What's new
By:

Clutch Hitter - System 18 issues

Darran

Darran

Student
Joined
Feb 1, 2025
Messages
16
Reaction score
17
Location
New Zealand
Recently acquired this Clutch Hitter System 18 board:

59d7ad17-33a5-4382-87fd-20675725aa2d.jpg

I've desuiced the board by replacing A4 & A6 with decrypted ROM's and swapping the processor out for a 68000:

09b15b93-3556-4823-9eed-d8d806f70e62.jpg


The game runs but the graphics are severely corrupted (same as when i first fired it up before desuiciding):

12919dc8-6955-4554-b034-f5e8d9bddb85.jpg


Anyone know where to go from here?
 
Do you have a second romboard or mainboard to test to diagnose where the issue is coming from?
 
Try dumping all of the ROMs and compare them to MAME. One or more of the graphics ROMs may be corrupted.
 
If you're sure that the main board is faulty then the cause could be many things. Try probing the graphics RAM from underneath the board with a logic probe and see if there's any stuck or floating logic lines. Start with IC33, 34, 35 and 36.

Also check for loose legs on the 315-5362 custom chip in the upper-left corner of the board.

I did some work troubleshooting graphics problems on a System 18 board a few years ago - you might find my writeup helpful:
https://shootthecore.tech/repair/repair-log-sega-system-18-arcade-pcb/
 
You must log in or register to reply here.
Back
Top