Re: Video "upgrade" chip

[golfrock <rtspitz@gmail.com>]

On Jul 17, 12:21 am, demp...@actrix.gen.nz (David Empson) wrote:
> golfrock <rtsp...@gmail.com> wrote:
> > I keep seeing these on eBay, #370323426845.  344S0046-C Video Graphics
> > Chip.  In my IIGS there is a 46-2 VGC.
>
> > What would be the reason to put this -C one in?
>
> If you have the original ROM 00 IIgs, generally the ones with the "Woz"
> signature stamped on the case, the original VGC (revision 0) had a
> design flaw: in monochrome double hi-res graphics mode, and for some
> combinations of foreground and background colour in 80-column text mode,
> white pixels were displayed as pink and may flicker.
>
> My original IIgs was affected by this problem. The solution was an
> official Apple upgrade to revision C of the VGC, which was part of a
> free upgrade kit along with ROM 01 (which had to be installed by an
> Apple dealer).
>
> All logic boards with the faulty VGC have it in an socket. Later models
> (e.g. ROM 3) may have the VGC soldered onto the logic board, but I
> haven't had a close look to confirm that.
> --
> David Empson
> demp...@actrix.gen.nz

OK.  Thanks.  The one I looked at is a ROM 1.  The chip is in a
socket.

Rob