3 Sep
2006
3 Sep
'06
9:16 a.m.
I distinctly remember that there was a book on how to
program the 1541
in order to do exactly this, and had lots of examples. I unfortunately
never owned it. I found it, at the time, in of all places, the Queens
Public Library. I tried to re-check it out several times, but the
Library wouldn't let me hold it any longer than about 2 cycles. :-)
This sounds like "Inside Commodore DOS" maybe?
An excellent book.
It might have been that same book or another, but it
had info as to how
to tweak the motor speed of the 1541 with a fluorescent light. The
motor had lines on it which would appear to be stopped under the light
of a fluorescent source at either 50 or 60Hz. (There were two rings of
lines, one for US, and one for Europe.) There was also a pot on the
1541 board that you could tweak to control the motor speed.
I don't remember this in Inside, might have been in Anatomy of the 1541.
Another trick was that if you had the Pet Emulator
(which wasn't a real
emulator, it just reshuffled video memory around to match the 4032's
memory map for video), and attached a small speaker to one of the pins
of the CIA which was the shift register output (I think this might have
been like CB1 or CB2 or something like that), you could also get Pet
like sound, but you'd have the change the poke addresses around to match
the CIA's. Was useful for all those old Pet games. :-)
This was kind of unnecessary though since the PET Emulator would pick up
POKEs into this range and map them into SID, so you got CB2 sound for free.
--
--------------------------------- personal: http://www.armory.com/~spectre/ ---
Cameron Kaiser * Floodgap Systems * www.floodgap.com * ckaiser at floodgap.com
-- I put the fun in funeral. --------------------------------------------------