test-drb January 2002

test-drb@ccmp.vtda.org

303 participants
1201 discussions

Looking for a boot disk for OS/9 for a CoCo 3

by vze2wsvr＠verizon.net

Checked on eBay, none available. Anyone have such a thing? Original preferred but will accept a permanent offsite backup as well. Let me know how much you want for it. TIA, Eric

22 years, 11 months

I need PDP-11/34A Help Again (Suprise Suprise)

by Andreas.Freiherr＠Vishay.com

Owen, still interested in getting your PDP-11/34 to work? - I am just about to reassemble mine after relocation. RUN light off and display 000002 means the processor halted at memory location 2, so it has probably executed a HALT instruction (opcode 000000) from location 0. Try this: enter 773000, load this address, and then press START. Since 773000 is the standard start address for a bootstrap ROM, this should get you a response on the console terminal attached to the DL-11W. (Don't remember which, but I think it should ask for a two-letter device code to boot.) BTW: The DL11-W has a 20mA interface as well as RS-232. (Note the "1488" and "1489" chips being present as well as a number of transistors and other discrete components.) Which on is used depends on the cable: the plug will have some wire connections to code it for either 20mA current loop or RS-232 / V.24. If you have an original cable with the usual DB-25 connector, it should be OK: current loop used a completely different 6-pin connector. For the settings at the terminal, I don't know this particular type, but with most DEC lines you should be best prepared if you use XON/XOFF handshake ("Main Rcv Hndsk" / "Main Xmt Hdsk"). Since at PDP-11 times, the 8th bit was commonly used as a parity bit, set your terminal to ignore this. Otherwise, you may get garbage characters instead of about every second readable character. A RS-232 break signal (certain voltage level applied for a certain time, not a sequence of bits!) can sometimes cause a PDP-11 to HALT (depending on settings on the interface board), so you may want to avoid this... (perhaps by choosing an appropriate setting for the "Disconnect" option for now?) So much from memory. If you need more details, let me know, and I'll dig into the docs. Good luck, Andreas -- Andreas Freiherr Vishay Semiconductor GmbH, Heilbronn, Germany http://www.vishay.com

22 years, 11 months

BBC Master keyboard

by CLeyson＠aol.com

Just got myself an old BBC for 6502 assembler. My problem is that some of the key contacts need cleaning. My question is - Am I correct in thinking that all the keys need to unsoldered from the PCB, and are the key contacts easy to get at and clean ? Chris

22 years, 11 months

LEAST valuable collectibles (was: Apple II boards

by thilo.schmidt＠unix-ag.org

Hi, On 24-Jan-2002 Bryan Pope wrote: > Are there any companies out there still making dot-matrix tractor-feed > printers? Look at http://www.psi-si.de I've seen some of their printers in action, quite impressive ;-) bye -- Sanity is the trademark of a weak mind. -- Mark Harrold

22 years, 11 months

I'm Baack!

by rigdonj＠cfl.rr.com

I guess I only thought I'd get out of this hobby. Last week I got this <http://www.classiccmp.org/hp/mds-80/picture.jpg> in the mail. This is from a deal that I've had working for over a year. I've got it running and it works nice! So has any body got any MDS manuals, SW or parts that they'd like to part with? Joe

22 years, 11 months

WTH is this?

by CLeyson＠aol.com

Looks like an Analog Devices measurement card of some sort. Try asking Analog Devices: URL www.analog.com or mailto: wwwcustomer.service(a)analog.com. Chris

22 years, 11 months

Z-100 serial ports

by acme_ent＠bellsouth.net

Although I have (I believe) all of the manuals for the Zenith Z-100 (not Z-100 pc), I cannot find any reference to the serial ports on this box. What are the addresses of the DTE and DCE ports? I'd like to write some assembly code to access these devices (under CP/M-86) but want to control them at the hardware level instead of making BDOS calls. Any help out there? TIA, Glen 0/0

22 years, 11 months

Mystical Ugly Computers (Was: RE: Appropritate comic strip....)

by mythtech＠Mac.com

> > This comes from a person that bought a G4 cube the day they announced > > it would be discontinued. I wanted to insure that we got one for my > > little collection. > > You could have waited several years and got it for the fraction of the > cost, either online or at a thrift store ;) >From what I have heard about the plastics on the cube... they might not last long enough to make it to the thrift stores. I was under the impression, they were fairly fragile. -chris <http://www.mythtech.net>

22 years, 11 months

Ugly Computers (Was: RE: Appropritate comic strip....)

by fmc＠reanimators.org

Jeff Hellige <jhellige(a)earthlink.net> wrote: > [...] As for the new iMac, I think that, like > the original iMac, it's meant to demystify computers for those that > have no interest in them for the most part and who don't want a plain > beige box taking up space. Like it or not, it's hard to ignore and > it does make a statement. Demystify? I don't know, I expect my mother is as mystified about her spiffy new 2001 iMac as she is about her 1988 Mac Plus. She just expects me to understand, and hopes she can figure it out before she has to resort to calling me. On the other hand, it does simplify computers! 2001's iMac came with a sheet of setup instructions. Six numbered pictures, no words, and step 6 is pressing the power switch. It's real simple, just connect keyboard to computer, mouse to keyboard, phone or ethernet to computer, computer to power, and then press the power switch. No need to fuss with monitor or speakers, they're built-in. What was real fun about this upgrade was getting the files from the Mac Plus to the iMac. The Mac Plus can write 800KB stiffies, SCSI, and serial; and the iMac can read CD-ROM, USB, Ethernet, modem, and Firewire. Note what they have in common: nothing. I did a dry run using an iBook and my old Mac Plus. First I got a Belkin USB-to-SCSI doohickey and installed that on the iBook. Then I connected the Mac Plus' hard disk to the SCSI doohickey and booted MacOS 9.2. It asked me whether I wanted to initialize the unrecognized volume, and I told it no. So much for that idea, and a good thing it wasn't listening for spoken commands as I'd probably have turned its ears blue. The next try was with Basilisk II running on a Windows Me Harder notebook, emulating a Quadra 650 and running System 7.5.3. This worked better: I was able to connect the Plus' hard disk via an Adaptec SlimSCSI PCMCIA interface and mount it and copy the files over. Then I was able to use Appletalk to share the volume over the notebook's Ethernet interface and mount it from the iBook. So the WinMe notebook went back east with me. There I found that Mom's Mac Plus' hard disk is a Jasmine, and there's something about it that doesn't work with Basilisk II running System 7.5.3. If it's on the SCSI bus, the simulated Mac hangs when it tries to mount the disk. After three days of fussing with this I punted, used Stuffit on Mom's Mac Plus to make archives of all her stuff (all 8MB of it!) and Mac Kermit to transfer the archives over serial cabling to the simulated Mac. That took a couple of multiple-hour sessions so let's say a day. Then I unpacked the archives on the simulated Mac and did the Appletalk share so the iMac could copy the files over. And y'know what? AppleWorks 6.1.2 knows how to read ClarisWorks 1.0 files. One of my co-workers was the QA lead for ClarisWorks 1.0, and he is very happy to know not only that a little old lady in Maryland was using it for most of the last decade, but that her bits are safe. I'm very happy too. -Frank McConnell

22 years, 11 months

More HP1000's

by steven_j_robertson＠hotmail.com

BTW: Was thinking about getting a camera and taking some pictures of the 1000s. If I take pictures, does anyone have the bandwidth and willingness to host them? SteveRob _________________________________________________________________ Join the world’s largest e-mail service with MSN Hotmail. http://www.hotmail.com

22 years, 11 months

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test-drb January 2002