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