HP Forum Archive 16

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Anyone have the PINOUT of the Front Ports on the 71B? Message #1 Posted by Mike on 21 Aug 2006, 2:07 p.m. I have the signals (I think). From reading the Hardware IDS, I believe the following are the signals: BUS[0:3], *STR, *CD, Vdd, Gnd, Din, Dout, *INT, *IR14, Halt (except for port 1). I could be wrong on these, but there are 13 pins and this is my guess on the 13 signals. Anyone feel free to correct me, if I'm wrong. However, I can't find any description on which pin is which. I can figure this out, in time, but I was wondering if anyone knows the pin numbering on the HP-71B Front Ports? Thanks, Mike Edited: 21 Aug 2006, 2:08 p.m.

Photo of connector Message #2 Posted by Mike on 21 Aug 2006, 8:52 p.m., in response to message #1 by Mike There are 13 contact positions on a module. Of these 13 possible contacts, 11 are common. So, I presume the two that are not common are the Din and Dout (but I could be wrong). Further, it's easy to spot Vdd and Gnd. And the "module pulled" contact seems obvious. However that still leaves 8 to figure out. Here are two photos. Port 3 is interesting, in that it has a pad, recessed further in, that can't be reached by a module. Anyone know what this is for? Edited: 22 Aug 2006, 1:22 a.m.

Re: Photo of connector Message #3 Posted by Klaus on 23 Aug 2006, 9:52 a.m., in response to message #2 by Mike This puzzle is easy: Pin 1: GND Pin 2: *Int (module pulled) Pin 3: OD /HALT (depends on port) Pin 4: IR14 (I/O handshake and wakeup) Pin 5: Daisy out (only for Prot Extender) Pin 6: Daisy in Pin 7: *C/D Data/Command signal Pin 8: Strobe Pin 9: B0 (I/O 0) Pin10: B1 (I/O 1) Pin11: B2 (I/O 2) Pin12: B3 (I/O 3) Pin13:Vdd (6V) (Sorry, I can't get the line-breaks right) I have this Pins printed out on a paper that says 'CHHU V1N1'. I don't know if it is on the Museum's DVD, or on TOS!

Re: Photo of connector Message #4 Posted by Mike on 23 Aug 2006, 4:00 p.m., in response to message #3 by Klaus Thanks this helps a lot. I had already determined which was *CD, *STR, Bus[0:3], Vdd, Gnd and Module Pulled (but not INT) but the rest were a mystery. I was also originally wrong on the Din/Dout. I have one of those LogicPort Analyzers and it made it fairly easy to spot *STR, *CD and Bus[0:3] Thanks, Edited: 23 Aug 2006, 4:11 p.m.

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