Schematic

This is an alternate version of the Pokey cart that has a bankswitchd ROM. As in a normal Pokey cart the Pokey is mapped to address range $4000-$7FFF. The cart supports up to 8 or 32, 16K banks of ROM depending on the size of the ROM at U1. The banks are mapped to address range $8000-$BFFF. The address range $C000-$FFFF is fixed and will be mapped to either bank 7 or bank 32 depending on the size ROM that is used. The U1 can accomodate either a 28 pin or 32 pin ROM. The jumpers are set as follows:

28 Pin ROM: W1: Open W2: 2-3 W3: Open W4: Open R7: Not populated R6: 0 Ohm resistor

32 Pin ROM: W1: 2-3 W2: 1-2 W3: Closed W4: Closed R7: 3.3K R6: 3.3K

Games used in:
Commando
  (28 pin 231000 ROM) - W1:open, W2:2-3, W3:open W4:open, R6:0 ohm, R7:not populated
  (32 pin ROM) - W1:2-3 W2:1-2, W3:close W4:close R6:3.3K, R7:populated