test-drb November 2002

test-drb@ccmp.vtda.org

252 participants
556 discussions

by mtapley＠swri.edu

All, More info: >Linear Technology 1.5A adjustable voltage regulator, TO-220 package. Has about the same voltages on its pins when the system is either running or failed: Vin 5.4V, Vout 3.5V, Adj(gnd) 2.1V Should that last be 0.0? I'm referring all of these measurements to Chassis ground, obtained by wedging a lead against the power supply housing. Measurements power-off with the Ohmmeter say that last pin is about 75 Ohms away from Chassis. Ironically, that's more than the readings for either Vin or Vout. >Low Power Low Offset Voltage Dual Comparator (LM193) This guy is intimately linked to the failure. V+ connected to 5.4 V (Red wires) Gnd connected to ground (Black wires = chassis ground.) Output A obeys the following rule: running fail out A 5.4V 0V One other interesting thing is that the first few times I touched "out A" with the probe, it failed immediately. I actually *did* get to see the needle swing a couple of times, as it tried to decide whether to run with the probe on that lead. Eventually it decided to run even with the probe on the output. The meter claims 20,000 ohms/Volt DC, so I did not expect to crash the system by probing it. I tried Out B, but it didn't change while I was watching and I didn't record what state it was in. Thermal dependence is still flaky, but it did go rapidly and persistently toes-up when I turned the hair-dryer + funnel combo on the LM193. I only got to do one trial, though, before it got to the point that it wouldn't run long enough to convince me the heat gun was doing the deed, so that could have been coincidence. I tried a few other parts of the circuit board, and got similar results out of a big chip near the SCSI connector. Dunno if that's relevant. - Mark

22 years, 1 month

Broken SIMM tabs on Mac IIci

by Robert_Feldman＠jdedwards.com

If you still have the broken pieces, you can probably glue them back on with a solvent-weld plastic cement such as Tenax 7R. Then treat the mended sockets with extra care, as they will never be as stong as they were originally. -----Original Message----- From: Bob Lafleur [mailto:bob_lafleur@technologist.com] Sent: Thursday, November 14, 2002 11:26 PM To: cctalk(a)classiccmp.org Subject: Broken SIMM tabs on Mac IIci Ok, so I did it... When trying to remove the SIMMS in my Mac IIci I broke some of the little tiny plastic tabs, so now the new SIMMs won't lock in. Is there some "fix" to get the SIMMs to stay in, short of soldering new sockets into the board (which I am not about to do)? Also, I broke them on Bank A. I assume you can't use RAM in Bank B without having Bank A full... Should I just trash the motherboard? Or can I salvage it somehow? Are these SIMM tabs particularly vulnerable, especially on this old equipment? I broke them on 2 machines, and on the 2nd one I did, I was trying to be very careful. - Bob (not a happy MACer today)

22 years, 1 month

CPM-8000

by dwightk.elvey＠amd.com

Hi I've just sent my latest CPM-8000 stuff to the unofficial cp/m site. It is available under: http://www.cpm.z80.de/binary.html It has a working boot image plus the other files to run this on an Olivetti M20. It does have code to regenerate a new BIOS so that it can be ported to another Z8001 machine. If anyone is contemplating this, they should contact me or Chris to help out. There are a few things that effect hardware that one should know. It would also be very difficult to complete the job without access to a M20. I am willing to run compiles on my machine for anyone that writes their BIOS to create a working image. Thanks to Hans B Pufal, Gaby Chaudry and Al Kossow. Without there information, I wouldn't have been able to begin to get things working on the M20. Of course, 50% of the credit goes to Chris Groessler, as we collaborated on working the bugs out of creating the first boot images. Dwight

22 years, 1 month

Beginner's Supnik Emulator help

by jpl15＠panix.com

I downloaded E11 some years ago on a Pent I desktop but never got it to work, prolly due to no smarts on my part. This evening, thinking it might be fun to hook up my M4 Data SCSI 9trker to the laptop, and use it to work on Stuff to be transferred to the 11/44 later, I DL'ed the latest and greatest from his Site (V3.1), and installed it. I am running Win 2000 on an IBM A21m Thinkpad, with 256M of RAM and a 10GB HD. Right away, my little Pest Control program flags me that 'ntvdm.exe' has been detected, and as many times as I exterminate it, it returns as soon as e11.exe is run. Is this a bug, or something in E11 that looks like one? The details say it is a VBB virus tutorial... if it *is* a virus, or virus-related creepy-crawly, then there are much bigger problems afoot and I'll scrub the whole thing. At the E11> prompt in the DOS window, I type: E11> set cpu 44 E11> mount du0: rsx11m ERROR opening file - RSX11M.DSK E11> mount du1: ra80 ERROR opening file - RA80.DSK And so on... each iteration brings up the virus warning, and the disk emulations seem to be AWOL. So: any ideas? Obvious Stupidities? etc? Cheers John

