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1991-08-05
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Article 148 of comp.sources.amiga:
Path: fishpond!mcdphx!asuvax!cs.utexas.edu!sdd.hp.com!elroy.jpl.nasa.gov!news.larc.nasa.gov!amiga-request
From: amiga-request@ab20.larc.nasa.gov (Amiga Sources/Binaries Moderator)
Newsgroups: comp.sources.amiga
Subject: v91i095: CpuBlit 1.0 - speeds up blitter on a 68020/30 Amiga, Part01/02
Message-ID: <comp.sources.amiga:v91i095@ab20.larc.nasa.gov>
Date: 7 May 91 23:45:27 GMT
Reply-To: ecarroll%maths.tcd.ie@pucc.PRINCETON.EDU
Lines: 1731
Approved: tadguy@uunet.UU.NET (Tad Guy)
X-Mail-Submissions-To: amiga@uunet.uu.net
X-Post-Discussions-To: comp.sys.amiga.misc
Submitted-by: ecarroll%maths.tcd.ie@pucc.PRINCETON.EDU
Posting-number: Volume 91, Issue 095
Archive-name: utilities/cpublit-1.0/part01
[ includes uuencoded executable and icons ...tad ]
CpuBlit replaces the system BltBitMap routine with a version that uses your
68020/68030 when it is worthwhile to do so. This results in text scrolling
twice as fast as usual, and in addition, the "colour flicker" effect normally
present when scrolling multi-coloured text is removed.
One advantage of the blitter is that while it is busy manipulating bitmaps,
the CPU can be getting on with some other work. To facilitate this, you can
tell CpuBlit to only use the CPU for blitting when it would otherwise be idle
(i.e. no tasks are ready to run). This way, you get increased speed without
affecting your Amiga's overall computing performance.
If your Amiga only has a 68000, CpuBlit probably won't be of much use other
than as a curiosity since the 68000 is slower than the blitter.
This is V1.0, which fixes all known bugs in earlier versions available from
ab20.larc.nasa.gov and bix.
--
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