Date: August 2, 1986 18:49 EDT
From: B.DUERR (William O. Duerr, GEnie CP/M RT SysOp)
Sub: MEX114 backspace patch
GEnie does not seem to backspace properly when the character
delete character is defined as a <DELETE> or decimal 127. It does
work well when defined as a Control-H or decimal 8.
Mex has a way of converting the back the back space (Control-H)
to a <DEL> character but not the visa versa. This patch to MEX will
change the <DEL> to a Control-H when the STAT parameter is on.
First of all varify that you have the same code as I do. I have
MEX 1.14. You will need DDT, or similar program. The C-128 comes
with SID, for what we are going to do, I think the program is
similar enough.
Enter at the A> prompt: DDT mex.com
Then at the "-" prompt: L4051
at location 4051 you should see a CPI 08 instruction,
at location 405D you should see a MVI 7F instruction.
To get out of DDT, enter Control-C.
Now get in to MEX as you normally do.
On the MEX command line, enter
POKE $4052 $7F
POKE $405E $08
STAT RUB ON
You can now test the program. When you know it works you can
CLONE it (make a copy of MEX with the modifications in it.)
Don't forget to take the normal precautions when making
modifications. Take a backup.
