Appendix
69
Interface signals
Pin
Source
Compatibility
Mode
Nibble Mode
Byte Mode
1
Host
Strobe
HostClk
HostClk
2
Host/Ptr
Data0 (LSB)
Data0 (LSB)
Data0 (LSB)
3
Host/Ptr
Data1
Data1
Data1
4
Host/Ptr
Data2
Data2
Data2
5
Host/Ptr
Data3
Data3
Data3
6
Host/Ptr
Data4
Data4
Data4
7
Host/Ptr
Data5
Data5
Data5
8
Host/Ptr
Data6
Data6
Data6
9
Host/Ptr
Data7 (MSB)
Data7 (MSB)
Data7 (MSB)
10
Printer
Ack
PtrClk
PtrClk
11
Printer
Busy
PtrBusy/Data3,7
PtrBusy
12
Printer
Perror
AckDataReq/Data2,6
AckDataReq
13
Printer
Select
Xflag/Data1,5
Xflag
14
Host
AutoFd
HostBusy k
HostBusy
15
NC
ND
ND
16
GND
GND
GND
17
FG
FG
FG
18
Printer
Logic-H
Logic-H
Logic-H
19
GND
GND
GND
20
GND
GND
GND
21
GND
GND
GND
22
GND
GND
GND
23
GND
GND
GND
24
GND
GND
GND
25
GND
GND
GND
26
GND
GND
GND
27
GND
GND
GND