SMS VDP Glitch

Started by FamiGamer86, October 18, 2015, 04:57:50 am

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FamiGamer86

There seems to be a glitch with my Tonka era SMS, where it sometimes repeats part of the sprite data regarding certain sprites. Some trace might be broken, I don't know.
So I once shipped an item with SAK (Below Economy Airmail) instead of SAL or EMS. I had to retrieve the package from the Amazon rainforest. The system was a bit dirty, but still worked. Never ship anything with SAK, because they ship packages from JOS.

jensma


xIceMan

Knowing there's a glitch doesn't help us what's causing it. If you know it's a broken trace then it should be easy to repair. Sounds like a WRAM problem to me though. Might have to replace it.
Screenshots would help though!

FamiGamer86

I think this is a good example of the problem
So I once shipped an item with SAK (Below Economy Airmail) instead of SAL or EMS. I had to retrieve the package from the Amazon rainforest. The system was a bit dirty, but still worked. Never ship anything with SAK, because they ship packages from JOS.

famifan

on which basis is it reproducible? per the whole system with any game inserted or just per certain amount of cartridges?

it might be access speed degradation of particular IC inside of system/cartridges.

FamiGamer86

October 19, 2015, 10:10:22 am #5 Last Edit: October 19, 2015, 11:54:26 am by FamiGamer86
It happens with Marksman Shooting & Trap Shooting, where the scores of the targets I hit also also look weird, as I can only see part of them.
More specifically, it happens with the Marksman Shooting part.
So I once shipped an item with SAK (Below Economy Airmail) instead of SAL or EMS. I had to retrieve the package from the Amazon rainforest. The system was a bit dirty, but still worked. Never ship anything with SAK, because they ship packages from JOS.

2A03

You sure it's not a VRAM issue? That would be way more likely than the VDP itself being bad.

FamiGamer86

So I once shipped an item with SAK (Below Economy Airmail) instead of SAL or EMS. I had to retrieve the package from the Amazon rainforest. The system was a bit dirty, but still worked. Never ship anything with SAK, because they ship packages from JOS.