>>>>> "RDO" == Marcello 'R D O ' Magnifico <marcello.magnifico@rccr.cremona.it> writes:
BO> Some one has asked me to do a cartridge with 32K of RAM and the C64
BO> Kernal, BASIC ROMs for his MAX machine, on the assumption that, if
BO> it works in UMAX mode on the C64 it will work on the MAX machine (I
BO> don't have a MAX machine)
As long as mapping 32K of RAM in UltiMAX mode isn't a problem, I don't
see why. And as you said, it looks like all the necessary signals are
there.
RDO> I doubt that a single cartridge could replace both high (Kernel)
RDO> and low (Basic) ROMs.
UltiMAX allows you to map external ROM at $a000 and $e000, effectively
replacing the basic and kernal.
BO> Can any one think of any pitfalls? eg the Kernal hangs 'cause it
BO> can't find a second CIA to intialize or something.
Shouldn't think so -- I think the reset routine only writes to $ddxx,
but it's been a while since I checked.
RDO> An only CIA? Sheesh... Well, if you can find an emulator and can
RDO> turn off a CIA, you can easily see if it works. I LOVE emulators
RDO> because they're great in doing this sort of things (and more)...
RDO> :-)
Taking the CIA out of the socket isn't too hard either, but you'll
have to ground VA14 and VA15 or you won't have any video.
--
___ . . . . . + . . o
_|___|_ + . + . + . . Per Olofsson, konstnär
o-o . . . o + MagerValp@cling.gu.se
- + + . http://www.cling.gu.se/~cl3polof/
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