
Apple II Computer Info
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### FILE : lcase.promadapt
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### Created : Thursday, April 8, 1999 Modified: Thursday, April 8, 1999
### File Type: "TEXT" File Creator: "LMAN"
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Subject: Re: II+ vs IIe Char Gen PROMs and Shift-key mods-- LC $F8 PROM mod
<david.923554356@wraith>
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Date: Thu, 08 Apr 1999 08:58:46 -0500
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David Wilson writes ...
>
> >Not as far as I know. What you do is $EA out the code which does the checking.
> >The code starts at address $FD7E in both the old and Autostart Apple II+'s
> >(which should be address $57E in a 2K $F8 PROM) ...
>
> >FD7E- C9 E0 compare the byte to the lowest ASCII value for a lower case char
> >FD80- 90 02 if the byte is less (not lower case) hop over the next two inst
bytes
> >FD82- 29 DF if the byte is lower case AND it with #$DF to force upper case
>
> The only problem with this change is that the ROMs in a ][ or ][+ are not
> pin-compatible with EPROMs of the same size. Thus, to make this change you
> would need to wire an adapter between the EPROM and the ROM socket to sort out
> the chip select polarities.
....
True. The 2516 and 2716 2k x 8 PROMs come close.
Apple II Computer Technical Information : Apple II Family Hardware Info
ftp://ground.ecn.uiowa.edu/2/apple2/miscinfo/hardware : May 2001 : 262 of 572
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