Tektronix Phaser 600 User Manual
Page 528
P
A R A L L E L
P O R T
P I N
S I G N A L S
5 1 2
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