DIP switch settings for the different versions of the PETRAM board. 0 means off and 1 means on. PET 2001 DIP switch 123456789 x-------- 1: Enable Flashmode -x------- 1: Enable ROM --x------ 1: Enable RAM ---xx---- 00: 4kB RAM 01: 8kB RAM 10: 16kB RAM 11: 32kB RAM -----xx-- option ROM bank $9000-$AFFF 00: bank 0 01: bank 1 10: bank 2 11: bank 3 -------xx main ROM bank $B000-$E7FF, $F000-$FFFF 00: bank 0 (BASIC 1.0rev) 01: bank 1 (BASIC 1.0) 10: bank 2 (BASIC 2.0) 11: bank 3 (BASIC 4.0) PET 2001N and later (with option ROM sockets). Only available on special request! DIP switch 123456789 x-------- 1: Enable Flashmode -x------- 1: Enable ROM --x------ 1: Enable RAM ---x----- 0: 16kB RAM 1: 32kB RAM ----x---- 1: enable option ROM bank (only possible if ROM is on) -----xx-- option ROM bank $9000-$AFFF 00: bank 0 01: bank 1 10: bank 2 11: bank 3 -------xx main ROM bank $B000-$E7FF, $F000-$FFFF 00: bank 0 (BASIC 1.0rev) 01: bank 1 (BASIC 1.0) 10: bank 2 (BASIC 2.0) 11: bank 3 (BASIC 4.0) VIC DIP switch 123456789 x-------- 1: Enable Flashmode -x------- 1: Enable main ROM --x------ 1: Enable option ROM ---xx---- 00: 0kB RAM 01: 8kB RAM (3k expansion) 10: 16kB RAM (3k + 8k) 11: 32kB RAM (3k +24k) -----xx-- option ROM bank $A000-$BFFF 00: bank 0 01: bank 1 10: bank 2 11: bank 3 -------xx main ROM bank $C000-$FFFF 00: bank 0 01: bank 1 10: bank 2 11: bank 3 FDD (2031/1540/1541/1570/1571/1571CR) DIP switch 123456789 x-------- 1: Enable Flashmode -x------- 1: Enable ROM --xx----- RAM/ROM configuration 00: 0kB RAM, ROM $8000-$FFFF (1541/1571 compatibility) 01: 10kB RAM $0000-$07FF, $6000-$7FFF, ROM $8000-$FFFF (1541/1571 RAM-Board, diagnostic, DolphinDOS-6000) 10: 8kB RAM $8000-$9FFF, ROM $A000-$FFFF (1541 DolphinDOS 2.0 original version) 11: 32kB RAM $2000-$9FFF, ROM $A000-$FFFF (1541 max RAM) ----x---- RESERVED, MUST BE IN OFF POSITION!!! -----xx-- option ROM bank, only used for Flashmode 00: bank 0 01: bank 1 10: bank 2 11: bank 3 -------xx main ROM bank 00: bank 0 01: bank 1 10: bank 2 11: bank 3