GeorgeSpinner
Grand Master
I recently purchased a Rastan bootleg board.
When the board arrived there were some issues with the graphics.
This thread over at aussie arcades was very helpful (here).
I cleared up the main reason I was having trouble. I had to replace a bad EPROM.
Being a bootleg, I had to figure out which rom belonged on the replacement EPROM.
The issue with it being a bootleg is that the EPROMs are smaller in size than an official Rastan; so there are more of them, and the information is split across them.
After many hours of looking at hex, I was able to construct the correct binary to use. It worked like a charm.
Finally being able to play the game, I sat down for some nostalgic fun.
At the end of level 2, on the boss screen, the foreground elements all DISAPPEAR.
Only the background remains. No score, credits, health gauge, or sprites.
Somehow, I defeated the boss like this.
On the 3rd level, the foreground elements were back, but at different parts of the level they consistently disappear again.
Does anyone have an idea what can cause this?
I have dumped all the EPROMs and I believe they are OK. '
There are some very minor discrepancies, but no more than 1 Byte in any file. I don't believe they are the cause, but I will try to use MAME to verify.
Does anyone know what can cause such a thing to happen? I am out of ideas.
How does 1 even troubleshoot something like this?
Any help is appreciated.
Thanks.
When the board arrived there were some issues with the graphics.
This thread over at aussie arcades was very helpful (here).
I cleared up the main reason I was having trouble. I had to replace a bad EPROM.
Being a bootleg, I had to figure out which rom belonged on the replacement EPROM.
The issue with it being a bootleg is that the EPROMs are smaller in size than an official Rastan; so there are more of them, and the information is split across them.
After many hours of looking at hex, I was able to construct the correct binary to use. It worked like a charm.
Finally being able to play the game, I sat down for some nostalgic fun.
At the end of level 2, on the boss screen, the foreground elements all DISAPPEAR.
Only the background remains. No score, credits, health gauge, or sprites.
Somehow, I defeated the boss like this.
On the 3rd level, the foreground elements were back, but at different parts of the level they consistently disappear again.
Does anyone have an idea what can cause this?
I have dumped all the EPROMs and I believe they are OK. '
There are some very minor discrepancies, but no more than 1 Byte in any file. I don't believe they are the cause, but I will try to use MAME to verify.
Does anyone know what can cause such a thing to happen? I am out of ideas.
How does 1 even troubleshoot something like this?
Any help is appreciated.
Thanks.
