lncjb@cc.newcastle.edu.au (02/19/91)
In the deep, dark recesses of our Uni library, I uncovered a couple
of issues of "MICRO - The 6502/6809 journal". In one issue
it gives details on converting a Fat40 (4016-4032 PET, 12"
screen) to a "Fat 80".
It mentions a ROM upgrade, and has anyone performed this surgery?
I can get my hands on a Eprom programmer and I'm resonable
with a soldering iron, but I do need a copy of the upgrade.
Any old-timers :-) able to help? (Commodore? Fred.B?)
--- }`oo'{
`'
Chris "Polar" Baird
Impoverished BSc Undergrad @ Newcastle Uni (OZ!)
LNCJB@cc.newcastle.edu.auroot@zswamp.fidonet.org (Geoffrey Welsh) (02/19/91)
>From: lncjb@cc.newcastle.edu.au >In the deep, dark recesses of our Uni library, I uncovered a couple > of issues of "MICRO - The 6502/6809 journal". In one issue > it gives details on converting a Fat40 (4016-4032 PET, 12" > screen) to a "Fat 80". >It mentions a ROM upgrade, and has anyone performed this surgery? > I can get my hands on a Eprom programmer and I'm resonable > with a soldering iron, but I do need a copy of the upgrade. > Any old-timers :-) able to help? (Commodore? Fred.B?) The "ROM upgrade" would simply mean replacing the 2K ROM at $E000 with one that holds the 6845 parameters for 80 column operation and the OS code to do the windowing, etc. (in place of the 40 column ROM's screen line linking, etc.) The ROM should be obtainable from just about any 80 column CBM or SuperPET. Once that's done, you may have to do some severe adjusting to the control circuitry of the screen itself to resize it, etc. -- UUCP: watmath!xenitec!zswamp!root | 602-66 Mooregate Crescent Internet: root@zswamp.fidonet.org | Kitchener, Ontario FidoNet: SYSOP, 1:221/171 | N2M 5E6 CANADA Data: (519) 742-8939 | (519) 741-9553 The mile is traversed not by a single leap, but by a procession of coherent steps; those who insist on making the trip in a single element will be failing long after you and I have discovered new worlds. - me