Hi,
I've got a strange issue with a very slightly rotten top board (the bit with the cartridge slot) on an MVS MV-1B, my guess is there is a trace broken somewhere but there isn't anything glaringly obvious. Swapping it for a known good top board fixes the problem.
The symptom is every pair of columns for the sprites is back to front.
The pixels should be:
1 2 3 4 5 6 7 8
Instead they are:
2 1 4 3 6 5 8 7
Here's some pictures of the problem on an Aero Fighters 2 cart. https://photos.app.goo.gl/FiCUiuf1kKVmUZya7
Does anyone know what pin or signal could be responsible for this? That'll hopefully narrow my search down from having to try and beep out 240 pins.
I've got a strange issue with a very slightly rotten top board (the bit with the cartridge slot) on an MVS MV-1B, my guess is there is a trace broken somewhere but there isn't anything glaringly obvious. Swapping it for a known good top board fixes the problem.
The symptom is every pair of columns for the sprites is back to front.
The pixels should be:
1 2 3 4 5 6 7 8
Instead they are:
2 1 4 3 6 5 8 7
Here's some pictures of the problem on an Aero Fighters 2 cart. https://photos.app.goo.gl/FiCUiuf1kKVmUZya7
Does anyone know what pin or signal could be responsible for this? That'll hopefully narrow my search down from having to try and beep out 240 pins.