test-drb February 2011

test-drb@ccmp.vtda.org

155 participants
210 discussions

by wh.sudbrink＠verizon.net

My Altair 680 has achieved the position of primary attention on my workbench. All of the ICs are socketed. Not having seen power in over 20 years, I did not trust the power supply as far as I could throw a bus. I pulled all of the ICs, attached dummy loads (automobile bulbs) and powered up. Sure enough, there was AC all over the place (where there should have been DC). I replaced all of the electrolytic caps and that got rid of the AC but some of the voltage levels are very wrong, at least as compared to what is written on the schematics. The worst offender is just off the "plus" side of the full wave bridge (BR-1). It should be nine volts but is actually at 11.5. This makes what should be the main five volt rail a little more than 9 volts... the far side of VR-1 (a 7805). The wave form coming off the transformer is really ugly not a smooth sine wave. I hate power supplies. I don't really understand, looking at the schematics, what this transformer should be doing. My guess is that it should be making a nice nine volt, 60 cycle AC sine wave with each of the two outputs 90 degrees out of sync? What could be wrong with a transformer that it would produce something like: __ / \ | \ / \_ / \ | / | / \_/ bent and very squared off at spots? My scope shows nice clean 120 coming into the transformer. How do I figure out a part number for a replacement transformer? Thanks!

13 years, 4 months

Perkin Elmer 7300 Pro System Museum Quality!

by mail.list＠analog-and-digital-solutions.com

Here's one some of you might like. Perkin Elmer 7300 Pro System Museum Quality! http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=2738081449 Current bid US $9.99

13 years, 6 months

Stan Viet passed away

by evan＠snarc.net

http://www.legacy.com/obituaries/floridatoday/obituary.aspx?n=stanley-veit&… Very sad.

13 years, 7 months

Atari 800xl "translator disk"?

by dbetz＠xlisper.com

I have an Atari 800xl and a couple of 1050 disk drives. I also have two copies of the M.U.L.E. game on disk. Unfortunately, I can't get either to boot on the 800xl. I suspect that these are older games that were written for the 400/800 and may need the "translator disk" that allowed the 800xl to run games written for the older machines. Does anyone know where I could obtain a copy of this translator disk? Thanks! David Betz

13 years, 8 months

Stag PPZ EPROM programmer

by coredump＠gifford.co.uk

I have a fine old Stag PPZ modular EPROM programmer: http://www.gifford.co.uk/~coredump/inst.htm#PPZ It takes plug-in EPROM (model Zm2000) and PAL (Zm2200) modules, called Z-modules by Stag. I've recently acquired a new module, Zm3000, which looks like a more recent EPROM module. The chips in the Zm3000 are date coded in 1993, whereas the Zm2000 is nearer 1988. The PPZ main unit contains a 6809 CPU and a small CRT display. Does anyone know anything about this system? What about other Z-module types? In particular, should the Zm3000 work with the PPZ, because I currently get an error message "Incorrect Mainframe"? Thanks in advance for any clues! (Virtually all I get from Google is a link back to my own web page!) -- John Honniball coredump(a)gifford.co.uk

13 years, 8 months

SCSI -1 to IDE and SD project

by trebor77＠execpc.com

This looks interesting. As collector of DEC systems my need is slightly different insofar as due to the rapid disappearance of ST506 (MFM) drives I need to make say an IDE drive look like a an ST506 drive to a DEC MFM controller. I concur. I have a CompuPro 816 System with a Q540 MFM 40 Meg HD that is getting shaky. Sure would like to be able to use an IDE of which I have several that would work. Lets hope others will pick up the thread and maybe Andrews Group will consider creating a MFM to IDE adapter Board that would insert between the MFM Cables and the IDE Drive. I'm sure there is a lot of Older CP/M machines out there that would benefit. Bob in Wisconsin

13 years, 8 months

Faulty Apple Lisa 2/10 Drive -READINGS!

