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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