PARALLEL PORT PIN SIGNALS
512
15 nStrobe/HostClk 33 Host ■C mode: Negative true = transfer data into
printer input latch on rising edge
■N mode: Negative true = transfer
Extensibility Request value into printer input
latch on rising edge
16 nSelectIn/1284 Active 34 Host ■C mode: Negative true = select printer
■N mode: Used in conjunction with
HostBusy for 1284 hardware handshaking
17 nAutoFd/HostBusy 35 Host ■C mode: Not used
■N mode: Used in conjunction with 1284
Active for 1284 hardware handshaking
18 Host Logic High Host ■Positive true = host signals valid
■Negative true = host signals invalid
36 Peripheral Logic High Printer ■Positive true = printer on
■Negative true = printer off
Parallel port signals (cont'd.)
Pin Signal mode names:
Compatibility/Nibble Return
pin Signal
source Description