🚀 go-pugleaf

I couldn't find the 8 pin Din males anywhere, so I decided to use the
adapter cable that came with the Mac + and got myself some DB9 males
and made up these two cables:

For connecting Mac to Modem or other DCE-type Female:

  DB9 Male                              DB25 MALE

       GROUND 3 O------+----------------O 7  GROUND
  XMIT DATA + 4 O-x    )
  XMIT DATA - 5 O------)----------------O 2  XMIT DATA
HANDSHAKE OUT 6 O---+--)----------------O 20 DATA TERMINAL READY
HANDSHAKE  IN 7 O---+  |            +---O 4  REQUEST TO SEND
  RECV DATA + 8 O------+            +---O 5  CLEAR TO SEND
  RECV DATA - 9 O-----------------------O 3  RECV DATA

This works with our three-wire Gandalf network inhouse and with a Courier
modem at home.  The Mac is the new RS-422 (?) balanced protocol, and the
old RS-232 had inverted data, so the DATA - goes across and the DATA +
gets grounded to complete the circuit.  Do NOT ground XMIT + !

For connecting Mac to Terminal or other DTE-type Male:

  DB9 Male                              DB25 FEMALE

       GROUND 3 O------+----------------O 7  GROUND
  XMIT DATA + 4 O-x    |
  XMIT DATA - 5 O------)----------------O 3  RECV DATA
HANDSHAKE OUT 6 O-x    |
HANDSHAKE  IN 7 O------)----------------O 20 DTR
  RECV DATA + 8 O------+
  RECV DATA - 9 O-----------------------O 2  XMIT DATA

This works with an H19 at home and a Volker Craig 4404 at work.  If your
device is persnickety it might want Carrier Detect on pin 8, if so the
connect 8 to 20 at the DB25 end (so DTR drives it).  One might also have
to connect pins 4 and 5 (RTS-CTS) together at the DB25 end to make some
devices happy.

Other than that, get a breakout box and read the specs, and if it does
not work then don't leave it connected long enough to get hot...
-- 
                    umd5.UUCP    <= {seismo!umcp-cs,ihnp4!rlgvax}!cvl!umd5!zben
Ben Cranston zben @ umd2.UMD.EDU    Kingdom of Merryland Sperrows 1100/92
                    umd2.BITNET     "via HASP with RSCS"