Re: Lowercase characters for Apple][ +

[gray@feline.uucp (Kelly Gray)]

In article <1j076qINN98j@usenet.INS.CWRU.Edu> ah499@cleveland.Freenet.Edu (John Daniels) writes:
>
>gray@feline.uucp (Kelly Gray) writes:
> 
>>Second, the ROMS in a II+ are not quite the same as a standard 2716
>>EPROM. It is possible to make a replacement, but the simple way makes
>>it impossible to use a language card, and the complicated way involves
>>building an inverter into the chip socket.
>
>Only on the ][ and earliest ][+ machines do you need a special chip for the
>character ROM.  On a Rav.7 or later with the encoder board slung under
>the keyboard a standard 2716 with the appropriate characterset does fine.
>
>						John Daniels
>						ah499@cleveland.freenet.edu
>

   The ROM that I was referring to is _not_ the character ROM. The RDKEY
subroutine located in the F8 ROM (the leftmost of the six next to the
CPU) contains an instruction that forces all keyboard characters to
uppercase, even if the keyboard is generating lowercase characters. If
you are using a program that reads the keyboard directly, this will
have no effect, but any BASIC program will use this subroutine and so be
unable to get lowercase characters from the keyboard. Modifying the F8
ROM will get around this problem, at the expense of requiring a caps
lock key (or holding down the shift key) while typing any applesoft
program code.
-- 

<o_o>    Kelly Gray
         gray@feline.uucp (preferred)
         gray@admin.humberc.on.ca