A
Apocalypse
Hi,
I got my hands on a faulty Sega Mega Play motherboard.
I'm pretty sure the custom chip 315-5433 (I/O chip) is faulty since a couple of data lines connected to it are stuck at a weird level (stable ~2.5V) when others are either low (0V) or high (5V).
I've pulled all other components connected on the same data bus (Z80 CPU, two RAMs, one LS745 buffer) and problem is still present.
I know this chip can be found in some Megadrive 1/Genesis 1 consoles with the TMSS message on boot up:
https://segaretro.org/TradeMark_Security_System
I don't own any Megadrive with that chip, seemingly motherboards rev. VA6 are to be targeted:
https://segaretro.org/Sega_Mega_Drive/Hardware_revisions
I also don't want to buy a working console and kill it for the repair, plus I've no guarantee I'll actually end up with the right revision motherboard.
So, does anyone here have this chip I could buy from in order to complete my repair?
I got my hands on a faulty Sega Mega Play motherboard.
I'm pretty sure the custom chip 315-5433 (I/O chip) is faulty since a couple of data lines connected to it are stuck at a weird level (stable ~2.5V) when others are either low (0V) or high (5V).
I've pulled all other components connected on the same data bus (Z80 CPU, two RAMs, one LS745 buffer) and problem is still present.
I know this chip can be found in some Megadrive 1/Genesis 1 consoles with the TMSS message on boot up:
https://segaretro.org/TradeMark_Security_System
I don't own any Megadrive with that chip, seemingly motherboards rev. VA6 are to be targeted:
https://segaretro.org/Sega_Mega_Drive/Hardware_revisions
I also don't want to buy a working console and kill it for the repair, plus I've no guarantee I'll actually end up with the right revision motherboard.
So, does anyone here have this chip I could buy from in order to complete my repair?