Re: Jon Relay's Apple II Info Archives: Memory Area Summary

[jonINTERNETrelayCHAT@napaVALLEYnet.CLARInet (Jon Bettencourt)]

Wow! That's more info than I originally wanted to know! Thanks! I'll be
sure to add it.

In article <1e5x58i.1907mw1t1hs6sN%dempson@actrix.gen.nz>,
dempson@actrix.gen.nz (David Empson) wrote:

> Jon Bettencourt <jonINTERNETrelayCHAT@napaVALLEYnet.CLARInet> wrote:
> 
> > $0200 - $02FF (512 - 767): Applesoft BASIC Input Buffer
> 
> This is the input buffer for more than just Applesoft BASIC.  It is
> actually the buffer for the monitor's GETLN subroutine, which is used by
> both Applesoft and Integer BASIC as well as the monitor itself (and the
> Mini-Assembler).  There are other programs which use this routine as
> well.
> 
> > $9600 - $9CFF (38400 - 40191): DOS and ProDOS Disk I/O Buffers
> 
> Both DOS 3.3 and ProDOS can use memory below $9600 for buffers.  This is
> controlled by the MAXFILES command in DOS, and by the number of open
> files in ProDOS (actually BASIC.SYSTEM, not the ProDOS kernel).
> 
> The BASIC.SYSTEM I/O buffers end at $99FF, with code starting at $9A00.
> 
> > $9D00 - $BFFF (40192 - 49151): DOS or ProDOS Routines
> 
> $9A00 - $BEFF Is BASIC.SYSTEM (not present if you are writing a ProDOS
> SYS application).  $BF00-$BFFF is the ProDOS kernel's global page.
> 
> > $C100 - $C7FF (49408 - 51199): Peripheral Card Memory
> > $C800 - $CFFF (51200 - 53247): Extended Memory for Peripheral Card in Use
> > -- or --
> > $C100 - $C2FF (49408 - 49919): Extensions to System Monitor
> > $C300 - $C3FF (49920 - 50175): 80-Column Display Routines
> > $C400 - $C7FF (50176 - 51199): Self-Test Routines
> > $C800 - $CFFF (51200 - 53247): More 80-Column Display Routines 
> 
> These descriptions apply mainly to the IIe.  The IIc may have a slightly
> different arrangement, and I'm sure the IIgs does.  None of this exists
> on the ][ or ][+.
> 
> > $D000 - $F7FF (53248 - 63487): Applesoft Interpreter
> > $F800 - $FFFF (63488 - 65535): System Monitor
> 
> Also note $E000-$F7FF are Integer BASIC and miscellaneous support
> routines (including the Mini-Assembler and Sweet-16 interpreter) on an
> original Apple ][ (or a ][+ with an Integer BASIC ROM card, or under
> Integer BASIC loaded into RAM in DOS 3.3).  $D000-$D7FF is usually the
> "Programmer's Aid #1" ROM in this configuration.  I'm not sure what goes
> in $D800-$DFFF in the RAM-based INTBASIC.  (It is usually an empty
> socket in a ][ or an Integer BASIC ROM card.)
> 
> > $D000 - $DFFF (53248 - 57343): Bank-Switched RAM
> > $E000 - $FFFF (57344 - 65535): More RAM
> 
> The whole $D000-$FFFF area is called "Bank-switched RAM" in the IIe and
> later machines.  There are two 4K banks at $D000-$DFFF, and a further 8K
> shared between the banks at $E000-$FFFF.
> 
> In the ][ or ][+, this memory area only exists if a "language card" is
> installed in slot 0.  We old timers tend to call this area the "language
> card" even in the IIe and later machines.
> 
> -- 
> David Empson
> dempson@actrix.gen.nz
> Snail mail: P O Box 27-103, Wellington, New Zealand

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