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Re: A few technical q's from an apple newbie
- Subject: Re: A few technical q's from an apple newbie
- From: mjmahon@aol.com (Michael J. Mahon)
- Date: 04 Nov 2004 02:41:18 GMT
- Newsgroups: comp.sys.apple2
- Organization: AOL http://www.aol.com
- References: <4187ff84$0$21885$5a62ac22@per-qv1-newsreader-01.iinet.net.au>
- Xref: g2news1.google.com comp.sys.apple2:5424
Mark McDougall replied:
<snip>
>> The high bit of $C019 goes low during the VBL period, which starts
>> at line 192 and continues to line 261. (Each line is approximately
>> 64 cycles.)
>
>Since all the video timing on the prototype is linked to the VGA output,
>I've generated a 'fake' 60Hz vsync/vblank (nominally 1460us since that's
>what Centipede uses). But looks like it's not required for ][+...
I'm sure you intended something other than 1460us, since the
correct period is closer to 16700us... ;-)
-michael
Check out parallel computing for 8-bit Apples on my
Home page: http://members.aol.com/MJMahon/