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- From: Klaus_Seistrup@magneto.bbs.bad.se (Klaus Seistrup)
- Newsgroups: comp.sys.amiga.programmer
- Subject: Re: PAL or NTSC, how to check in software ?
- Message-ID: <OA92-910-102_15712804@piraya.bad.se>
- Date: Tue, 3 Nov 92 21:45:44 +0000
- References: <Jesse_Michael.012a@amwbbs.rain.com>
- Sender: BadNet@piraya.bad.se
- Reply-To: Klaus_Seistrup@magneto.bbs.bad.se (Klaus Seistrup)
- Distribution: world
- Organization: Magnetic Ink, Copenhagen N, Denmark
- OD-Comment-To: Jesse_Michael
- Lines: 37
-
-
- Jesse_Michael@amwbbs.rain.com (Jesse Michael) writes:
-
- K>> NTSC: CLR.W $DFF1DC
- K>> RTS
-
- JM> *NEVER* use a CLR instruction on a custom chip register! On a 68000
- JM> this will produce a read/write instead of just a write.
-
- Well, why don't you just post me the correct solution then? _I_ didn't know
- this (where can I read about this???), but it actually *works* on my 68010!?
-
- Would
-
- MOVEQ #0,D0
- MOVE.W D0,$DFF1DC
-
- be any better??? Or, what are your suggestions?
-
- K>> So you might like to fiddle around peeking the $DFF1DC, I guess...
-
- JM> $dff1dc is a `write only' register (as are most custom chip regs) and
- JM> reading from it will not give any valid data and will write a random
- JM> value to it.
-
- Didn't know -- where can I find any refereces on this???
-
- /Klaus.
-
-
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