Gestetner A193 Service Manual page 794

2.2 INTERFACE
2.2.1 Host Interface
Bi-Directional Parallel Interface
18
36
A 36 pin D-SUB Centronics connector (female).
The bi-directional parallel interface on the controller works in the 3 modes;
compatible, nibble, and ECP modes (these modes are standardized by IEEE
1284).
SIGNAL
PIN
STD (I/O)
1 /STROBE (I)
2-9 DATA1-8 (I)
10 /ACK (O)
11 BUSY (O)
12 PE (O)
13 SELECT (0)
14 /AUTOFEED (I)
15 NC
16 GND
17 CHASSIS GND
18 NC
19-30 GND
31 /INIT (I)
32 /ERROR (O)
33 GND
34 NC
35 +5V
36 /SELECTIN (I)
SM
1
19
A643D502.wmf
SIGNAL NAME
NIBBLE (I/O)
/STROBE (I)
NOT USED
PtrClk (O)
PtrBusy (O)
AckDataReq (O)
Xflag (O)
HostBusy (I)
<--
<--
<--
<--
<--
/INIT (I)
DataAvail (O)
<--
<--
<--
1284Active (I)
1-5
ECP (I/O)
HostClk (I)
DATA1-8 (I/O)
PeriphClk (O)
PeriphAck (O)
/AckReverse (O)
Xflag (O)
HostAcK (I)
<--
<--
<--
<--
<--
/ReverseRequest (I)
/PeriphRequest (O)
<--
<--
<--
1284Active (I)
(A643)