How much z80 and how much 8080 ?

Door PingPong

Prophet (3521)

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20-09-2019, 14:27

Hi all. To those have put more in contact with BIOS and MSX-BASIC in MSX's ROMs how much old 8080 code is here?
had M$ Guys took the idea of using z80 instructions to take advantage of z80? What about CP/M?

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Van nikodr

Paladin (744)

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20-09-2019, 15:07

I think this explains something about z80 and 8080a

Van Eugeny_Brychkov

Paragon (1145)

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20-09-2019, 15:36

MSX BIOS and BASIC is 8080 with some tailoring for Z80.
Note that you MUST preserve routine entry addresses as many applications are calling them directly, thus space saving will be questionable.