I have an issue 3 here that I have been working on, initially the 7805, TR4, TR5 and a hand full of electrolytics were done for. Having replaced all of those I was faced with an apparent lower ram issue. So that was all replaced, but still no dice.
I did some probing around and noticed that I seemed to be getting CPU CLOCK on A0 on the ROM. I have removed all ICs, lifted R25 and removed TR3 to try and isolate the short and it still persists.
Anyone got any pointers on where to look next?