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