maple classic™ @squirrel@computerfairi.es

and the other IC does this https://computerfairi.es/media/luyk4fdhLVhOrP_-fo4

so the counterfeit IC almost worked out...

i got r, g and sync fine but no b

and i didn't socket it either, ugh

so i'm getting red, green and sync alright from the counterfeit IC, but no blue

blergh

and this was after i tried it the first time and i was seemed to be getting RGB fine, which means the counterfeit IC worked, so yay! but then i tried to hook up the composite video out as sync and accidentally shorted the board on a piece of scrap on my desk

maaaan, this sucks

i blew a 1uH inductor on the 5v input

i don't have any to replace it with

looks like this project has come to an abrupt halt unless i can salvage another one from anything else in my stuff

oops i accidentally blew up the 7805 in my master system

where's shekkie

should i cw my tech ramblings

the way china usually counterfeits these ICs is picking any one with the same pin count (in the case of the CXA1145, DIP-28), sometimes desoldered from a working system, filing away the original markings and etching the counterfeit IC number onto it. The chips I have are very obviously fakes, but since the pinouts seem more or less ok (R G and B pins all have the same resistance values, for example, and not a different random pinout) it might be pin-compatible.

so the counterfeit chip seems to have some sort of expected separation from expected vcc and ground pins (indicating resistance and/or logic instead of a dead short) so it should be safe to plug in, and there's an equal resistance between ground and each of the R G B inputs and outputs, meaning they should have the same sort of circuitry between them

looks like the counterfeit ICs might be usable after all... gonna solder it into the master system now

@bea h-hii...

*swoons*