[plug] Macs and Linux (OLD macs)

[Harry McNally]

On Fri, 26 Jul 2002 16:15:30 +0800 Brad Campbell <brad at seme.com.au> wrote:

> I am the LinuxAlien wrote:
> > 
> > >
> > >Hell, I had it running on a IIsi with 4 meg of ram.. bit slow in X though
> > >:p) Even bodged up a serial null modem cable to my laptop to give it a
> > >network, though ppp at 19,200 baud is a bit painful.

Could this be tweeked to a faster baud ?

> > how did you get the serial cable connected, what port?
> > Tim
> Printer or modem port.. Just used some nice fine wire and poked it in there.
> Pinouts are available on the net. The mac uses a varian of rs-422, so you
> connect the Data + line to ground and connect the Data - line to the Rs-232
> pin for both tx and rx.

Oooo. That makes the engineering brain cells cringe. Methinks you may be hurting
the RS422 driver that way. Actually no. If the parts have overcurrent protection
it probably hangs in there. Still not nice if the equipment shares a common
ground because RS232 won't get tidy negative-going swings.

Tim, I could draw you a little circuit and you could wirewrap a converter for
RS422 to RS232 (if there isn't something on the web anyway). It's a two chip
solution. That way your drivers at both ends will be happy. Stick it in a little
plastic box and robert's yer dad's bro. Hmmm. Needs power. Plug pack. Linear
regulator. Decoupling caps. Uh-o. Did I say two chip solution ? Let me know how
keen you are on a scale of 1 to 11.   

> No handshaking.

Likewise.

Harry

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