Flush keyboard buffer

Article View: comp.os.msdos.programmer

Article #6246

Back to comp.os.msdos.programmer Previous Next

#6246

From: Lee Hollingworth
Date: Fri, 01 Jan 1993 02:16

17 lines
1139 bytes

I am writing a screen blanking TSR (yes another one :-) using assembly,
and I am at a loss as to how to flush the keyboard buffer when the user
presses a key to restore the saved screen.

I have installed my own ISR to chain the INT16h ROM BIOS keyboard driver.
Therefore the keyboard buffer must be cleared before returning to the
interrupted program, otherwise the keypress remains in the buffer and is
read with the next buffer read.

I have an idea that I should be able to read the buffer from Port 60h,
and flush the buffer by reading and writing to Port 61h, but I'm not
sure this is right, or indeed how to do it properly.

Any ideas would be greatly appreciated.

Lee Hollingworth
s1110238@giaeb.cc.monash.edu.au

Technical Details

Message-ID: <s1110238.725854615@giaeb>

Path: arc1-ca.pugleaf.net!sparky!uunet!munnari.oz.au!bruce.cs.monash.edu.au!monu6!giaeb!s1110238

Show Full Headers

Complete Article Headers

Newsgroups: comp.os.msdos.programmer
Path: arc1-ca.pugleaf.net!sparky!uunet!munnari.oz.au!bruce.cs.monash.edu.au!monu6!giaeb!s1110238
From: s1110238@giaeb.cc.monash.edu.au (Lee Hollingworth)
Subject: Flush keyboard buffer
Message-ID: <s1110238.725854615@giaeb>
Sender: news@monu6.cc.monash.edu.au (Usenet system)
Organization: Monash University, Melb., Australia.
Date: Fri, 1 Jan 1993 02:16:55 GMT
Lines: 18