home *** CD-ROM | disk | FTP | other *** search
- Path: ifi.uio.no!usenet
- From: ludvigp@ifi.uio.no (Ludvig Pedersen)
- Newsgroups: comp.sys.amiga.programmer
- Subject: Re: Demo/game to OS frien
- Date: 29 Feb 1996 18:04:49 GMT
- Organization: Dept. of Informatics, University of Oslo, Norway
- Message-ID: <809.6632T1184T2621@ifi.uio.no>
- References: <38232498@kone.fipnet.fi> <4gctlm$bcn@oreig.uji.es>
- <38232604@kone.fipnet.fi> <4gj3ve$f9c@sunsystem5.informatik.tu-muenchen.de>
- <642.6629T546T2374@login.eunet.no> <4gpjgi$19c@serpens.rhein.de>
- <265.6630T583T838@login.eunet.no> <4gt2ub$ban@serpens.rhein.de>
- NNTP-Posting-Host: gymir.ifi.uio.no
- X-Newsreader: THOR 2.22 (Amiga;TCP/IP)
-
- >patrick.hanevold@login.eunet.no (Patrick Hanevold) writes:
- >>>>Tell me, how do you copy memory with only writes. :)
- >>>With a write buffer ? :)
- >>>You can copy memory from fast to chip with 7M/s.
- >>Explain.
- >Just try this on an A3000. The trick is that for writing to
- >chip memory the CPU databus is only occupied for a short time.
- >If you would immediately start another write it is delayed for
- >the next chip memory slot. But it is possible to do a fast memory
- >read and still be fast enough to not miss the next chip memory
- >slot.
- >That means, a copy loop transfers 7MByte/s.
- >This is not true on the A4000/040. Probably an effect of the
- >A3640s bus interface.
- And not true for my A1200 030/50mhz either! :(
-
- <sb>Ludde - Amiga Demo Coder
- <sb>Virtual Reality & Official Be developer
- <sb>ludvigp@ifi.uio.no
-
-