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Re: Language Card RAM Question?
- Subject: Re: Language Card RAM Question?
- From: mjmahon@aol.com (Michael J. Mahon)
- Date: 08 Jul 2002 02:43:57 GMT
- Newsgroups: comp.sys.apple2
- Organization: AOL http://www.aol.com
- References: <HP2W8.594270$Gs.38446367@bin5.nnrp.aus1.giganews.com>
- Xref: archiver1.google.com comp.sys.apple2:21100
Bryan Parkoff asked:
>Language Card RAM Question?
>
> I understand that AppleSoft BASIC is stored in $00/D000-$00/F7FF and
>Integer BASIC is stored in $01/E000-$01/F7FF. They are both on IIe, IIc,
>and IIgs. It is not possible on II/II+ because 6502 microprocessor can only
>handle memory up to 64K.
> I assume that language card has two separate RAMs. Both RAMS points to
>$D000-$F7FF on II/II+. The language card has its own work to swap both RAMs
>when we switch between Integer BASIC and AppleSoft BASIC. What do you
>think?
I think you've got it.
The 8-bit Apple II's cannot address more than 64KB at a time, so both
ROM contents cannot be simultaneously addressible, but they can be
bank switched in and out, so that both languages are accessible at
different times without doing any disk I/O.
-michael
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