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Need help fixing a couple of dead Olivetti/AT&T PC6300 power supplies. One is completely dead, with no 5v or 12v output. The other has +5v and +12v, but no -12V. Focusing on the completely dead one for a moment: I have the (poor resolution) schematic for the PSU. Unfortunately, the portions...

Trying to resurrect an AT&T PC6300 PSU, and found this cracked component. It looks like a resistor, but the words "BUSS 3 1/2 A" are printed on it. The stripes are Orange/Green/Red/Red, which would indicate a 3500 Ohm, 2% tolerance resistor. But the 3.5A words make it sound like a fuse. Is...

Picked up a couple of 3.5" FDD drives, and didn't notice until later they have 26 pins instead of the usual 34. Read some posts here in the forum about adapting a 26 pin cable to a standard 34 pin drive, and even see some ready made adapters online. Has anyone ever tried the opposite? Also...

My Osborne has an FDD daughter board that connects to the mobo via a standard 40 pin connector. It was so tight I had to use a spudger to get it off. Even then, it came off only 1mm at a time after using great force. Pins didn't appear bent or corroded; straight and shiny. Cleaned with isopropyl...

Hello all. Have been working on un-mothballing a Compaq Deskpro 386/25 I've stored away for 18 years. Entire system still works splendidly except one issue: getting it to properly recognize a 3.5 1.44MB floppy drive. The system sees the drive, but no matter what I've tried, the Compaq Setup...

I've seen lots of dirt, dust bunnies, goop and corrosion, but critters just creep me out! I finally opened up a couple of Osborne barn finds (literally) from a year ago, and each one made me jump for a different reason. Casadores? The first had this double decker cluster of mud dauber nests...

Have nice examples of both of these computers, but missing key parts. TI Portable Professional - Need keyboard Corona Portable PPC-400 - Have keyboard, but don't have the cover to close up the unit.

Recently acquired a 5150 with Hercules GB100 card in place of the IBM MDA. I've run the IBM Diag v2.2 tests on the system, and all checks out good except for the Video Card (option 1) and Video Sync (option 12). Everything text based looks nice and crisp. The Video graphics tests show a...

Recently scored a new Compaq Portable from craigslist. It came with an APSTEK SIC-1 clock/serial port card. See attached image. This card originally came with a clock utility (and perhaps other software), but I don't have them. Found some PC Mag ads circa 1983 about this and other APSTEK...

Hey all. I recently pulled my Compaq Deskpro systems out of storage, and the coiled keyboard cables are brittle and I'm having trouble even handling them without them crumbling. This is already a problem with the cable on my Portable III. Is there a way to recondition these? I'm thinking of...