22 years, 1 month

Broken SIMM tabs on Mac IIci

by SUPRDAVE＠aol.com

In a message dated 11/15/2002 9:20:49 AM Eastern Standard Time, Robert_Feldman(a)jdedwards.com writes: << If you still have the broken pieces, you can probably glue them back on with a solvent-weld plastic cement such as Tenax 7R. Then treat the mended sockets with extra care, as they will never be as stong as they were originally. >> why not just use hot-melt glue to keep the SIMMs in? At least you could remove them later.

22 years, 1 month

Big computer "scrap" cleanup in Washington, DC

by wh.sudbrink＠verizon.net

I just found this by accident: ============================================================ Junk Collection on Monument Grounds Updated: Friday, Nov. 15, 2002 - 8:02 AM EDT. (Washington) -- Got an old computer that's taking up space? How about a TV that's seen better times? Friday and Saturday, you can bring your old electronics to the grounds of the Washington Monument to be safely discarded. The event is a joint effort by the White House, the District, and the EPA. Environmental experts say some old electronics contain lead or other materials that can potentially harm the environment if they're not handled properly. Computers, telephones, office equipment, and some televisions will be accepted. But no luck if your TV is larger than 19 inches or encased in a wooden console. Kitchen appliances, microwaves, vacuums, and air conditioners also can not be turned in. (Copyright 2002 by The Associated Press. All Rights Reserved.) ============================================================== Now, granted the stuff that shows up will likely be 99% real junk (386 Wintel boxes) but is anybody in the area going to try to snag any of the 1% gold that may show up? I wish I had known about it sooner, my weekend is booked solid. Bill

22 years, 1 month

Altair32 emu and VanDyke CRT fix

by jpl15＠panix.com

Using VanDyke's CRT telnet client as a 'console' for Rich's Altair Emulator, I find that I have to configure an option to make it play nicely: In 'Sesion Options" "Connection" "Telnet" [X] Force Character at a time mode That seems to have made it work well... and the launching sequence is critical, as laid out in a previous message... Cheers John

22 years, 1 month

Check out the bid for the games that was not high enough

by jrkeys＠concentric.net

Talk about people with money to burn http://cgi.ebay.com/ws/eBayISAPI.dll?MfcISAPICommand=ViewItem&item=139553608 0

22 years, 1 month

Found Altair problem:

by jpl15＠panix.com

Turned the damn firewall off. Should the CP/M disks just have one file each? Like PIP.COM on the CPM22 disk... This had no effect on Ersatz-11... it still is unhappy with me for some unfathomable reason... Cheerz John

22 years, 1 month

ANN: Altair32 Emulator version 2.40 released

by rcini＠optonline.net

Hello, all: Tonight I posted the latest release of the Altair32 Emulator for Windows. There have been a few changes since the last release in August. Working closely with Scott LaBombard, we've added configurable memory ranges (split between RAM and ROM), a ROM Manager to allow the easy adding or removing of ROM binaries, and selectable console terminal using telnet or the Windows Console. Scott also generated new CP/M 2.2 disk images from the 2.2 source. He also re-wrote the CBIOS to fully enable 8 emulated disk drives, including up to 4 "large" (1.1mb) disks. Finally, in an effort to improve performance and reduce CPU utilization on the host computer, I made the conversion to a timeslicing model based on Jim Battle's Solace project. Enhancements on tap for the next release include a toolbar, a tabbed configuration dialog, and VT100 control code support within the Windows Console code. You can visit the project page at http://highgate.comm.sfu.ca/~rcini/classiccmp/Altair32.htm to download the latest ZIP file. Thanks and enjoy. Rich Cini Collector of classic computers Build Master for the Altair32 Emulation Project Web site: http://highgate.comm.sfu.ca/~rcini/classiccmp/ /************************************************************/

22 years, 1 month

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test-drb November 2002