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echo: amiga
to: Jeff Bowman
from: Andy Ball
date: 2008-03-10 19:52:02
subject: Amiga serial ports

Hello,

Here's a wiring arrangement          Amiga             PC
that should work for SLIP or         ~~~~~~            ~~~~~
PPP between Amiga 25 pin and         FG   1
PC 9 pin serial ports.  It is
an ordinary DTE-to-DTE "null         TXD  2 ----\/---- 3 TXD
modem" cable that would also         RXD  3  2 RXD
let you log into the PC from
the Amiga if you were running        RTS  4 ----\/---- 7 RTS
unix on the PC, or let you           CTS  5  8 CTS
log into the Amiga if it's
running BBS software that            DTR 20 ----\/---- 4 DTR
supports a direct connection.        DSR  6  6 DSR
I've a vague recollection            DCD  8  1 DCD
that the Amiga could be
persuaded to dump information from its serial port in the event of a crash
and I wouldn't be surprised if AmigaDOS could redirect its console to/from
the serial port.

Power supply pins (stay away from these) follow.  These pin- outs are
straight from the web, so check for yourself before using them, or any pins
other than the eight shown above. Use good screened/shielded untwisted
cable and connect the screen to pin one (frame ground) at the Amiga end
only.

A1000                        Other Amigas

  14 -5V  50mA max             9 +12V 20mA max
  21 +5V                      10 -12V 20mA max
  23 +12V 20mA max

Hope this helps,
  - Andy Ball.

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