Sinclair ZX80 / ZX81 / Z88 Forums

Just to verify before I burn the ROMs.... the Spectrum +2A/+2B/+3 physically have 2x 32k ROM chips, usually referred to as A and B. I know that they consist of 4 banks of 16k ROM data.

Am I right in thinking that ROM A contains 16k ROMs 0 and 1 (with 0 starting at the beginning and 1 in the 2nd half) and that for ROM B it's the same principle, with the first 16k space taken up by ROM 2 and the last 16k being ROM 3?

Thanks.

Here is the inside of a +2A currently awaiting attention. Looks like two ROMs.

Up close if required:

Yes, thanks Lardo, I know that there are two but they come as 4x 16k, so just wanting to confirm the correct order that they get burnt onto the chips.

Not sure if this is accurate:

https://packages.debian.org/jessie/spectrum-roms

And some disassemblies.

http://www.fruitcake.plus.com/Sinclair/ ... embly4.htm

Just to make sure, I'm going to compare the ROM code of my original A&B to verify the 0-3 order.