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pport.doc
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1990-03-08
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978b
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25 lines
The printer ports on the IBM DB25 connector are as follows
LPT1 LPT2 Pin Signal Bit#
632d 888d 2-9 Data 0-7 0-7
633d 889d 15 Error (input) 3
633d 889d 13 Select (input) 4
633d 889d 12 Paper End (input) 5
633d 889d 10 Acknowledge (input) 6
633d 889d 11 Busy (input) 7
634d 890d 1 Strobe 0
634d 890d 14 AutoFeed (out) 1
634d 890d 16 Initialize (out) 2
634d 890d 17 Select In (out) 3
The author has successfully interfaced the MFJ-1224 RTTY/CW interface to the
printer port as follows:
Port 890d bit 3 set up for key line output
Port 889d bit 7 set up for receiver input