Zimmers does have the 4k z80 bios as a separate image in the firmware directory. I thought the z80 source was in the wild, but I guess I'm mistaken. Perhaps it's hiding on one of thte cp/m disks? At any rate, the z80 bios is here: http://www.zimmers.net/anonftp/pub/cbm/firmware/computers/c128/z80bios.bin On Sat, Feb 25, 2017 at 8:38 AM, Marko MÃ¤kelÃ¤ <email@example.com> wrote: > On Sat, Feb 25, 2017 at 12:58:06PM +0100, Ruud@Baltissen.org wrote: > >> Is there a disassmbly of the Z80 ROM of the C128, used to boot CP/M, >> available? >> > > Actually the whole C128 boots up with the Z80. If I remember correctly, > the Z80 is checking the C= key and the -GAME and -EXROM inputs of the MMU, > deciding whether to switch to the C64 mode. Another (redundant) check is > done by the 8502. I happen to know this, because I made some minor tweak to > my C128 startup. I cannot remember what that tweak was, but I guess that I > could dump the ROM to find out. > > Marko > > > Message was sent through the cbm-hackers mailing list > Message was sent through the cbm-hackers mailing listReceived on 2017-02-25 16:00:02
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