>>>>> "MM" == =?ISO-8859-1?Q?Marko M=E4kel=E4?= <ISO-8859-1> writes:
MV> I haven't counted the number of Vic-20 ROMs out there, but in order
MV> to fit all of them in 1MB together with a menu program you'll
MV> probably have to compress them.
MM> Yep, if you remove the duplicates archived on funet, you'll get
MM> around 1,4 megabytes. When compressed with pucrunch, the whole lot
MM> takes about 8 kilobytes less than a megabyte.
Incidentally, that's just what you need for a little selection menu 8)
MM> There's no documentation on this particular project available.
MM> It's work in progress. The idea is to use a 1-megabyte ROM, maybe
MM> a MC 6821 PIA for bank switching, and some glue logic.
Is there a good way of getting the 6821 to a known default state on
powerup? If it's anything like the 6526 the PIA will be set to all
inputs and I guess you could just use a couple of pulldown resistors
to get them all to zero.
PS: if this projects gets to the stage where you make a couple of
PCBs, I'd love to be in on it :)
--
___ . . . . . + . . o
_|___|_ + . + . + . . Per Olofsson, konstnär
o-o . . . o + MagerValp@cling.gu.se
- + + . http://www.cling.gu.se/~cl3polof/
-
This message was sent through the cbm-hackers mailing list.
To unsubscribe: echo unsubscribe | mail cbm-hackers-request@dot.tml.hut.fi.
Archive generated by hypermail 2.1.1.