by terry＠webweavers.co.nz

Found those capacitors. Yes, they were indeed the trio that were clustered together. All the -ve sides clustered together, and the +ve wired to a motor output connection just as you said. I spent tonight extracting the IC and the capactors. It went surprisingly smoothly considering this is probably the smallest circuit board I've worked on in terms of closeness of tracks. Now to just wait until the ICs arrive from Hong Kong. I hope it's not by slow boat. I've ordered and paid for the ICs but have yet to hear any kind of acknowledgement apart from the standard paypal reciept. I've also bought an X/Profile emulator. Luckily I've managed to sell one of my Osborne 1s for $340 NZ (about $255US) to help part-pay for it! So, here's hoping BOTH Lisas will be up and running 100% soon!. An ominous sign in the Lisa 2 though. Yesterday it would just suddenly switch off I was testing this drive. A little jiggling and waiting a while, then a switch on and it would suddenly go again. Could be something loose, or could be the PSU starting to give up the ghost. I have a spare working (I think) PSU, so I might have to call that into service....or attempt a repair if that's indeed the problem. Maintence/repair is an ongoing process with this old iron isn't it. Terry > Take a look at one of those HP drive schermatics I mentioned. If you are > working from one of 'my' schematics, oyu want ot look at the sheet > entitled 'Sony Floppy Drive Spindle Motor Sheet (3)'. You'll see the > TA7259 chip. Connected to the inputs are the 3 hall devices H1-H3. > Connected ot the outpus are the 3 motor windings -- notice how the other > end of these windings are all linked together, but go nowhere else -- > that's the 'star' (or 'wye') configuration I was talking about. And just > to the left of the widnigns are 3 capacitors C11, C12, C13 wired in > another star circuit. > > I have no idea what the capacitors will be labelled on your PCB. They are > likely to be a simular value. See if you can find 3 cpaacitors, arounf > 10uF each, with the +ve side wired to a motor output connection on the > chip and the 3 -ve sides all linked together. It might be the 3 > capacitors cludered just to the right of the chip in the photo, it might > not. You cna use the resistance range of your multimeter to check what is > connected to what, of course. > > Alas without the PCB in front of me (and thus being able to trace > connections) I don;t think I cna be more definite. > > -tony > > > > > > ----- > No virus found in this message. > Checked by AVG - www.avg.com > Version: 10.0.1204 / Virus Database: 1435/3442 - Release Date: 02/13/11 >

13 years, 9 months

road trip score: AViiON, Microdata 1600

by mcguire＠neurotica.com

Yesterday my girlfriend and I returned from a hastily-scheduled road trip to Maryland; we went to see a friend who is gravely ill. While we were in town, we took the opportunity to visit a few other people. Another friend up there is preparing to move, and he dropped a few things in my lap since I was there with a mostly-empty car. The first was a Data General Aviion AV300 workstation. This is one of the few machines built around the Motorola 88K CPU. It came with its original keyboard, mouse, monitor, and a full set of DG-UX manuals. I don't yet know if it's functional, but according to my friend it was running a few years ago. The second is something I'm REALLY excited about. We went to his garage and he pointed me at two dusty card-cages full of boards, and told me that he picked them up from a college loading dock twenty years ago, and that he had no idea of what they were, but there were core memory boards in them. Oh, and there's this lights-and-switches front panel that goes with them. (!) Upon getting them home and digging around, it appears to be a nearly complete Microdata 1600 CPU. I have the two backplanes with card cages and boards, and the front panel, along with some cables. I lack the power supply, but I can build one of those...with that, I think I have enough to resurrect the basic CPU. Neat stuff! -Dave -- Dave McGuire Port Charlotte, FL

13 years, 9 months

IBM PC Convertible Speech Module.

by netsurfer_x1＠fastmailbox.net

Anyone here have the speech module for an IBM PC Convertible they want to get rid of? I just got one of these laptops & was hoping to score one. David M. Vohs Digital Archaeologist & Computer Historian Computer Collection: "Triumph": Commodore 64, 1802, 1541, Indus GT, FDD-1, GeoRAM 512, MPS-801. "Leela": Original Apple Macintosh, Imagewriter II. "Delorean": TI-99/4A, TI Speech Synthesizer. "Spectrum": Tandy Color Computer III. "Monolith": Apple Macintosh Portable. "Boombox": Sharp PC-7000. "Butterfly": Tandy 200, PDD-2. "Shapeshifter": Epson QX-10, Comrex HDD, Titan graphics/MS-DOS board. "Scout": Otrona Attache. (prospective) "Pioneer": Apple LISA II. "TMA-1": Atari Portfolio, Memory Expander + "Centaur": Commodore Amiga 2000. "Neon": Zenith Minisport.

13 years, 9 months

Historical Mainframe Security Docs Available

by lee_courtney＠acm.org

Hi all, I'm cleaning out my library and have the following set of IBM mainframe security documentation free for 20lbs shipping from 94025. Sorry, all or nothing - I only want to make one trip to ship these. These manuals cover the period from early to late-1980s. They go to the first person to accept the lot. Will get recycled if not claimed by 2/2. Have already offered to Bitsavers, and have scanned in case Al wants later. Lee Courtney lee_courtney at acm.org Auditing Top Secret Overview MVS Secured using CA-ACF2 RACF Overview MAJOR COMPONENTS OF AN ACF2-PROTECTED SYSTEM ACF2 Training Class Access Control Facility Auditor's Guide Access Control Facility IMPLEMENTATION PLANNING GUIDE The Access Control Facility General Information Manual The Access Control Facility Overview Access Control Facility UTILITIES MANUAL ACF2 Composite Index ACF2 Release 4 Enhancement Summary The Access Control Facility Administrators Guide VM Secure Users Guide VM CMS User Guide and Reference Manual VMSECURE Quick Reference ACF2 Reporting System Reference Card CA-ACF2 Audit Overview What About VM Security VM Software Fee Schedule VM Software Newsletter AUTOMATING THE AUDIT OF RACF PROFILES CONSUL Mainframe Security Overview CONSUL RACF Sample Output CONSUL RACF User Reference Manual BoKS Administration BoKs Release Notes and Getting Started Guide

13 years, 9 months

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test-drb February 2011