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- Path: informatik.tu-muenchen.de!fischerj
- From: fischerj@Informatik.TU-Muenchen.DE (Juergen "Rally" Fischer)
- Newsgroups: comp.sys.amiga.programmer
- Subject: Re: need help on A1200/030 board programming
- Date: 20 Feb 1996 01:49:12 GMT
- Organization: Technische Universitaet Muenchen, Germany
- Distribution: inet
- Message-ID: <4gb9ao$104@sunsystem5.informatik.tu-muenchen.de>
- References: <4f4hiu$oum@ionews.io.org> <38232327@kone.fipnet.fi> <1596.6622T138T1200@wr.com.au>
- NNTP-Posting-Host: hphalle5.informatik.tu-muenchen.de
- X-Newsreader: TIN [version 1.2 PL2]
-
- Accolyte (accolyte@wr.com.au) wrote:
-
- : > WHY ? you can do
- : >
- : > loop:
- : > move.l d0,(a0)+
- : > dbra d7,loop
- : >
- : > this will store 7mb/sec on A1200 and 4mb/sec on A4000.
- : > the code is compatible, so what do you mean ?
-
- : Sorry, I didn't mean compatible. I mean "to make your code work
- : on computers with slower access times to chip".
- : > just test for it. won't make anything slower.
- : I don't, that'd be crazy. it's just that I'm using 95% of that 7mb/sec
-
- Testing for blitter ready is not crazy.
-
- : on a 1200 without fastmem, so I guess it'd drop into 2 frames on a
- : 4000 without fast :\
-
- yes, but I would not call this "not working". And if you use
- tripple buffering, 4mb/sec-platforms won't drop to 2 frames.
- And if they run it on a A4000 without fastmem, well... ;)
-
- : >|> > There are exceptions, for example cpu-scroll in chipmem. Will be just
-
- : Still, even ignoring caches; A copy loop from one chip buffer to another
- : chip buffer, is slower on my accelerated 1200 than it is without the card
- : installed. That bites.. <sigh>
-
- yep, for things like shell-scrolling. But most other fx are fastmemable.
-
-