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35815RE: [midatlanticretro] PDP-11/23 console port

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  • Cory Smelosky
    May 5, 2014
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      On Tue, 6 May 2014, Malcolm Macleod wrote:

      >> Cory Smelosky
      >
      > Cory - I'm using the M8043 Print Set (MP00586) as a guide. It's on
      > Bitsavers as part of the PDP11/23 Field Maintenance Print Set (MP00740).
      >
      > Here's a copy of MP00586 that I extracted from MP00740 ->
      > http://www.avitech.com.au/pdp-11-03/manuals/M8043_Print_Set_MP00586.pdf
      >

      Thanks.

      > Page 11 of that PDF shows the pin numbering (when viewing the 10-pin box
      > header from the mating side).
      >
      > Page 10 of the PDF shows the RS232 I/O connections.
      >
      > Pin 7 (RCV DATA -) needs to be tied to Pin 9 (GND) at the 11/23 end of the
      > cable.
      >
      > Once that is done, connect:
      >
      > 11/23 pin 3 (XMT DATA +) to DE9 pin 2 (RXD)
      > 11/23 pin 5 (GND) to DE9 pin 5 (GND)
      > 11/23 pin 8 (RCV DATA +) to DE9 pin 5 (TXD)
      >

      Sure you mean 8 to 5? That's GND. Receiving could prove useful. ;)

      > I also do loopbacks at the DE9 as follows:
      > Pin 4 (DTR) to Pin 6 (DSR)
      > Pin 7 (RTS) to Pin 8 (CTS)
      >
      > This setup works fine between my USB-to-RS232 adapter and my 11/23 (M8189 or
      > M8043).
      >
      > Perhaps also check that your terminal program (PC end) isn't waiting for
      > hardware handshaking (CTS/DSR).
      >

      Doubtful, but it's possible.

      > Apart from that it *should* work.
      >

      I had it working at one point...then I didn't. I don't THINK I blew out a
      driver...I'd smell THAT.

      > Hope this helps.
      >
      > Malcolm.
      >
      >
      >
      >
      > ------------------------------------
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      --
      Cory Smelosky
      http://gewt.net Personal stuff
      http://gimme-sympathy.org Projects
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