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I am going mad trying to find a source for 2 passive delay line modules - this type of thing, looks like a logic chip, but is not. These are part of a S100 RAM card and they are linked to the memory timing. The bill of materials lists : 9825 possibly made by “Pulse”. Which I think is a...

I saw this in a box of modems and agp cards, is it what I think it is ? (IMSAI 8080, S-100 cpu/mpu). Seems to be missing CPU and some other chips, and there is some rough soldering arround the power ic. Cost me $1 + tax.

Sorry if this has been covered before, but I'm stumped (again): I did go through the minuszerodegrees.net site to learn what I could before posting. here I have an IBM 5170 connected to IBM 5153 monitor using the IBM EGA card 64kb memory. The card switches are set to give CGA (0001). The...

I just got this 5150 back to life, I'm running the IBM diagnostics disk 1.x and it gives me error "432" - all is not right with my parallel port on the display adaptor. There is nothing connected to the Parallel port, does this test always require a loopback adaptor ?

I'm trying to read and backup several UV erasable 2716 EPROM chips from a late 1970's/early 80's homebrew system. my objectives are: 1, read the 4 chips on the CPU card to see if there is anything there still. i.e. SWTBUG, MIKBUK, 9BUG, (monitors) 2, archive anything that is on there just in...

I was extremely lucky on craigs list and found this wonderful hombrew SS-50 system from the original maker, a very nice guy who spent an hour explaining the parts to me. I began the cleaning and checkout process, stripping it down to remove the spiders etc. Before I try and power it on. The...

After a couple of fruitless evenings googling I’m back here begging for help. The Z-148 has a third party expansion board, like this pic, “premier technologies, inc” board is Z148X , the rtc chip is MSM58321. I’ve tried several of the clock applications from the rtc section on...

I need help on a PSU capacitor. Some background, I aquired a fantastic Heath PC, from a guy on craigslist, apparently a kit built by his father. A really nice find, with manuals, disks, monitor and keyboard. $50! I immediately took the cover off to check the insides like a kid at christmas...

My baby just goes waaaaaaah continuously when I power it on ! (Continuous tone from the speaker when I flip the power switch) Things I have tried: 1, extract, deoxit, re-seat all ram chips, CPU, Bios chip. 2, tried a different power supply. 3, post diagnostic card gives voltages on the isa...