An 8K variant of this would be very useful to replace dead BASIC and KERNAL ROMs.
(mod: topic drift split from "WIP: VIC-2020 MINIMON cartridge")
Moderator: Moderators
Woah, cool! Could that adapter board be used in place of a 2764? (I know that your cartridge isn't wired for that, but assuming it's put in a socket that would otherwise be occupied by a 2764...)
The AT28C64B in charge here actually *has* a capacity of 8 KB and is also available in a 28-pin DIP. I use the TSOP version for MINIMON, mainly because it nicely fits into the surrounding 24-pin DIP adapter.chysn wrote:Woah, cool! Could that adapter board be used in place of a 2764? (I know that your cartridge isn't wired for that, but assuming it's put in a socket that would otherwise be occupied by a 2764...)
Edit: Oh, right, not enough pins. Question withdrawn
Main issue when this EEPROM is supposed to replace BASIC or KERNAL: the ROM sockets do not provide a R/W line, and the /OE signal also needs special treatment during write, so you could not easily (re-)program the chip in place.srowe wrote:An 8K variant of this would be very useful to replace dead BASIC and KERNAL ROMs.
For sure there exist quite some options to replace BASIC or KERNAL ROM when they're defective (or for other reasons already stated). For people who want a 24-pin DIP footprint without adapter, there's the Motorola MCM68764/66, Cypress CY7C264 or Signetics 27HC641.MCes wrote:I replaced ROMs with this: [...]
I have 27HC641 and I can flash them for who need it