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30 0V — Signal Ground
(nAutoFd, nSelectln,
nInit)
31 Input Prime to printer nInit
32 Fault from printer nFault
33 0V — —
34 [NOT USED] — —
35 — from printer Pulled up to +5V
through 3.3 Kohm
36 Sel In to printer nSelectIn
Parallel Interface Pin Assignments: ECP Mode
Pin Signal Name Direction ECP
1 Data Strobe to printer HostClk
2-9 Data Bit n to printer Data 1 (LSB) to 8
(MSB)
10 Acknowledge from printer PeriphClk
11 Busy from printer PeriphAck
12 Paper End from printer nAckReverse
13 Select from printer Xflag
14 Auto Feed to printer HostAck
15 [not used] — —
16 0V — Logic Ground
17 Chassis Ground — Chassis Ground
18 +5V from printer Peripheral Logic High
19 0V — Chassis Ground
20-27 0V — Signal Ground
(nStrobe)
28 0V — Signal Ground (Data 1-
8)
29 0V — Signal Ground (Perror,
Select, nAck)
30 0V — Signal Ground
(nAutoFd, nSelectIn,
nInit)
31 Input Prime to printer nReverseRequest
32 Fault from printer nPeriphRequest
33 0V — —
435