Subj : Re: Jiffydos 6.01 Question on C128-DCR
To   : David Hoelzer
From : Anssi Saari
Date : Wed Jun 16 2021 11:34 pm

David Hoelzer <cyberdefensedave@gmail.com> writes:

> Hiya!
>
> I just purchased a ROM image set from RetroInnovations (I have emailed
> them and am still waiting for a response) for the 128-DCR.  The
> problem I have is that they come with absolutely no documentation.
>
> I'm assuming that the JiffyDOS_C128DCR_6.01.bin and C64_6.01.bin end
> up together in an EPROM in U32, but how do they get put together?  Or
> do they go somewhere else?

Looks to me U32 in a 128DCR should have the C64 basic and C64 and C128
kernals all in one chip. From the description on RetroInnovations it
seems like they ship only the kernals in separate files? So if your
JiffyDOS_C128DCR_6.01.bin is 16 kB and C64_6.01.bin is 8 kB then that
would seem to be the case.

So you'll need to combine a C64 basic with those two kernals for one 32
kB image. From a quick look at the C128DCR schematic and PRG it looks
like the high half of the ROM has the C128 kernal so the low half should
have the basic and C64 kernal. I don't know which order but I'd guess
basic first since it's first in the C64 memory map. Could be the other
way around too of course. Still, only two combinations to try...
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