Oki OKIPAGE 14EX Service Manual page 237

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Connector pin arrangement
(4) Signal Level
LOW : 0 V to + 0.8 V
HIGH : + 2.4 to 5.0 V
5) Specifications
Item
Mode
Data bit length
Input prime
Receive buffer,
Control
6) Timing Charts
Description
Compatibility mode, Nibble mode, ECP mode
8 bits (in the compatibility mode)
Valid/Invalid
8K, 20K, 50K, 100K, 1M Bytes
Handshaking control is performed in each mode.
Data received from the host is stored in the receive buffer.
Busy control is performed.
Signal lead control is performed.