Re: NTSC Apple //e mainboard: Connectors?

[Linards Ticmanis <ticmanis@gmx.de>]

David Wilson wrote:
> Linards Ticmanis wrote:
>> It occurred to me though that I could simply have used a 2732 chip
>> instead with a single external wire soldered to it, no need to use a
>> real adapter or go hunting for exotic EPROMs, since half of the 2764
>> isn't used at all. Two Apple fonts occupy only 4K, not 8K.
> 
> Each half of the 2764 (PAL IIe) chargen has one copy of the font
> (256x8=2048 bytes) plus another 2048 bytes of LORES & HIRES bit
> patterns (unlike the II(+) which generates the graphics with other
> logic).

I found this out too shortly after I wrote the above... when my graphics
were suddenly rendered useless because I had simply connected A11 to GND.

Though I have to admit I don't quite understand the role of those patterns.

-- 
Linards Ticmanis