>>>>> "Marko" == =?ISO-8859-1?Q?Marko M=E4kel=E4?= <ISO-8859-1> writes:
MV> My SX motherboard (PNO 251102 REV A) has a 28 pin socket for the
MV> kernal ROM, which is a 2654 EPROM. The schematics lists UD3 as
MV> being either a 2364 or a 2564.
Marko> What is a 2564?
8k*8 EPROM.
Marko> Is it pin-compatible with the 2764?
No. You can find the pinouts in the Chip Directory, e g
http://margo.student.utwente.nl/stefan/chipdir/pin/2564.txt
It's almost pin compatible with the 2364. It's easy to make a 28-pin
socket that can take either a 2564 or a 2364 without jumpers or
rewiring, and this is what CBM did with the SX-64 socket. The 24-pin
JiffyDOS kernal worked just fine.
MV> I'm asking because I can't seem to find the correct pinout for the
MV> 2364.
Marko> Try the C64 schematic diagrams from ftp.funet.fi. And if you do
Marko> so, please let me know, what exact pins are wrong in the 256kB
Marko> memory expansion docs.
Found it:
http://ftp.funet.fi/pub/cbm/schematics/computers/c64/252278-1.gif
(slightly to the left and below the centre of the picture)
http://ftp.funet.fi/pub/cbm/schematics/computers/c64/sx-64/251103_l.gif
(middle right)
both list pin 21 as A12. The expansion docs lists it as /CS2.
--
___ . . . . . + . . o
_|___|_ + . + . + . . + + Per Olofsson
o-o . . . o + MagerValp@Goth.Org
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