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Signals
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Signals
Table 4 lists each of the signals associated with the corresponding pins
on the 1284 interface. Descriptions of the signals follow.
Table 4. 1284 Signals
Pin Source of Data
Type of Mode
Compatible Nibble Byte
1 Host nStrobe HostClk Host/Clk
2 Host/Printer Data 1 (LSB)
3 Host/Printer Data 2
4 Host/Printer Data 3
5 Host/Printer Data 4
6 Host/Printer Data 5
7 Host/Printer Data 6
8 Host/Printer Data 7
9 Host/Printer Data 8 (MSB)
10 Printer nAck PtrClk PtrClk
11 Printer Busy PtrBusy PtrBusy
12 Printer PError AckDataReq AckDataReq
13 Printer Select Xflag Xflag
14 Host nAutoFd Host Busy HostAck
15 Not Defined
16 Logic Grid
17 Chassis Grid
18 Printer Peripheral Logic High