dudegladstone wrote:
...where all the switch points are connected to a DIP switch or a single throw quad pole if such a thing exists.
That likely isn't necessary.
..........................................................................
+5---o__o------+-----PRG ROM 1---------+............
.....|..DIP..........|....................................|---+.......
.....|.................+----CHR ROM 1----------+....|.......
.....|............................................................|.......
.....+-o__o-----+-----PRG ROM 2---------+....|.......
.....|..DIP..........|....................................|---GND...
.....|.................+----CHR ROM 2----------+....|.......
.....|............................................................|.......
.....+-o__o-----+-----PRG ROM 3---------+....|.......
........DIP..........|....................................|---+.......
.......................+----CHR ROM 3----------+.............