Tektronix 220e User Manual
Page 104
A
Technical Notes
A-2
Phaser 220i and Phaser 220e Color Printers
Parallel port signal descriptions
Signal name
Pin #
Return
pin
Signal
source
Description
DSTRB-
1
19
Host
Pulsed low for .5
microseconds; clocks data
into printer
DATA1
2
20
Host
Positive true data input
DATA2
3
21
Host
Positive true data input
DATA3
4
22
Host
Positive true data input
DATA4
5
23
Host
Positive true data input
DATA5
6
24
Host
Positive true data input
DATA6
7
25
Host
Positive true data input
DATA7
8
26
Host
Positive true data input
DATA8
9
27
Host
Positive true data input
ACK-
10
28
Printer
Data acknowledge pulsed low
for 3-4 microseconds; ends
bus transaction
BUSY
11
29
Printer
Positive true = cannot accept
data
PE
12
-
Printer
Positive true = out of paper or
transfer roll
SLCT
13
-
Printer
Positive true = printer selected
INPRIME-
31
30
Host
Negative true = printer port
reset
FAULT-
32
-
Printer
Negative true = printer fault
indicator
Frame Gnd
-
17
Printer
Frame ground
SGnd
-
14,16,33
Printer
Signal ground