🚀 go-pugleaf

/ hpopd:comp.os.msdos.programmer / halvers@procyon.crd.ge.com (peter c halverson) /  6:55 pm  Apr  9, 1992 /

>I'm trying to use Borland's "ctrlbrk" function to handle ^C/^Break events
>(setting a flag that another routine eventually notices), and it seems to
>work as advertised, except that I can't seem to suppress the echo of
>"^C<CR>" to the screen (which trashes the display).  Obviously there's some
>chunk of code outside the default ^C handler which is doing this echoing
>(the BIOS keystroke handler, maybe?), but I thought I'd check before trying
>to hunt it down myself.  Any suggestions?

To quote an old DOS reference manual :- "If the Ctrl-Break interrupts
functions 9 or 10, buffered I/O, then C, carriage-return, and linefeed are
output."

This implies that you will need to make sure that you do not use buffered
I/O to/from the console when that buffering is performed by DOS via Int 21H,
functions 9 or 10.