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Galaxian - Moon Cresta - Scramble Test Roms

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Galaxian - Moon Cresta - Scramble Test Roms by philmurr  


There has been a Galaxian test ROM freely available for years and it does a really good job testing programme, object and video RAM on Galaxian boards.

As there are a number of games that run on hardware very similar to Galaxian, I've been able to modify the Galaxian test ROM code and have made versions to test the RAM on Moon Cresta and Scramble boards. (It won't test the object RAM on Scramble as that is read-only, as I found out today - Mame doesn't emulate it properly). I've also tidied up the code in the original Galaxian ROM as there was a lot left in there that was never used.

I've added a way of "testing" the attack or sprite RAM into the 2nd set of test ROMs. Again you can't read from this RAM but can only write to it. But unlike the object RAM where there isn't an easy way of seeing a fault, I've written a routine which relies on the user visually checking something is happening in order to test the sprite RAM.

The games can have up to 8 sprites on the screen (strictly speaking 7½). My routine displays 1 sprite and has it falling from the top of the screen to the bottom, then adds a 2nd sprite doing the same, until we have all 8 (7½) on screen and falling. It then repeats forever. If you see anything other than a regular pattern, suspect the sprite RAM as being faulty.

Burn the file you want to a 2716 and replace the first ROM on the board you're testing.

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    Galaxian - Moon Cresta - Scramble Test Roms by philmurr  

    There has been a Galaxian test ROM freely available for years and it does a really good job testing programme, object and video RAM on Galaxian boards.

    As there are a number of games that run on hardware very similar to Galaxian, I've been able to modify the Galaxian test ROM code and have made versions to test the RAM on Moon Cresta and Scramble boards. (It won't test the object RAM on Scramble as that is read-only, as I found out today - Mame doesn't emulate it properly). I've also tidied up the code in the original Galaxian ROM as there was a lot left in there that was never used.

    I've added a way of "testing" the attack or sprite RAM into the 2nd set of test ROMs. Again you can't read from this RAM but can only write to it. But unlike the object RAM where there isn't an easy way of seeing a fault, I've written a routine which relies on the user visually checking something is happening in order to test the sprite RAM.

    The games can have up to 8 sprites on the screen (strictly speaking 7½). My routine displays 1 sprite and has it falling from the top of the screen to the bottom, then adds a 2nd sprite doing the same, until we have all 8 (7½) on screen and falling. It then repeats forever. If you see anything other than a regular pattern, suspect the sprite RAM as being faulty.

    Burn the file you want to a 2716 and replace the first ROM on the board you're testing.

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