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- From: 9LORKIN@WINVMJ.VNET.IBM.COM ("Julian Lorkin")
- Newsgroups: comp.sys.amiga.programmer
- Subject: Disk drive timing.... (without AmigaDOS)
- Message-ID: <9207240938.AA08170@ucbvax.Berkeley.EDU>
- Date: 24 Jul 92 09:37:29 GMT
- Sender: daemon@ucbvax.BERKELEY.EDU
- Lines: 20
-
- How can you idle your Amiga for a fixed amount of time?
-
- Busy waiting the CPU in a closed loop is out of the question because a
- 68030 will execute this loop faster than a 68000. Is counting raster
- lines reliable? Like this . . .
-
- nextrast move.b dff006,d1
- waitrast cmp.b dff006,d1
- beq.s waitrast
- dbf d0,nextrast
-
- Would this work on all screen modes? and on all types of Amiga?
-
- Another method might be to use the CIAs but the driving input is
- different on PAL and NTSC machines. How big is this difference? Is it
- big enough to cause problems?
-
- Thanks in advance...
-
- Dave.
-