Description
Selects cartridge banks, hw chips, osrom, BASIC rom. In older machines had
no Atari number, was PAL16L8.
Catalogue numbers
CO60609 (1200/1400)
CO61618 (XL/XE)
C101686 (XEGS) = 16L8
Pinout (CO61618)
| /MAP | IN from PB7 - low selftest on, hi selftest off |
| RD4 | IN from cartridge port |
| RD5 | IN from cartridge port |
| REN | IN from PB0 - low OS off, hi OS on |
| /REF | IN refresh |
| /S5 | OUT cart bank select |
| /BASIC | OUT basic rom chip select |
| /MPD | IN MPD PBI |
| /OS | OUT OS rom chip select |
| /CI | OUT CAS inhibit |
| /IO | OUT goes to 74LS138, selects hw chips (Y0 - GTIA, Y2 - POKEY, Y3 - PIA, Y5 - CCTL) |
| /BE | IN from PB1 - low BASIC in, hi BASIC out |
| /S4 | OUT cart bank select |
Here is PAL (2 KB SRC) source by Bob Woolley and
GAL (0 KB SRC) source from Erhard Puetz. I didn't
check them for correctness (which means nothing... :)
Back (c) 1998-2004 Jindroush Last modified: Mon Jun 3 22:49:10 2002
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