In the schematics, the pins are numbered A1..A18 and B1..B18. However, the text layer on the cartridge PCBs typically uses a different numbering: 1..36 (with even numbers on the solder side of the cartridge) (and with numbers ordered in opposite direction):
component side solder side Cartridge Slot, female 2x18pin
1 B18 VCC 2 A18 VCC ________________________
3 B17 CLK4 4 A17 CA18/LK2 (B18) 1 | | 35 (B1)
5 B16 CA16 6 A16 CA17/LK4 |_ ------------------ ================== _|
7 B15 CA15/LK6 8 A15 CA14 (A18) 2 |____________________| 36 (A1)
9 B14 A12 10 A14 A13
* Note: Arnold V specs say that "ROM CARTRIDGE: 2 pcs 2 x 9 way 2.5mm pitch sockets." This seems to be nonsense (or might refer to an internal connector on the mainboard). The external cartridge connector has 2x18 pins - not 2x2x9 pins.
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