C-128 Garbage screen in 40 column mode
I have a C-128 that boots up fine in 80 column mode displaying the correct number of bytes free. In 40 column mode in either 64 or 128 mode, I get borders full of characters. The VIC chip tests ok. Any...
View ArticleCommodore PET CBM 4016 ASSY 8032080 RIFA burn and more
Dear all, in the process of trying to repair a PET, I had a smoke development and FI / RCD breaker tripping event. The suspected RIFA that burned was removed but the PET would still not run just like...
View ArticleA tip for those designing new hardware for vintage machines...
If you're going to design new hardware to use in 30+ year old machines, maybe build it to last a bit longer than 2 years. I know I'd be extremely embarrassed if I designed, built, and sold a product,...
View ArticleC64C Black Screen
Hey fellow Commodorians! I've taken up repairing C64s and have two successes under my belt but this one is confusing to me. I'm using a well built Power Supply from Ray Carlsen for testing so for...
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Disassembling a Sony Vaio PCG-505 battery?
Hey folks. I can't figure out how to disassemble these batteries (so as to rebuild them with new cells) without destroying them. I think they may be ultrasonically welded. Both the standard capacity...
View ArticleMicro 8088 - Kits Interest
I am wondering if people here would be interested in Micro 8088 kits? Possibly the following options: 1. Micro 8088 PCB + chipset - I already did this in the past, and it was some interest. $30 +...
View ArticleEnsoniq EPS classic repair. 68k cpu
Hello, I'm trying to repair this vintage synthesizer and could use some help. Tons of technical info on it here http://zine.r-massive.com/ensoniq-technical-documents-and-schematics/ The story so far...
View ArticleMAI Basic Four Terminal (7250) for Parts (No CRT, case or keyboard)
I recently rescued what appears to be most of a MAI Basic Four Terminal (model 7250, ~1980) from the local e-waste. The parts had been tossed loosely into a box, but they included the power supply,...
View ArticleMindscape Music Board with Bank Street MusicWriter
Dear Forum Members, Time to make room for new vintage gear and find a new home for one special sound card. Selling a 1987/1988 Mindscape Music Board with Glen Clancy's Bank Street MusicWriter software...
View ArticleBox and Packaging for Roland MPU-IPC-T
Dear Forum Members, Selling box and packaging for a Roland MPU-IPC-T (MIDI Processing Unit for IBM PC, XT, AT). Perfect for completing a system for a CIB-type vintage collector. Item located in...
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New 8-bit ISA SCSI Card - ASPI driver needed
Hello, i made a clone of a NCL501 SCSI card (see github: LINK). Unfortunately it is a very poor design (at least from the driver side) it has many limitations and i still haven't found an ASPI driver....
View ArticleCromemco JS-1 Joystick Replica
So to go along with the Dazzler replica we've been working on, I'd like to get a couple of joystick "consoles" to go with it. I plan to have a Dazzler exhibit at VCF Midwest and think it would be great...
View Article***WANTED MACINTOSH SE***
I was wondering if anyone had a Macintosh SE to spare? I have been looking for one for quite awhile and have not been successful in finding one, if anyone has some info that would be great!
View ArticleMac Classic II ROM chip testing
Some years ago (~10) my Macintosh Classic II working Ok, but now when power on - "standart" chekboard, no surprises. Computer board now is recaped, but is still checkboard on screen. When in my Classic...
View ArticleSperry HT 3070/09 no video signal + manual request
Sperry HT 3070/09 turns on, but gives me no video signal and error beeps I get during post is: "1 long beep 5 short beeps". I have no manual for the computer, so I have no clue what is the issue with...
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MS-DOS 4.0(1) Opensource on Github
Microsoft has released the source code of MS-DOS 4.0(1) on Github. Also older versions previously released are there. GitHub - microsoft/MS-DOS: The original sources of MS-DOS 1.25, 2.0, and 4.0 for...
View ArticleIBM 5110 initial info
I've begun exploring into a working IBM 5110. Notes and photos available at... IBM 5110 Notes https://voidstar.blog/ibm-5110-notes/ I'd like to explore if a tape interface for this system could be...
View ArticleInsight into IBM software (5110/5120 by the mid-1980s)
I recently came across an IBM 5120 that included a bunch of documentation. Sifting through some of that, I came across an IBM "notice to customers" document that was notifying about software price...
View ArticleCompaq Portable 486c
I know they are rare, but if anyone has one for sale it can't hurt to ask. My budget is whatever it's worth to you (within reason).
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