Compuprint 4051 - Manual (Page 124)

Printer Specifications
118
Physical and Electrical Characteristics
Interfaces
Parallel I/F IBM-Epson and Centronics compatible
Bidirectional, IEEE 1284
Buffer: up to 32 KBytes
Nibbles and Byte Mode
Shared w/ DLL buffer
7/8 data bits max 100 KBPS
Serial I/F RS-232/C and 422/A
600 to 38400 baud bps
7/8 data bits
DTR
XON/XOFF
Break
Buffer : up to 32 KBytes
Shared w/ DLL buffer
Automatic Interface Switching