25 Jan
2005
25 Jan
'05
5:02 a.m.
On Jan 25 2005, 9:11, Eric Smith wrote:
There are no specific documents on it. It's in
the MCS650x data
sheet.
It's just a 6502 die in a smaller 28-pin DIP
package with not all of
the
pins bonded out. Specifically, A12 through A15, RDY,
/NMI, SYNC, SO,
three NC pins, and one Vss pin are not available.
The pinout is:
/RES 1 28 Ph2 out
Vss 2 27 Ph0 in
Ph1 out 3 26 R/W
/IRQ 4 25 D0
Vcc 5 24 D1
A0 6 23 D2
A1 7 22 D3
A2 8 21 D4
A3 9 20 D5
A4 10 19 D6
A5 11 18 D7
A6 12 17 A11
A7 13 16 A10
A8 14 15 A9
That's a 6506 (above). 6507 is:
/RES 1 28 Ph2 out
Vss 2 27 Ph0 in
RDY 3 26 R/W
Vcc 4 25 D0
A0 5 24 D1
A1 6 23 D2
A2 7 22 D3
A3 8 21 D4
A4 9 20 D5
A5 10 19 D6
A6 11 18 D7
A7 12 17 A12
A8 13 16 A11
A9 14 15 A10
Note Vcc is one pin lower (in number). 6507 has one more address line,
no IRQ, and no Phi1, but it does have /RDY.
--
Pete Peter Turnbull
Network Manager
University of York