>>>>> "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 - + + . http://www.cling.gu.se/~cl3polof/ - This message was sent through the cbm-hackers mailing list. To unsubscribe: echo unsubscribe | mail email@example.com.
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