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polbit · 01-30-2018, 02:58 PM

(01-30-2018 02:31 PM)rprosperi Wrote:
(01-30-2018 02:07 PM)polbit Wrote: If using a 64K EPROM, is it possible to burn JPC ROM, Math Module ROM, and some individual LEX files?

Yes it is, however the CMT 64KB EPROM is actually 2 separate 32KB chips, so you will end up with 2 x 32KB PORTs, e.g. if inserted in port 2, they would be seen as :PORT(2) and :PORT(2.01).

So you will need to load JPC ROM into 1 bank, and MATH ROM* into the other, but both will have room for additional files.

* Note: The original MATH ROM used a full 32KB ROM image, even though the actual LEX file length is only 27,682 bytes (the image was zero-padded to fill out the full 32KB). Shorter versions of the file have been created to provide more space, to allow more LEX files to be loaded, as discussed here.

In the archives, the original 32K LEX file is generally named MATHROM, while the reduced 27.5K file is named MATHLEX.

Note this discussion about 64KB CMT EPROMs is different than if you have a 64K RAM module (e.g. in EMU71, or with FRAM, etc.) in which case this 64KB is accessed as a single port, while CMT and/or HHP 64/96/128/160KB RAM modules have the same 32KB port restrictions as the EPROM, so each physical module is addressed as multiple ports as described above.

Perfect, thanks for the explanation! Now I just have to figure out all the additional LEX files, and then ask Dave for his generous help with burning.