Recent content by shoestring

Same, it was the first Arcade PCB I worked on and the most frustrating given the little experience I had back then.

Disregard. Degaussing seems to have resolved the issue.

Picked up a PAL 1701 (240V European model) that was suffering from frame collapse, now resolved after replacing a few failed components. Just waiting on a replacement shielded speaker, as the original failed open. I'm feeding composite video from the 240p Test Suite via MiSTer, and there are...

Try another monitor.

Couple of bug fixes and changes to rom names.

Thanks for that. They are indeed bootlegs but I was able to compare one of the board types to an original KONAMI for sale on eBay. Socket locations are the same as they are in Hyper Sports diagnostic ROM goes into socket G15 as the filename suggest.

Hi All. I've been holding on to this for awhile but have been meaning to share it. Here's an early version. Currently only handles power up tests whilst I figure out how to cram in the diagnostic mode display of the program on a rotated/vertical screen. Finding it a little difficult to get a...

What a fun way to learn 6809 asm. I cut my teeth on the 6809 when I developed the T&F test rom.

Good job.. (y)

You have to set one of the DIP switches ( DIP 8 of SW2 ) to to test the NVRAM, this is intentional because some people want their high scores intact. Also I am unable to read all the labels on the EPROMs on your logic board. Don't think that's your problem though, check the nvram.

You can post your question in there and you should definitely get some responses, there are several people in the U.S repairing this era of Konami boards.

Check the 'Who repair's what?' thread.

Thanks for the shout-out @channelmanic It was worth the effort disassembling the Hypersports rom I wrote ( after losing the source code ) and re-working it but still need to get around to finishing the diagnostic mode.

character lookup prom + bad ram/rom

I know this is a long shot but have you verified the sprite roms, data output & enables ? My test rom can't evaluate those. Normally you would expect some artefacts but you just never know.