The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- CAPCOM CPS2 (12 members)
- CAPCOM CPS Changer (1 member)
- CAPCOM C Boards (1 member)
- CAPCOM PLD's (119 members)
- Cave (9 members)
- Comad (2 members)
- Commodore (2 members)
- Computer (86 members)
- Console (14 members)
- Cracked (1 member)
- Creative Electronics & Software (1 member)
- Data East (60 members)
- Data East Hardware ID (23 members)
- Data East PLD's (94 members)
- Data I/O (4 members)
- Datasheet (2 members)
- Diagnostic ROM (1 member)
- Dooyong (3 members)
- Dynax (1 member)
- EEtools (1 member)
- EPOS (1 member)
- Ecogames (1 member)
- Epos (1 member)
- Equipment (2 members)
- F2 System (3 members)
- Fluke (8 members)
- Fruit Machine (4 members)
- Gaelco (8 members)
- Hi-Lo Systems (4 members)
- IGS (5 members)
- Incredible Technologies (5 members)
- Irem (52 members)
- Irem M107 (3 members)
- Irem M119 (1 member)
- Irem M62 (2 members)
- Irem M72 (12 members)
- Irem M75 (1 member)
- Irem M81 (3 members)
- Irem M82 (4 members)
- Irem M84 (5 members)
- Irem M85 (1 member)
- Irem M90 (2 members)
- Irem M92 (14 members)
- Irem M97 (2 members)
- Irem M99 (1 member)
- Irem PLD's (39 members)
- Jaleco (6 members)
- Kaneko (13 members)
- Kaneko PLD's (2 members)
- Konami (90 members)