Re: Changing the ASCII characters

[Rubywand <rubywand@swbell.net>]

David Empson writes ...
> 
> Rubywand <rubywand@swbell.net> wrote:
>>

      One question: The standard (non-international) IIe/Enhanced IIe
 diagram shows pin 21 (A11) going to a "GR" signal.
 ....
<<

> 
> Yes, half the IIe video ROM is occupied by graphics mode images.
 ....
> 
> There are four zones in the ROM (US/NTSC IIe).
 ....
> 
> Selecting the alternate character set provides direct access to all 256
> text characters.
 ....
> The full set of characters in the alternate character set is:
> 
> $00-$1F   Inverse upper case (control characters)
> $20-$3F   Inverse symbols
> $40-$5F   MouseText (enhanced IIe) or inverse upper case (original IIe)
> $60-$7F   Inverse lower case
> $80-$9F   Normal upper case (control characters)
> $A0-$BF   Normal symbols
> $C0-$DF   Normal upper case
> $E0-$FF   Normal lower case
>
 ....


     This is a lot of detail-- thanks! The IIe ROM/PROM is somewhat
hairier than that in the II+; but, with the above information and a good
Prommer/Reader, it should be fairly easy to zero-in on characters you
want to change and get the results you want.

 
Rubywand