6 Jul
2012
6 Jul
'12
7:09 p.m.
The Real Time Interface (RTI) is interesting. It has 2
RS-232 serial ports,
1 IEEE-488 port, and 24 bi-directional TTL level I/O pins. These all exit
the machine on a 62-pin D shell connector. This was typically used as the
interface to the VAX when the Pro was used as a VAX console.
I wondered if it was that board. I have one in one of my Pros
IIRC the 24 TTL I/O lines are driven by an 8255, so yuo can only set the
directions in blocks (You can set the driections of port A, port B, and
each half of portC in the simplest case). And changing the direction will
set all outputs to 0. Not my favourite device..
Is there any techncial infromation o nthis board anywhere? Software to
drive it?
-tony