Path: utzoo!attcan!utgpu!news-server.csri.toronto.edu!clyde.concordia.ca!altitude!gammal
From: gammal@CAM.ORG (Michael Gammal)
Newsgroups: comp.sys.apple2
Subject: Re: Multitasking on a II
Message-ID: <1990Dec23.034902.12921@CAM.ORG>
Date: 23 Dec 90 03:49:02 GMT
References: <289@generic.UUCP>
Organization: Altitude.CAM.ORG, St-Lambert QC  CANADA
Lines: 21

ericmcg@pnet91.cts.com (Eric Mcgillicuddy) writes:

>The 65C02 and 65816 have two uninteruptible instruction, TSB and TRB. These
>are Test and Set (or Reset) Bit. Perhaps the *RESET line would prevent
>interuption, but nothing else will stop them from completing their function
>(usually marking a semaphore). Any subsequent accesses to the semaphore will
>show it as being in use. I hope Prodos uses this for the "PRODOS_BUSY" flag
>and for locking Handles. (?).

>These instructions take 5-7 cycles to execute, so they damn well better work
>as advertised, eh?

I have a program made by a friend's friend called IIe.MultiTask and apparently
it works very well...(I personally have never used it but some friends of mine
say it's pretty good)   

I brought this up as I was wondering if it would be of use to anyone as I could
put it in comp.binaries.apple2 if necessary.

-- 
Michael Gammal		Concordia University		M.Gammal@CAM.ORG