At 19:26 +0200 9/8/05, Joost van de Griek wrote:
>To connect two Macs directly to each other through their serial ports,
>similar to connecting two PC's through a null-modem cable, take a Mac
>printer cable and connect them: done.

Correct. The "printer" cable does the inversions so that transmitters talk to 
receivers. It is not wired as pin to pin.

The two Macs can actually talk with terminal software at each end or as a 
LocatTalk / AppleShare connection. What's a shame is that one cannot connect to 
an OS neXt machine and telnet to it with a printer cable.

Printer Mac
1  Hsk out      2  Hsk in       Handshake to Mac
2  Hsk in       1  Hsk out      Handshake from Mac
3  TxD- 5  RxD- Data to Mac
4  GND  4  GND  Logic ground
5  RxD- 3  TxD- Data from Mac
6  TxD+ 8  RxD+ Data to Mac
8  RxD+ 6  TxD+ Data from Mac
  Varies        7  GFI  Carrier detect if Mac is a server
shell   shell   Overall shield

To make what I call a null modem which would be used for testing so that 
whatever is sent out comes back in on the same connector, do this:  On a single 
connector connect 3-5, 2-1, 6-8. Leave 4 and shell unconnected. Do what you 
need with 7 which is sometimes used for high speed modems and other times for a 
remote clock.

-- 
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would make man ask what existed before the Creation. So He installed a few 
gigayears of history complete with a big bang and a fossilized record of 
evolution. <--

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