I'm looking for some help on an issue I'm having with my multi. I just got this recently from HighScoreSaves and got it installed on a known-good A-Board. All games I've tried seem to work well except MERCS (all regions) -- and some of the hacks that I understand used bootleg boards (previously discussed). I saw that was on the known issues list, but it mentioned only beginning in the second level where I'm seeing it as unplayable - most sprites seem to work but backgrounds are totally corrupt - I can't see the characters after starting the game either. Any advice would be much appreciated, I'd be happy to test anything you need to track down the issue. Photos attached on my setup and screens on the game to exhibit the issue. I'd be happy to also grab a video if needed to show things further.
Basic setup:
- DASH 12Mhz A-Board known working and tested with SF2HF B/C boards
- Darksoft Repro C-Board
- HAS Supergun w/HAS Extender
- Meanwell RT-65A PSU
- Roms from the "multipacks" archives, SD cards formatted with SD Card Formatter then formatted FAT32 with guiformat.exe, then the files on the card sorted with FAT Sorter (all on a Windows 11 PC)
- Updated the multi to the latest firmware (the one that was released to fix the Mac SD card issues)
- All DIPS in the OFF position
What I've tried:
- A backup known-working DASH 12Mhz A-Board (tested with my SF2HF B/C boards)
- A backup Darksoft Repro C-Board
- 3 different SD Cards (Samsung EVO Select 256GB SDXC, SanDisk Ultra 64GB SDXC, TEAM 8GB SDHC (from DE10Nano))
- Confirmed 5.00v at the extender voltmeter (and on the jamma edge)
- Cleaned all socketable chips and sockets on the A-Board with contact cleaner, IPA, Deoxit
- Both A-Boards were previously fully recapped with Nichicon caps and tested
- RE-cleaned the JAMMA edge on both A-boards that I tried
- Reseated the filter board, multi-board, and c-board multiple times
- Tried all three region packs to confirm if the issue is with one specific bad ROM (all MERCS roms in all regions seem to exhibit the issues)
- Ran the CPS Diagnostic rom, showed no issues with either A-board
- Double checked all dips are set to OFF on both A-boards that were tried
Thanks in advance!