test-drb January 2013

test-drb@ccmp.vtda.org

222 participants
294 discussions

Looking for info on Apple II card- Labnet 488

by dfnr2＠yahoo.com

Hi all, I recently acquired Labnet 488 card by Innovations in Computing, circa 1978.? This appears to be an IEEE-488 interface based on the Motorola 68488 chip.? Does anybody have any info on this card, or even better, has anybody seen one of these in use?? It would be cool to locate manuals and/or software, and actually put this sucker to use. Dave

11 years, 7 months

IBM Issued PC DOS Version 5.0 for shipping

by technobug＠comcast.net

> My recycler got in a complete, boxed (mostly) version 5.0 of DOS and was about to "recycle" it. Available for shipping from 85704. > 'Tis taken ->CRC

11 years, 7 months

FS: PDP 11/83 (UK)

by silvercreekvalley＠yahoo.com

Thanks for the replies - yes its a BA123 - just like the picture :) The system is in the UK. It is a nice machine as it usefully sits next to (or under a large) desk so doesnt take too much space. I'll get some pictures and specs online shortly.

11 years, 7 months

World's largest Mindset Computer Corp Collection available

by curt＠atarimuseum.com

Hi all, Been having some health issues as of late and bills are pouring in faster than money is coming in so I have to make a tough decision and sell my Mindset Computer Corporation Collection. I am only selling as a whole as I don't want this collection broken up. I'm gauging interest, please email at: curt(at)atarimuseum(dot)com Many have seen quite a lot of my collection as it was on display at a recent VCF East show and one an award. I have over a 1/2 dozen CPU units, expansion modules, plug in peripheral modules, keyboards, joysticks, mice, tons of software, applications, and games, many are in original boxes and are original disks, I have a huge developers manual, marketing materials, units in boxes, a keyboard in a box, peripheral accessories in boxes (many in never opened/sealed boxes), I have one of the only Mindset software carrying case bags, and much more. Need to put together a more detailed inventory, but it is extensive. Here are some photo's of a good bit of the collection (monitors are not included): http://vintagecomputer.net/vcf7/Exhibits/Mindset_exhib_Vendel2.jpg http://vintagecomputer.net/vcf7/Exhibits/Mindset_exhib_Vendel1.jpg http://vintagecomputer.net/vcf7/Exhibits/Mindset_exhib_Vendel4.jpg http://vintagecomputer.net/vcf7/Exhibits/Mindset_exhib_Vendel3.jpg Will also included domain: www.mindsetcomputer.com with sale... Regards, Curt

11 years, 7 months

IBM Issued PC DOS Version 5.0 for shipping

by technobug＠comcast.net

My recycler got in a complete, boxed (mostly) version 5.0 of DOS and was about to "recycle" it. Available for shipping from 85704. ->CRC

11 years, 7 months

CFFA3000 and Apple III?

by wheagy＠gmail.com

Great, thanks. I'll give the cleaning process a try before a speed adjustment. Thanks...Win ---- Almost all the A3 drives that have come my way were malfunctioning. Best bet is to disassemble them and carefully clean and lube. First, use some canned air to blow out all the dust bunnies. The original grease used on the head assembly rails and the spiral-cut plastic stepper wheel solidifies over the years. I usually use a tiny bit of WD-40 on a swab to remove the old lubricant, then a bit of Tri-Flow to replace it. A speed adjustment may very well be needed, but another problem area is the two trimpots on the top of the drive circuit board. They tend to grow oxide and become intermittant. Mark the position of the pots with a felt-tipped pen, then wiggle them with a screwdriver until the little gob of locking compound breaks. Squirt a small amount of non-residue control cleaner in the side and work them through their rotation a few times. Reset to the marked position. You can lock them in place again with a dab of nail polish, but don't do this until you know that things are working again! Reseat all the chips on the board and check closely for "black pin" syndrome. For some reason, the chips in the disk drives seem more prone to this (more exposure to humidity?) If you see this, pull all of them and take a contact cleaning tool to the legs. Finally, take a swab and carefully clean the head with isopropyl alcohol. I've successfully repaired four or five drives in this manner. Steve

11 years, 7 months

KS10 (PDP-10) FPGA Status

by radioengr＠gmail.com

There has been significant progress over the Holidays. All the Basic Instruction Diagnostics now execute successfully. Many of the Advanced Instruction Diagnostics also execute successfully - the Advanced Diagnostics that fail, do so because they require support from the Diagnostic Monitor (SMMON) which is not 'linked in' at this time. I have a design roughed-in for a RH-11 Massbus Controller supporting 8 RP06 Disk Drives. All 8 RP06s disks use a single 8GB Secure Digital (SD) Disk Card for media. There is still a lot to do before the Disk IO will be ready to test. I've also implemented an DZ-11 8-port Terminal Multiplexer, and the KS10-Backplane-to-Unibus IO Bridges. If anyone knows where to find the KS10 DZ-11 Diagnostic DSDZA Source code, please contact me. I have verified that I can use the same 'bits-on-disk' format as SIMH. That will allow the KS10 FPGA to use any of the freely available disk images without modification. You also should be able to use the SIMH Tape IO facilities to create your own disk images. For complete information, please visit: http://www.techtravels.org/KS10FPGA/ Rob Doyle doyle (at) cox (dot) net

11 years, 7 months

CFFA3000 and Apple III?

by wheagy＠gmail.com

A quick update on my Apple III. I used the BNK, ADR and Exp/Got info from the Apple III RAM test to narrow down the bad RAM chip. I replaced it with one from an Apple II and it worked. The RAM test completes successfully, but it does do one odd thing shown in this pic... http://i.imgur.com/VP98h.jpg Row 7 gets dashes across it during the second pass and all subsequent passes. The test, however, continues normally. I ran it over 10 passes with no problems. Any ideas what the dashes mean? On the downside, my III still doesn't boot. It does pretty much what it did before. WIth an SOS disk in the drive, it spins for about 3 seconds, then nothing. The demo disk does the same thing. The III+ diagnostic disk that used to boot, doesn't boot anymore and fails with an IO error message. This makes me think again that there may be a floppy drive issue. Is the drive calibration method that was mentioned previously the one that is outlined in the Sun Remarketing Do It Yourself Guide for adjusting Apple III drive speed...that uses a 60 Hz light source? If so, I guess that's my next task to try to revive this machine. Thanks, Win

11 years, 7 months

Hobbyist CP/M home brew computer PCBs available!

by LYNCHAJ＠yahoo.com

Hi If funds and/or PayPal is an issue, I am willing to barter items instead. We can make trades for certain computer parts, electronic components, tools, metals, coins, unused gift cards, shipping materials, scrap, etc. Please let's discuss! Many times I have just sent (gratis) PCBs to known N8VEM builders especially those working on tough problems or less popular areas that need attention. Times are tough for many these days. Please don't let a lack of cash or issues with PayPal limit your participation. Thanks and have a happy holidays! Andrew Lynch

11 years, 7 months

DEC LAVC SCA Specification

by robert.jarratt＠ntlworld.com

I have been trying to find if there is a published spec for the DEC LAVC SCA protocol. The reason I want to find it is that I want to see if I can work out why my MicroVAX II is failing the net boot, it times out after a while and falls out of the cluster. I suspect I have a hardware problem, but would like to use a packet sniffer to work out what is going on. Is such a document available? Regards Rob

11 years, 7 months

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test-drb January 2013