test-drb February 2006

test-drb@ccmp.vtda.org

224 participants
452 discussions

by chrism3667＠yahoo.com

the 8088 can support 64k ports, so logically the lower 16 address lines would be utilized to address them. A16-19 were multiplexed with other pin functions. IIRC the pc only allows for 256. Probably a good book on the topic is Interfacing to the IBM PC by Eggebrecht (Sams). Dont rely on that being the exact title or the way the authors name is spelled. Chances are its available on Amazonia for a song. __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

18 years, 10 months

Oscilloscope question

by francisco.taboas＠urv.net

Hi, My name is Francisco T?boas. I read that you have the operator manual for a solartron 7150 multimeter. Im very interested on having a copy of it. Do you know where I can find it?

18 years, 10 months

Classic computers on TV 2 - Egg card commercials (UK)

by bpope＠wordstock.com

Ade Vickers wrote: > Currently, Egg are running a series of amusing UK comercials featuring a > bunch of gerbils - some of whom are having financial problems. > > In order to help them out, Egg "give" the gerbils a computer(!) - which is > clearly a stylised CBM Pet, albeit with the incongruous addition of a large > trackball. Egg do, conversely, stick faithfully to the green-on-black > display, even if their gerbil-scale Pet seems to exhibit better graphics > resolution than the prototype... > > Cheers! > Ade. > > http://www.visit4info.com/moredetails.cfm?adnum=29668 http://www.visit4info.com/moredetails.cfm?adnum=28418 has the ads... FYI - they are guinea pigs! :) Cheers, Bryan

18 years, 10 months

Repairing wall warts

by compoobah＠valleyimplants.com

>I don't understand how a receptacle can trip a circuit breaker. At worst, >it would seem that it would fail to make contact or have high resistance >contacts. I don't understand the etiology of the problem myself, but that is what we heard back after the district sent in several electricians. Several possibilities: breakdown of insulation or impurities in insulation, mechanical failure due to stressed parts, or transmission error (district says: shoddy wiring, [they even used the] cheap plugs - the part in brackets gets dropped out, etc.) Anyway, there is a very noticeable difference between the cheapie wiring supplies and the nicer "commercial grade" stuff, similar to the difference between a modern cheap PeeCee and a real computer.

18 years, 10 months

What to do with that old IBM Graphics Printer

by terry＠terryking.us

Hi Guys, Since you seem to be the ones who "didn't throw that stuff away", like me :-) Thought you might like to look at this: P.R.CRANE is a Computer Demolition Project that creates a PC-Controlled Robot Crane. You can control the crane manually with the arrow keys, have it learn a series of steps, and create and edit a robot control program. P.R.CRANE is made from an old IBM 5152 Graphics Printer, plus about $25 of parts available at the hardware store and Radio Shack You can find this at www.terryking.us (Hit the PARPORT button), and then PRCrane is a one-liner near the top. Somehow I think you'd also have an old DOS machine to run this... If not, there are ways to force XP to let go of it's IO-Priviledge compulsion... Let me know if you get one of these running... I have some photos of kids running these a few years ago. Also: Anyone have an old XT that you want to know what to do with??? I have an idea. Regards, Terry King ...On The Mediterranean in Carthage terry at terryking.us Regards, Terry King ...On The Mediterranean in Carthage, Tunisia terry at terryking.us

18 years, 10 months

Wanted to buy (or trade)

by news＠computercollector.com

I'm looking to buy a Kyocera "Keytronics 85". This was the base model for the Tandy Model 100 / Olivetta Model 10 / NEC PC-8201 portables from 1983. I have the Tandy Model 100 but would prefer the Kyocera if anyone prefers to trade. Contact me OFF-LIST please. :) ----------------------------------------- Evan Koblentz's personal homepage: http://www.snarc.net Computer Collector Newsletter: >> http://news.computercollector.com Mid-Atlantic Retro Computing Hobbyists & Museum: >> http://www.marchclub.org >> http://groups.yahoo.com/group/midatlanticretro/

18 years, 10 months

Commodore 64 free to a good home

by rigdonj＠cfl.rr.com

FYI >Date: Sun, 19 Feb 2006 09:02:32 -0500 >From: ROBERT KRYL <r.kryl at worldnet.att.net> >Subject: Commodore 64 free to a good home >To: rigdonj at cfl.rr.com >X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2800.1409 >X-Mailer: Microsoft Outlook Express 6.00.2800.1409 >X-MSMail-priority: Normal >Original-recipient: rfc822;rigdonj at cfl.rr.com > >Hello, Joe, > >We are moving from Delray Beach to Minnesota, and we must find a good home >for a much loved Commodore 64 that has (I am told) virtually all the >programs available, monitor, cpu---the works. > >We move next weekend, and finally my guy has agreed to leave it in Florida >(between us we have three others!) > >If interested, pleas let me know asap! If you know someone else who is, >please pass the word quickly! Thank you. > >Cherie cboen at charter.cnet >

