Re: German IIe Question and ROM/JEDEC Link

[heuser.marcus@freenet.de]

David Wilson wrote:
>
> This is not coreect. On the PAL motherboard the keyboard switch affects
> both the keyboard and video. See the circuit diagram on page 8-18 of
> "Understanding the Apple IIe" by Jim Sather. The switch generates a
> signal called ALTCHR' which is connected to A10 (pin 19) of the
> keyboard ROM [2716] and to A12 (pin 2) of the video ROM [2764].

You are right.

I just checked both a PAL and an International NTSC board by looking at
the circuit board (I hope to get my book -German version- in one or two
weeks) - they connect the switch to both ROMs.

Now I know that I'm getting old - I knew this a year earlier!


> The US motherboard has the same sized keyboard ROM and has a Dvorak
> layout in the 2nd half but no switch to select it (unlike the IIc).

I guess that with a bit soldering and some keycap exchanging you could
have a functioning Dvorak keyboard?
There was a certain craze about the Dvorak layout for a time but didn't
know that there actually was support built in.

Thanks for clearing this up!

bye
Marcus