing a Micropolis 1375 drive?

by tingox＠gmail.com

Hi, A friend of me recently got a nice machine, a ND (Norsk Data) Satellite Network Gateway. (For people wondering about Norsk Data, check www.ndwiki.org) Anyway, the drive in the machine is a Micropolis 1375 scsi drive. And it stopped working. Of course it was "goo" on the head assembly bumper(s). He has removed that and inserted a paper strip, but the drive still doesn't work. Are there any other known failure modes for the Micropolis 1370-series drives? Description of symptoms (translated by me, any errors are mine): - the drive spins up - disk activity light (on machine?) turns on - after a while the drive reduces RPM noticeably for about a second the last two steps repeats, and after about 5 minutes the drive spins down and stops rotating. But the disk activity light still blinks, and a faint clicking noise is heard every time the disk activity light is on. He also wonders if moving the electronics from a different 1375 drive to his drive would work, assuming he could get one that works. Has anyone done this? (those refurbished Micropolis 1375 drives at about USD 400 looks a bit suspicious - the technical data is different) -- Regards, Torfinn Ingolfsen, Oslo, Norway

12 years, 10 months

2
2
0 0

Turning the Apple //e into a lisp machine, part 1

by lproven＠gmail.com

http://blog.nullspace.io/apple-2-lisp-part-1.html 4min video I am amused that the narrator describes an odd (to him) bit of functionality of the Apple ][: it contains built-in hardware to turn an incoming audio stream into data in memory, which they use to transmit their Lisp into its RAM, as it has insufficient memory to develop code on the machine itself. :?) -- Liam Proven ? Profile: http://lproven.livejournal.com/profile Email: lproven at cix.co.uk ? GMail/G+/Twitter/Flickr/Facebook: lproven MSN: lproven at hotmail.com ? Skype/AIM/Yahoo/LinkedIn: liamproven Tel: +44 20-8685-0498 ? Cell: +44 7939-087884

12 years, 10 months

2
1
0 0

Looking for MSX2 expertise

by LYNCHAJ＠YAHOO.COM

Hi As you may already know, at the N8VEM project we are working on an S-100 VDP. This board has a V9939 video display processor and a AY-3-8910 sound generator which should allow us to have some MSX2 compatibility when combined with a backplane, S-100 Z80 CPU board, and a memory board. There are more IO and memory features necessary for full MSX2 compatibility required though. I am considering a designing a board to provide the balance of MSX2 functions so that the combination of an S-100 backplane, S-100 Z80 CPU, and S-100 VDP. I envision such a board to be composed of SRAM memory, a couple of 8255 PPIs, a card slot plus whatever extra IO and memory we need. If anyone has detailed MSX2 experience and would like to help out on designing an S-100 MSX2 compatibility board to complement the S-100 VDP please contact me. S-100 and MSX seem like a neat combination but no one has tried it AFAIK. Thanks and have a nice day! Andrew Lynch

12 years, 10 months

6
11
0 0

am26ls29

by bthomas＠brothom.nl

Hi, I need a replacement Am26LS29 for a CNC machine that has one that is broken. Our normal suppliers don't have them anymore. Any advice where I might get one? Regards, Bert

12 years, 10 months

2
2
0 0

2026

2025

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

2009

2008

2007

2006

2005

2004

2003

2002

2001

2000

1999

1998

1997

test-drb