Hello everyone, haven't been active in the forum but I've been doing some repair work lately and I thought I'd post about it.
So I had a couple Waku Waku 7 MVS carts that didn't boot (went straight to crosshatch), I cleaned them and check for any continuity problems but couldn't find anything, then I noticed this weird circular mark on top of the P1 ROMs:
So I desoldered them and they both read as garbage, is that circular mark indicative of internal burning?
Somebody pointed me at 27C800 EPROM for a suitable replacement so I'll order some, I'll post a followup but it's going to be maybe a month before I get them in the mail
So I had a couple Waku Waku 7 MVS carts that didn't boot (went straight to crosshatch), I cleaned them and check for any continuity problems but couldn't find anything, then I noticed this weird circular mark on top of the P1 ROMs:
So I desoldered them and they both read as garbage, is that circular mark indicative of internal burning?
Somebody pointed me at 27C800 EPROM for a suitable replacement so I'll order some, I'll post a followup but it's going to be maybe a month before I get them in the mail