I have inherited a pair of 48k Sinclair ZX Spectrums. First a series 2 with (at least) a bad ULA and a lifted trace to the Z80, and a series 6a with nearly everything fried… Believe it or not, I think I stand a better chance of getting the 6a running, so I started with that one.
A good while back, I picked up a somewhat crusty Compaq SLT/286 “portable” with an azerty keyboard for $20. The owner sold it saying that the laptop wouldn’t fire up, the power supply just blinked a green LED, and that was it. I was just happy to add a 286 to my collection, and for the of fun trying to bring it back to life!
Well, today I found a folder on my phone with all the pictures I took, a) so that I could put the damn thing back together, and b) for that big long article I was going to write about the fix process. (haha)
Instead, here’s a 65 image pictorial, with some random comments, an RTC battery repair, and some useful SLT related links.
When I got my C64, it did not come with a power supply or video cable. A friend loaned me a power supply, but I had to wait weeks for my video cable to arrive from eBay. In the meantime, I was struggling for a way to get video, until I found this page shows the pinouts for the C64 AV connector. Helpfully, pin 4 on this connector is a composite out signal! So I made this quick video mod to get composite video through the RCA RF jack on the back of the C64 while I waited for my AV cable to arrive.
While I wait for parts for my recalcitrant ZX Spectrum, I turned my attention to a sick Commodore 64 bread bin model 250407 that I picked up from a friend. As with the ZX, at first this C64 didn’t boot at all. (no video, no power led… nothing) And once that was fixed, it only booted to a black screen.
At least this C64 does not look like it had any work done internally. The soldering on the bottom looks factory, and there’s no messy flux residues. Both the SID and VIC chips are socketed, but I think this generation all came this way.
I have a loaned power supply for this board, which is a dodgy original outputting 10.6VAC on the 9VAC line, and +5.2V on the 5V DC line. Not great, not terrible, and it’s definitely going to be replaced with a modern version down the line. For now, and for testing, it will do…
My repair video for my IBM 5150 motherboard (64k-256k) model and IBM 5.25″ full height floppy drive (Tandon TM100-2A). As usual, I apologize to everyone for my terrible video editing skills. Audio is all over the place on this one, and at one point the video goes vertical.
