[Info-vax] Calling $CREPRC in COBOL

[Simon Clubley]

On 2022-06-13, Dennis Boone <drb at ihatespam.msu.edu> wrote:
> > Using COBOL to interface to VMS has been a serious eye-opener for me in
> > reading this thread.  I guess no-one is going to be doing even a bare
> > metal LED blinker in COBOL any time soon...  :-)
>
> Never underestimate the chance that some weirdo may combine some COMP
> data, the REVERSE verb, and some overlay moves.  I mean, there's
> http://www.coboloncogs.org/ so...
>
> /me ponders how to nmost obscurely get GPIO on a vax or itanic.
>

Most obscure would probably be using the control signals on a _real_
serial port, not USB serial port, as GPIO pins.

Abusing a parallel port would also do it, but that's not as obscure
as using the control signals on a serial port.

There are designs for building low-cost microcontroller programmers
that work with control signals on real serial ports on PCs running
Linux. Just be aware of potential voltage compatibility issues with
current microcontrollers before trying the designs however.

Simon.

-- 
Simon Clubley, clubley at remove_me.eisner.decus.org-Earth.UFP
Walking destinations on a map are further away than they appear.