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From: allen@grebyn.com (Allen H. Farrington)
Newsgroups: comp.sys.amiga.hardware
Subject: 875-line (RS343) Video and the Amiga
Keywords: RS343 Video 875-line
Message-ID: <20419@grebyn.com>
Date: 17 Jul 90 01:09:53 GMT
Sender: allen@grebyn.com
Lines: 22


Video DMA / Hardware Guru's:

Prolog: I define RS343, 875-line video as 809 lines by 1080 columns at
        60Hz, 2:1 interlace, and 4:3 Aspect Ratio giving a total of 873720
        pixels (active, of course.)

Would it be possible to generate (with a stock Amiga (2000 or 3000)) an
RS343, 875-line Video output?  Adding a card would be ok, but no mods
to the motherboard are allowed.  Another requirement is that the machine
must be usable normally except when the actual 875-video is displayed.

In looking at the hardware specs for the A2000, I wonder if you could
disable the normal DMA for the audio, sprites, and video and have enough
time to get four bit-planes worth of video out of the machine.

Is this more likely with an A3000 or is it do-able with an A2000 and the ECS?
What is possible with the programmable modes of the ECS Denise?

Any takers?

  --Allen