That's super interesting. ?I wonder what the numbers are on the Z80MC for the elimination of the FAT layer relative to direct block I/O. ?I would guess that a majority of the time is spent in the bit-banged SPI, which might swamp out the benefits, but you never know until you measure... ?(and maybe ram/rom savings alone makes it worth it).
Anyway, if you have code, I wouldn't mind seeing it. ?I am Z80 competent, but a CP/M dilettante, so I'm sure I would have knumbskull questions.
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-dave
dave