Re: Testing a serial port

[jim@magrathea.plus.com (Jim)]

Jim <jim@magrathea.plus.com> wrote:

> However, resetting the //e then type IN#2 and typing on the PC keyboard
> (still in Hyperterm) resulted in...nothing.

And the reason for that was: there was a wee custom hardware doohicky
between the serial card and the outside serial port. It's swapping the
send line in much the same way as a null-modem cable would (pin 3 inside
went to pin 2 outside), plus a little bit of circuitry that is, I guess,
performing some automated character translation. Or something.

Interestingly pin 2 inside was wired to...nothing. So this serial port
mod means it can send but not receive.

Bypassing the mod and kludging some...interesting...cables/connectors
together means it can now send *and* receive.

Time for a coffee.

Jim
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