On Apr 21, 11:17 pm, Steven Hirsch <snhir...@gmail.com> wrote:
I'm a little confused... Haven't a bunch of folks reported plugging a 65816
directly into a 6502 socket - with a pin bent out? Or, did they all really
mean to say 65802?
Looking at the IIe circuit, it looks like simply disconnecting pin 1
would indeed work because the Apple IIe leaves pins 3,5,35,36,38 and
39 unconnected. A II+ on the other hand uses pin 3 (to disable the
data bus buffers) and grounds pin 38.
If you had a card that used the uP SYNC signal (pin 39 of the
peripheral bus) then the VPA signal from the 65816 would not be a
suitable replacement. As the Apple II(+) had USER1 on that pin and the
IIgs has /M2SEL I don't think that many cards would need it.