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From: mikey@bbimg.UUCP
Newsgroups: comp.sys.tandy
Subject: Re: Model 4
Message-ID: <-3915066@bbimg>
Date: Tue, 21-Apr-87 08:56:00 EST
Article-I.D.: bbimg.-3915066
Posted: Tue Apr 21 08:56:00 1987
Date-Received: Sat, 25-Apr-87 08:23:05 EST
References: <863@wjvax.wjvax.UUCP>
Lines: 13
Nf-ID: #R:wjvax.wjvax.UUCP:863:bbimg:-3915066:000:538
Nf-From: bbimg.UUCP!mikey    Apr 21 07:56:00 1987




Early LDOS had some strange things in the keyboard scan/typeahead.  Originally
the entire keyboard scan was called, which took a lot of time.  Later releases
scanned ALL the lines, i.e., the address selected set ALL 8 address lines
of the keyboard grid and it looked for ANY output on the data lines.  If it
found something, it then went back and did a regular keyboard scan.  This
speeded the OS up a LOT and got rid of a lot of wierd little problems.

				Mike Yetsko 
				Boston's Beth Israel Hospital
				trsvax!techsup!bbimg!mikey