Galivan - Cosmo Police Bootleg
I picked this up in a bunch of random untested boards and set it up on the test bench.
There's no schematic available that I could find, the pinouts and dips are available though.
When I powered it up most of the title screen is missing , there are just the moving stars.
In test mode there is no text and when a game is coined up and played there is no score.
The rest of the game seems to play fine, all sounds good and no issues with the background and characters.
[tube]0ZAQKFu8O7g[/tube]
With no schematic and the game playing relatively fine I started at the ROMs.
I found all outputs on ROM [D] were stuck high, there was no difference on screen when the chip was pulled, the game played the same. Pins were cleaned and inspected and look good. The 74LS257 got a pulse when the game goes to tile screen but the inputs are mostly high.
I have made the determination that the ROM is bad buy can't confirm this until I have a progammer (won't be long).
I'll shelve it until then.
Kaizen0882017-04-14 05:54:35
I picked this up in a bunch of random untested boards and set it up on the test bench.
There's no schematic available that I could find, the pinouts and dips are available though.
When I powered it up most of the title screen is missing , there are just the moving stars.
In test mode there is no text and when a game is coined up and played there is no score.
The rest of the game seems to play fine, all sounds good and no issues with the background and characters.
[tube]0ZAQKFu8O7g[/tube]
With no schematic and the game playing relatively fine I started at the ROMs.
I found all outputs on ROM [D] were stuck high, there was no difference on screen when the chip was pulled, the game played the same. Pins were cleaned and inspected and look good. The 74LS257 got a pulse when the game goes to tile screen but the inputs are mostly high.
I have made the determination that the ROM is bad buy can't confirm this until I have a progammer (won't be long).
I'll shelve it until then.
Kaizen0882017-04-14 05:54:35