28-08-2021, 02:43 PM
So it's a week later and I now have a working PC85.
Brad over at MSPP posted a couple of tips and tricks, and following his lead, I checked IC26 with my logic probe, and where there should have been logic was nothing. Out it came and in went a socket and a replacement and... it works!
Woohoo!
I also slapped a decent heatsink on the 5v regulator. I haven't yet got around to organising a 10V PSU, but I have a cunning plan! I'll replace the power in socket on my harness with a tiny jiffy box containing a switch (to make control easier) and a big power diode (with a 1.2v drop across it) inline to bring the voltage down to 10.8v.
After this, I need to see what went wrong with my second ROM image in the PAK10 slot. It shows in the self test so I must have incorrectly made the image. (I am feeling spurred on by ChickenMan's recent work to have a couple of games in my empty ROM slots)
Down the track, I'll also get a case made for it. I'm thinking clear acrylic :-D
Thanks to everyone who made me keep pushing to get this done. I guess, after this, I should see if I can get the ROMs for the older of the three working. From zero to three 'bees in under 3 months? MADNESS!
Chesh
Brad over at MSPP posted a couple of tips and tricks, and following his lead, I checked IC26 with my logic probe, and where there should have been logic was nothing. Out it came and in went a socket and a replacement and... it works!
Woohoo!
I also slapped a decent heatsink on the 5v regulator. I haven't yet got around to organising a 10V PSU, but I have a cunning plan! I'll replace the power in socket on my harness with a tiny jiffy box containing a switch (to make control easier) and a big power diode (with a 1.2v drop across it) inline to bring the voltage down to 10.8v.
After this, I need to see what went wrong with my second ROM image in the PAK10 slot. It shows in the self test so I must have incorrectly made the image. (I am feeling spurred on by ChickenMan's recent work to have a couple of games in my empty ROM slots)
Down the track, I'll also get a case made for it. I'm thinking clear acrylic :-D
Thanks to everyone who made me keep pushing to get this done. I guess, after this, I should see if I can get the ROMs for the older of the three working. From zero to three 'bees in under 3 months? MADNESS!
Chesh
John "CheshireNoir" Parker
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One Dark Little Kitten
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One Dark Little Kitten
