ees@vax135.UUCP (Gene Sampieri) (11/30/84)
How do I Access the PIO port from an assembly language program not using DSRLINK. Want to use a PAB of my own to allow me to load and link from X-BASIC. RS232/1 is CRU >1300 and /2 is CRU >1380. I cannot find anything that relates to the PIO in my papers. Gene Sampieri ATT-BL vax135!ees
kermit@okstate.UUCP (12/09/84)
[munch...munch...munch...]
Make it easy on yourself and use DSRLNK. If you must use direct port
addressing than you will have to experiment to find the right 8 bits to
write to. Try turning your printer or whatever paralel device you are using
and load the TI-BUG (or you favorite monitor that gives access to the the
CRU bits), and write to consecutive bytes until you get a reaction from
the device. Although this is primative at best, it will probably solve
your problem. By the way, if you have not heard of The BUGOUT Machine
Language Monitor which I wrote for the 99/4A, you should look into getting one.
It gives you window editing features (By the bit in the case of CRU memory)
that would allow you to watch the status of the RS232 card as you tested the
device.
Gregg Wonderly <kermit@okstate>