[Info-vax] C limitations, was: Re: VMS process communication

[John Dallman]

In article <k8jc4aFmhtrU2 at mid.individual.net>, bill.gunshannon at gmail.com
(bill) wrote:

> Weird?  What about under Primos where chars always have the high 
> order bit turned on?  It was called "mark memory parity" but it 
> never made any sense to me when I had to work with it.  :-)

You've explained a mystery from 40 years ago. My undergraduate project
was doing animation on a strange colour graphics vector terminal
connected to a Prime 750 running PrimeOS. There were several weeks of
delays while it was got working with PrimeOS, and I never found out why.
It was driven over a serial line and its command language encoded
coordinates in the binary values of ASCII characters. Suddenly, the
problem is obvious. 

John