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added ROM chip information
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== Replacement Parts ==
 
== Replacement Parts ==
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=== ROM Chip ===
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AMD AM27C512 (unknown speed)
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Some people online claim to have an AM27C256 (which is half the size) instead?
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[https://www.digikey.com/en/products/detail/rochester-electronics-llc/AM27C512-70DC/12606925 AMD AM27C512-70DC | DigiKey]
    
=== Non-volatile SRAM Chip ===
 
=== Non-volatile SRAM Chip ===