13 Mar
2003
13 Mar
'03
3:45 a.m.
>According to my 1983 Synertek book, the SY6507
_is_ a 28-pin 65xx CPU with
>8K addressing. The only video controllers they list are the SY6545, SY6845,
>SY66450 and SY66550.
Hi Jim
This is what Eric Smith tells me as well. As I told
him, it doesn't make much sense. The board has a 6502
as well as the 6507 with the data lines tied together.
I guess they could use opposite phases or something.
I was tracing down the sync signals for the video
and they seem to be coming from this part??
Now it would be interesting where they go. Maybe the
6507 CPU get's an interupt every line, or screen ?
Now I have a mystery to solve?
That's all what classic computing or computing in
general is about.
Gruss
H.
--
VCF Europa 4.0 am 03./04. Mai 2003 in Muenchen
http://www.vcfe.org/