NetNews Usenet Archive 1993 #1/NN_1993_1.iso/spool/comp/sys/apple2/26846

Text File | 1993-01-12 | 1.8 KB | 42 lines

Newsgroups: comp.sys.apple2
Path: sparky!uunet!utcsri!geac!censor!comspec!feline!gray
From: [e-mail] (Kelly Gray)
Subject: Re: Lowercase characters for Apple][ +
Message-ID: <[e-mail]>
Sender: Kelly Gray
Organization: Humber College Technology Dept.
References: <[e-mail]> <[e-mail]>
Date: Tue, 12 Jan 1993 18:06:12 GMT
Lines: 30

In article <[e-mail]> [e-mail] (SARDJONO INSANI) writes:
>
>thanks for the suggestion, but I tried that method before and my apple
>][ + still won't produce lowercase characters. I was told that I need to
>replace a chip on the motherboard. Anybody can tell me where to get this
>chip?
>
It sounds like what you need is a modification of the contents of the
ROM. The standard RDKEY routine used by Applesoft will force all
characters to upper case by doing a logical and of the keyboard
character and $DF. Changing the $DF to $FF eliminates the conversion,
but has a couple of problems. First, Applesoft on a II+ cannot
understand lower case characters, so any BASIC programming would have to
be done with one finger holding down the shift key. 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.

 The simplist thing for you do do would probably be to have your
programs read the keyboard directly. With the switch on the keyboard set
to lowercase, the value that shows up at $C000 will be lowercase, and
your program can then do whatever it wants with it.


--

<o_o>    Kelly Gray
         [e-mail] (preferred)
         [e-mail]