Re: PPC to A][ to TV

[nathan@visi.com (Nathan Mates)]

In article <schneegurt.1-0605981159260001@kulpa.bio.nd.edu>,
Mark <schneegurt.1@nd.edu> wrote:
>This is probably a dumb question and I am not particularly familiar with
>the Apple ][s.  I know that A][s can use a regular TV as a monitor. My PPC
>cannot do that unless I have a special converter or board, something like
>a Snappy. Can an A][ be used as a converter?

   Not without designing enough addon circuitry to make the Apple II
almost irrelevant in the setup. Apple IIs had circuitry to send a
certain number of video modes (all at lower resolutions than a PPC
would want to spit out) to NTSC/PAL, but there is no video input
capabilities at all in a stock Apple II. [Some rare addon boards could
take NTSC in, but computer monitor signals are way more detailed than
NTSC]

   Designing stuff that can take 30-70Khz horizontal sync pulses and
60+ Hz vertical refresh signals and spitting out NTSC would normally
require dedicated circuitry. And, as noted above, trying to rasterize
such a signal down so that an Apple II video mode could display it
would look pretty yucky. Spend the $ on an external [S]VGA -> NTSC
converter, and that'll look way better in the long run.

Nathan Mates
--
<*> Nathan Mates http://www.visi.com/~nathan/      <*>
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