Tektronix Phaser 540 Plus User Manual page 162

A
Technical Notes
A-12
Phaser 540 Color Printer
Parallel port signal descriptions (cont'd.)
Pin Signal mode names:
Compatibility/Nibble
11 Data 6
12 Data 7
13 Data 8
14 nInit/nHostRTS
15 nStrobe/HostClk
16
nSelectIn/1284 Active
17
nAutoFd/HostBusy
18 Host Logic High
36 Peripheral Logic High
Return Signal Description
pin source
29 Host C mode:
N mode:
30 Host C mode:
N mode:
31 Host C mode:
N mode:
32 Host C mode:
N mode:
33 Host C mode:
N mode:
34 Host C mode:
N mode:
35 Host C mode:
N mode:
Host Positive true = host signals valid
Negative true = host signals invalid
Printer Positive true = printer on
Negative true = printer off
Positive true data input
Not used
Positive true data input
Not used
Positive true data input
Not used
Negative true = reset
interface
Not used
Negative true = transfer
data into printer input
latch on rising edge
Negative true = transfer
Extensibility Request
value into printer input
latch on rising edge
Negative true = select
printer
Used in conjunction with
HostBusy for 1284
hardware handshaking
Not used
Used in conjunction with
1284 Active for 1284
hardware handshaking