User`s manual

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(1) Outline
The familiar Centronics interface is used in the Compatibility mode.
(2) Specifications
Data transfer : 8-bit parallel
Synchronization : External nStrobe signal
Handshaking : nAck and Busy signals
Signal level : All signals TTL compatible
Connector : 57LE-40360 or equivalent (IEEE, 1284 Type B)
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Status data may be transferred from the printer to the host in either the Nibble or Byte
mode.
Outline:
It is assumed that data is transferred from an asynchronous printer controlled from the host.
The existing control lines are used in transferring data in the Nibble mode (transferred in 4-
bit units (nibbles)). Data is transferred in both directions on 8 data lines in the Byte mode
(8-bit units (bytes)).
As simultaneous execution with the Compatibility mode is not possible, half-duplex
communication is employed. See Appendix 2 for details.