Hersteller
- Columbia (2)
- Comrex (1)
- Canon (4011)
- C-ZAM (2)
- C.Itoh (102)
- Cado System Corporation (9)
- Calcomp (9)
- Capital Circuits (9)
- Capro (1)
- Casca (2)
- Cash Register (1)
- Casio (329)
- CBM (2)
- CDK (4)
- Centronics (5)
- Cgct (1)
- Chelgraph (1)
- Chinon (3)
- Cikam (2)
- Citizen (247)
- CMC (2)
- Codec (4)
- Colex (7)
- COM-Star (2)
- Commodore (CBM) (33)
- Compaq (18)
- Comparex (1)
- Compterno (1)
- Compuadd (1)
- Compucorp (1)
- Compugraphic (2)
- Compuprint (135)
- Computer Language (5)
- Computers International (2)
- Comtech (2)
- Comterm (2)
- Comtex (1)
- Concord (3)
- Cono (1)
- Consul (1)
- Control Data Corporation (3)
- Convergent (3)
- Copal (4)
- Copy-MAT (1)
- Copystar (56)
- COT (16)
- Courier (3)
- CPF (10)
- CPT (10)
- Crossroads Tech INC. (1)
- CRS (10)
- CTI (1)
- CTM (13)
- Cytec (2)
