Epson GT-6500 EN - Manual (Page 166)

Parallel Interface Specifications
Interface type: Bi-directional parallel interface
Data format: 8-bit parallel
Synchronization: By external strobe pulse
Handshaking: By ACKNLG and BUSY signals
Logic level: Input/output data and interface
control signals are TTL level
compatible.
Connector type: 36-pin Centronics type connector
Connector pin arrangement:
pi_f
A-4 Interface Specifications