Re: AppleColor 100 RGB Monitor Problem

["Bryan Parkoff" <nospam@nospam.com>]

> I hate to bump an old post (actually I can't, but I can bring the
> topic up again), but I'm curious if anyone has found a solution to my
> problem yet (well the monitor related problem anyway).
>
> If anyone remembers, I have an AppleColor 100 RGB Monitor that I want
> to hook up to my Apple IIe.  The monitor works great, except on some
> games where the whole screen goes monochrome on me.  Some games also
> have very blurry text that is almost impossible to read (such as
> Prince of Persia).  I'd really like to find some hardware fix that
> works on all games rather than a software patch that has to be loaded
> each time if possible.

    I sent you an e-mail about over a year ago.  I asked you a question to 
see if AppleColor 100 RGB's 16 colors are identical to Apple IIgs' 16 colors 
using Double High Resolution.  Please let me know.

    Your AppleColor 100 RGB Monitor looks fine without any problem like you 
said above.  It is not RGB card problem.  You are talking about Double 
High-Resolution.  It has 4 switches below.  It is not necessary to fix 
hardware nor patch software.  They are likely incompatible to RGB card.  It 
is designed to use NTSC only.  If you insist to use RGB card, it is only the 
option to patch software like you said earlier.  You may need to find some 
empty hex bytes after 60 RTS.  You can add machine code to try Option 1 or 
Option 2 below.  It gives more room to modify.

Mode 0 - Strip Color
Mode 1 - Monochrome
Mode 2 - Mixed Monochrome & Color
Mode 3 - Color

    The switch is located on $C05E.  Some games always use Mode 3.  You may 
notice unreadable text in 80 column because it uses Mode 3.  It needs to use 
Mode 2.  All monochrome bytes are $00-$7F and all color bytes are $80-$FF. 
They are adjusted 7 pixels per byte.
    I would suggest you to try.  Reboot while you do not boot from 5.25" 
disk.  Return to Applesoft BASIC and type CALL-151 to go into monitor 
prompt.  Type by the following below.

Option 1:
*C05E <Return>
*C05F <Return>
*C05E <Return>
*C600G

Option 2:
*C05E <Return>
*C05F <Return>
*C05E <Return>
*C05F <Return>
*C05E <Return>
*C600G

    Use either option 1 or option 2 to see if you are able to use Mixed 
Monochrome & Color Mode 2 for readable text in 80 column and for games.  All 
Sierra games use Mode 2.

    I hope this help.

Bryan Parkoff