5 Jul
2014
5 Jul
'14
8:02 p.m.
On Sat, Jul 5, 2014 at 10:23 PM, Jim Brain <brain at jbrain.com> wrote:
Just an update to note that I was successful in
reading the ROM out of the
MOS 6500/1 using the test mode. I used an ATMEGA32 to drive the opcodes
into PORTC, driving the RESET line to 10V, and reading data from the PORTA
on the unit. The opcodes loaded data from the ROM and put it on the PORTA
as output.
Perfect.
I dumped both the CBM 1520 Plotter ROM versions (-01
and -03).
Excellent!
-ethan