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Looks like your tube convergence is off.
I thought the sprites ("motion objects" in Atari-speak) were the independantly movable graphics, like the centipede, the player's ship, shots fired, etc. This appears to be jacked up in the alpha-numeric graphic layer (look like there is only "playfield" other than "motion objects" in centipede).
I tend to agree that is doesn't look like a graphic ROM problem... I'd expect that to mess up the same letter in the same way each time it is displayed.
From the schematics: "The picture data ROM output D0-D7 on F7 and H/J7 are multiplexed by F8,H8, J8 and K8 and shifted out serially by H9 and J9. This serial output is latched by F9..." That's where I'd be sticking my logic probe first... (all but the ROMs F7 & H/J7)
Wow, you guys know your stuff. I feel like an ignoramus. I should know this stuff - I've got an EE degree. But I just played Gameboy in all my classes and never studied, so my degree is virtually meaningless.
So how did you actually pass for the degree then ?
Out of curiousity, would you want to sell that board? Feel free to PM me if so .. I'd be curious to take a look and see what's wrong with it (I love debugging obscure problems like this)Sorry, no it didn't. I just gave up and put in a different Centipede board.
Out of curiousity, would you want to sell that board? Feel free to PM me if so .. I'd be curious to take a look and see what's wrong with it (I love debugging obscure problems like this)
LeChuck