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B–14
Host I/O Interfaces
Xflag. Driven by the printer. A high true level indicating the printer is ready for
data transfer and the printer is on-line. (Data bits 2 and 6 in Nibble Mode.)
Host Busy / Host Acknowledge / NDStrobe. Driven by the host. Activates
auto–line feed mode.
Peripheral Logic High. Driven by the printer. When the line is high, the printer
indicates all of its signals are in a valid state. When the line is low, the printer
indicates its power is off or its signals are in an invalid state.
nReverse Request. Driven by the host. Resets the interface and forces a return
to Compatibility Mode idle phase.
nData Available/ nPeripheral Request. Driven by the printer. Indicates the
printer has encountered an error. (Data 1 and 5 in Nibble Mode.)
1284 Active nAStrobe. Driven by the host. A peripheral device is selected.
Host Logic High. Driven by the host. When set to high, the host indicates all of
its signals are in a valid state. When set to low, the host indicates its power is off
or all of its signals are in an invaild state.
nINit. Resets init interface from the host.