Hey guys, me again. Working on a 1979 fresh Atari Asteroids console. AR Board, PSU, and Monitor all rebuilt. Recapped the game board but it wont boot. Verifying the ROM chips in my mini pro shows at least one not close. Another two will read and are close but inconsistently read the same. As in I can read it, and immediately read it again and it will output totally different though close but different. The third chip consistently reads and verified perfect against the roms posted online.
What would make the chips not consistently have the same code? Half erased? They have stickers over the top of them to protect against light. And the stickers are dated 1979.
Coinsidently there are 4 ROM chips, the 3 not reading out right are AMD AM4716DC Chips dated 1979. The one which always reads correct is a TMS 2516JL.
Plus what chips can I use the are EEPROMS that my programmer can erase Rather than the type which requires light to erase.
Thanks for any info!
What would make the chips not consistently have the same code? Half erased? They have stickers over the top of them to protect against light. And the stickers are dated 1979.
Coinsidently there are 4 ROM chips, the 3 not reading out right are AMD AM4716DC Chips dated 1979. The one which always reads correct is a TMS 2516JL.
Plus what chips can I use the are EEPROMS that my programmer can erase Rather than the type which requires light to erase.
Thanks for any info!
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