|Re: Characteristics:HP 9871A printer|
Message #2 Posted by Ellis Easley on 27 July 2003, 9:55 a.m.,
in response to message #1 by Jack T.Lee
The 98032A Option X71 parallel interface is used to connect the 9871A printer to a 9825, 9835, or 9845 calculator/computer. it might be possible to connect the 9871A to other calculators but the 9825 is the only model I am familiar with.
From the 98032A manual, pages 60-61, "9871A printer Interface":
(This manual is on/in CD6 in the latest Museum CD/DVD-ROMs. I can't look at mine now, my DVD drive is broken! but I have a printed manual)
printer 37 pin connector pin:printer signal name (98032A Interface Connector pin:98032A signal name) [wire color code]
12:CALC7 (A10:DO7*) , 13:CALC6 (A11:DO6*) , 14:CALC5 (A12:DO5*) , 32:CALC4 (A13:DO4*) , 31:CALC3 (A14:DO3*) , 30:CALC2 (A15:DO2*) , 29:CALC1 (A16:D01*) , 28:CALC0 (A17:DO0*) , 26:GND (A18:GND) , 9:CMD (A19:PCTL*) , 10:HLT (A21:Preset*) , 33:GND (A24:GND) , 27:GND (B18:GND) [Inner Shield], 11:FLG (B19:PFLG*) , 5:COVER ON (B20:PSTS*) , 8:BUFR RDY (B22:STI0*) , 7:READY (B23:STI1*) , 34:GND (B24:GND) 
Also, at the 98032A Interface Connector, pin A25 (Chassis) is connected to the Cable Shield. And the 98032A Configuration Board must have wire jumpers installed at positions 4 and 5. (This configuration board wiring and cable make a 98032A into "Option X71".)
The wire color codes are the same as resistor color codes: 0:black, 1:brown, 2:red, 3:orange, 4:yellow, 5:green, 6:blue, 7:violet, 8:gray, 9:white. When there is more than one color listed for a wire, the first color is the insulation color, the second is the wider stripe, the third is another, narrower stripe.