Non-functioning ZX81 with extremely hot Z80

[Moggy]

But silver does goes black over time. So as silver plating was popular for a while, I wonder if it is either silver plating or an alloy that includes silver.

Mark

Now that makes perfect sense Mark and come to think of it I've seen old arcade boards go like this.

[Tezz]

That certainly makes sense. I've seen it a lot on various chips and systems too, I often see it with the 4116 lower RAM chips on the Spectrum for example.

[Tezz]

Well, I went ahead this morning and desoldered the suspect Z80. I installed a socket and popped in a known working NEC compatible Z80 and the '81 now starts up to the K. I'll need to add a composite video circuit to test everything fully next week however as I can't get a stable picture with this old ULA and RF output to see what I'm doing.

[Moggy]

Great news Tezz, one step further towards another working zeddy.

[1024MAK]

Good work

Mark