18 years, 10 months

Repairing wall warts

by compoobah＠valleyimplants.com

>They are--probably around $5 in single-unit quantities. I use one on my >automatic dishwasher. > >It's the hospital-grade receptacles and plugs that are dear here. Aside >from an additional endorsement and a different color, I don't know if they >differ much from the ordinary consumer grade stuff. > >Cheers, >Chuck For anything except the most basic use, get the commercial grade. We had big problems at the computer lab at my school because the original electrician used the cheap receptacles, and they started tripping the breakers last year . . . I think most of the plugs you can get are pretty well made, though. Expect to spend about $7-$10 for a grounding plug with screw terminals.

18 years, 10 months

problem: getting the TU58 emulation working

by henk.gooijen＠oce.com

I tried to add the TU58 emulation (of Will Kranz) to my 11/34, but it does not work. Here is what I have done so far. I added an SLU/RTC (M7856) in the 11/34, and while I worked that out, I added a M7856 page to my website. The intention is to use the added DL11-W for a connection to the TU58 emulation on a (DOS) PC. I configured the DL11-W to CSR 776500 and the vector to 300, for DD:. LTC is disabled, as this is the second DL11-W in the system. The first DL11-W is the system console port. The serial TX and RX channel are set to 9600,N,8,1. When I boot RT11 and enter .SH DEV the output shows that the DD driver is installed and sitting at 776500, with vectors 300 and 304. When the DL11-W is not installed in the system, RT11 reports DD not installed. Next, I made a cable to connect the DL11-W to the serial port of the PC. To check the cable between the PC and the M7856, I started Win98 and used a terminal program. When I enter a character in the terminal app, I can read that character in the RBUF (776502). When I deposit a value in XBUF (776506), I see that character in the receive window of the terminal application. So, the cable is fine. BTW, I use only 3 wires: RxD, TxD, and Gnd ... I boot the PC to DOS, actually Win98 command prompt, not to Win98 itself and then starting a DOS box. Then I run TU58.EXE, for example "TU58 -cTST58.TAP". TU58 seems happy, it takes a second (to format the new "tape") and then reports to be "waiting for a BREAK, or enter Escape to continue". So, I enter ESC. Now the TU58 emulation says that it is waiting for packets ... I have RT11 running on the /34. Then I enter on the PDP-11 console .DIR DD0: Nothing happens, no output appears on the TU58 emulation on the PC. RT11 seems to hang, at least when I enter text on the PDP-11 console, that text is echoed on the VT102, but that's all! Entering control-C prints ^C, but does not return me to the . prompt. BTW, the TU58.INI file has these lines: port 0 baud 9600,N,8,1 That means that I am not using interrupts (on the PC), but polling. I assume that when you enter .DIR DD0: on the PDP-11 console, the TU58 emulation should at least print a "received packets", but nothing is happening. BTW, I also tried with an "irq 4" line in the tu58.ini file, but that gives the same results. I have the feeling that I am overlooking something obvious, or doing something stupid. Should there be some data (receiving packets from the PDP-11) appearing in the TU58 emulation screen? thanks, - Henk, PA8PDP. This message and attachment(s) are intended solely for the use of the addressee and may contain information that is privileged, confidential or otherwise exempt from disclosure under applicable law. If you are not the intended recipient or agent thereof responsible for delivering this message to the intended recipient, you are hereby notified that any dissemination, distribution, or copying of this communication is strictly prohibited. If you have received this communication in error, please notify the sender immediately by telephone and with a "reply" message. Thank you for your cooperation.

18 years, 10 months

Old Japanese MPUs

by lee＠geekdot.com

> There's a 27C256 on it and a 20 MHz XCO and some assorted glue. > The largest package is a Mitsubishi MN8601ME1, 64 pin "shrink DIP". > Next to it is a MN8611A 42 pin "shrink DIP" and a QFP MN51040MGU, > which I believe is a gate array. > Does anyone have a clue as to what the heck this is? Some Mitsubishi MCUs have 65C02 cores in them, do you have a dump of the EPROM yet? The contents of that are probably your best clue. Lee.

18 years, 10 months

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test-drb February 2006