Re: does anyone know what the apple /// interlace upgade does?

[shack@onyx.southwind.net (Randy Shackelford)]

Mitchell Spector (spec@vax2.concordia.ca) wrote:

: >I picked up a couple apple/// interlace upgades at a computer junk store a
: >while back and haven't figured out that it does. It comes with a patch cord
: >that has a switch on one end, and the other has a plug in on the other. the kit
: >also come with a chip ( i don't have it in front of me).

:     Well the Apple III Plus supported an interlaced graphic mode, which
: was made activate with a user flippable switch in the side of the case.
: The interlace mode doubled the vertical resolution, so you could get
: modes like 240x384 and 560x384 (the latter is higher than a B&W Mac!).

My III plus manual is in a box in the attic now, but from my recollection
from reading it I think the switch causes the display to become sharper
but retains the same resolution. In any event, I can see little difference
in the display with the interlacer switched on from the way it looks with
it turned off.

:     I'm only guessing here, but what you have sounds like an upgrade to
: add the same graphic interlace feature to the standard Apple III.

Sounds reasonable
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