Path: utzoo!attcan!uunet!lll-winken!lll-lcc!ames!mailrus!csd4.milw.wisc.edu!uxc!uxc.cso.uiuc.edu!uxg.cso.uiuc.edu!uxe.cso.uiuc.edu!leonardr
From: leonardr@uxe.cso.uiuc.edu
Newsgroups: comp.sys.mac.programmer
Subject: Re: Text Drawing at speeds in excess of
Message-ID: <226000053@uxe.cso.uiuc.edu>
Date: 17 Jan 89 16:53:00 GMT
References: <2220@uokmax.UUCP>
Lines: 32
Nf-ID: #R:uokmax.UUCP:2220:uxe.cso.uiuc.edu:226000053:000:1793
Nf-From: uxe.cso.uiuc.edu!leonardr    Jan 17 10:53:00 1989


grg@berlin.acss.umn.edu(* *) writes in comp.sys.mac.programmer

>Here's how to speed up your serial I/O to screen.  I wish Red Ryder and
>Microphone were listening.
>
>(1)  Don't use drawchar.  There's too much overhead in drawing 1 char at a time.Try gathering 5-20 chars at a time and then drawing them all at once with
>DrawText or DrawString.  This should help a lot.  You'll need to special
>case the processing of control characters and escape sequences though.  You'll
>also need a timeout to flush the last 5-20 characters.  A bit messy but this
>is the only way you can go above 1200 baud on a plain Mac.
>
>(2) You then may find the bottleneck is in scrolling the screen.  You can
>speed this up by scrolling up several lines at a time.  This is somewhat ugly
>but at 9600 baud the eye can barely tell if you're scrolling 1 line or 3 lines
>at a time.

   Well as one of the authors of MicroPhone II, I can say that not only have
we been listening but if you look closely you will see that the current 
shipping version of MicroPhone II does both of the above.


+---------------------------------+-----------------------------------+
+                                 +  Any thing I say may be taken as  +
+   Leonard Rosenthol             +  fact, then again you might decide+
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