Subject: Re: AppleSoft memory usage
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From: rich12345@my-deja.com
Newsgroups: comp.sys.apple2.programmer
Date: Fri, 30 Jun 2000 23:49:04 GMT
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In article <8je5lj$806$1@nnrp1.deja.com>,
  bobryan9@my-deja.com wrote:
> I am looking for the following:
>
> Memory locations containing:



From Appendix L: Applesoft Zero Page Usage (pg 140-141 applesoft II
basic programming reference manual)

Location(s)
(in hex)              (use)
-------------------------------------------------------------
$0-$5        Jump instructions to continue in APPLESOFT
             (reset 0G return for applesoft is equivalent
to
             reset ctrl C return for integer BASIC

$A-$C        Location for USR Functions jump instruction.
             See USR function description

$D-$17       General purpose counters/flags for applesoft.

$20-$4F      APPLE II system monitor reserved locations

$50-$61      General purpose pointers for APPLESOFT.

$62-$66      Result of last multiply/divide

$67-$68      Pointer to beginning of program.  Normally
             set to $0801 for ROM version or $3001
             for RAM (cassette tape) version

$69-$6a      Pointer to start of simple variable space.  Also
             points to end of the program plus 1 or 2,
             unless changed with LOMEM: statement

$6b-$6C      Pointer to beginning of array space

$6D-$6e      Pointer to end of numering storage in use

$6f-$70      pointer to start of string storage.  Strings are
             stored from here to the end of memory
$71-$72      General pointer

$73-$74      Highest location in memory available to APPLESOFT
             plus one.  Upon initial entry to Applesoft, is
             set to the highest RAM memory location available

$75-$76      Current line number being executed

$77-$78      "old line nyumber". set up by a ctrl c, STOP
             or end statement.  Gives line number at which
             execution was interrupted.

$79-$7A      "old text pointer". points to location in memory
             for statement to be executed next.

$7B-$7C      Current line number from which DATA is being read.

$7D-$7E      Points to absolute location in memory from which
             DATA is being READ.

$7F-$80      Pointer to current source of INPUT.  Set to $201
             during and INPUT statement.  During a READ
             statement is set to the DATA in the program
             it is READing from

$81-$82      Holds the last-used variable's name.

$83-$84      Pointer to the last-used variable's value.

$85-$9C      General Usage

$9D-$A3      Main floating point accumulator.

$A4          General use in floating poing math routines

$A5-$AB      Secondary floating point accumulator

$AC-$AE      General usage flags/pointers

$AF-$b0      Pointer to end of program (NOT changend by LOMEM: )

$B1-$C8      CHRGET routine.  Applesoft calls here
             everytime it wants another character

$B8-$B9      Pointer to last character obtained through
             the CHRGET routine.

$c9-$CD      Random Number

$D0-$D5      High-resolution graphics scratch pointers

$D8-$DF      Onerr pointers/scratch.

$E0-$E2      High-resolution graphics X and Y coordinates.

$E4          High-resolution graphics color byte

$E5-$E7      General use for High-resolution graphics.

$E8-$E9      Pointer to beginning of shape table

$EA          Collision counter for high-resolution graphics.

$F0-$F3      General use flags

$F4-$F8      Onerr pointers


Rich


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