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89 lines
5.2 KiB
Plaintext
89 lines
5.2 KiB
Plaintext
; See the LICENSE file for distribution terms (Apache 2.0).
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;
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; Parts adapted from multiple sources:
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;
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; - Project 64, 64MAP10.TXT, June 1996, etext #41
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; http://unusedino.de/ec64/technical/project64/memory_maps.html
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;
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; - "Mapping the Commodore 64", by Sheldon Leemon
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; Compute! Publications Inc. (1984), ISBN 0-942386-23-X
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; https://archive.org/details/Compute_s_Mapping_the_Commodore_64
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*SYNOPSIS RAM locations used by BASIC
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ADRAY1 @ $0003 2 ;Vector: Convert FAC to Integer in (A/Y) ($b1aa)
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ADRAY2 @ $0005 2 ;Vector: Convert int in (A/Y) to float in (FAC) ($b391)
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CHARAC @ $0007 ;Search Character/Temporary Integer during INT
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ENDCHR @ $0008 ;Flag: Scan for Quote at end of String
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INTEGR @ $0007 ;Temporary Integer during OR/AND
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TRMPOS @ $0009 ;Screen Column for last TAB
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VERCK @ $000a ;Flag: 0 = Load, 1 = Verify
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COUNT @ $000b ;Input Buffer Pointer/Number of Subscripts
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DIMFLG @ $000c ;Flag: Default Array dimension
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VALTYP @ $000d ;Data type Flag: $00 = Numeric, $FF = String
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INTFLG @ $000e ;Data type Flag: $00 = Floating point, $80 = Integer
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GARBFL @ $000f ;Flag: DATA scan/List Quote/Garbage collection
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SUBFLG @ $0010 ;Flag: Subscript reference/User Function call
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INPFLG @ $0011 ;Input Flag: $00 = INPUT, $40 = GET, $98 = READ
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TANSGN @ $0012 ;Flag: TAN sign/Comparative result
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CHANNL @ $0013 ;File number of current Input Device
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LINNUM @ $0014 2 ;Temporary: Integer value
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TEMPPT @ $0016 ;Pointer: Temporary String Stack
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LASTPT @ $0017 2 ;Last temporary String Address
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TEMPST @ $0019 9 ;Stack for temporary Strings
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INDEX1 @ $0022 2 ;First Utility Pointer
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INDEX2 @ $0024 2 ;Second Utility Pointer
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RESHO @ $0026 5 ;Floating point product of Multiply and Divide
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TXTTAB @ $002b 2 ;Pointer: Start of BASIC Text Area ($0801)
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VARTAB @ $002d 2 ;Pointer: Start of BASIC Variables
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ARYTAB @ $002f 2 ;Pointer: Start of BASIC Arrays
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STREND @ $0031 2 ;Pointer: End of BASIC Arrays + 1
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FRETOP @ $0033 2 ;Pointer: Bottom of String space
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FRESPC @ $0035 2 ;Utility String Pointer
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MEMSIZ @ $0037 2 ;Pointer: Highest Address available to BASIC ($a000)
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CURLIN @ $0039 2 ;Current BASIC Line number
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OLDLIN @ $003b 2 ;Previous BASIC Line number
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OLDTXT @ $003d 2 ;Pointer: BASIC Statement for CONT
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DATLIN @ $003f 2 ;Current DATA Line number
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DATPTR @ $0041 2 ;Pointer: Used by READ - current DATA Item Address
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INPPTR @ $0043 2 ;Pointer: Temporary storage of Pointer during INPUT Routine
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VARNAM @ $0045 2 ;Name of Variable being sought in Variable Table
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VARPNT @ $0047 2 ;Pointer: to value of (VARNAM) if Int, to descriptor if Str
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FORPNT @ $0049 2 ;Pointer: Index Variable for FOR/NEXT loop
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VARTXT @ $004b 2 ;Temporary storage for TXTPTR during READ, INPUT and GET
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OPMASK @ $004d ;Mask used during FRMEVL
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TEMPF3 @ $004e 2 ;Temporary storage for FLPT value
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FOUR6 @ $0053 ;Length of String Variable during Garbage collection
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JMPER @ $0054 3 ;jmp used in Function Evaluation
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TEMPF1 @ $0057 10 ;Temporary storage for FLPT value
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TEMPF2 @ $005c ;Temporary storage for FLPT value
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FACEXP @ $0061 ;FAC Exponent
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FACHO @ $0062 4 ;FAC Mantissa
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FACSGN @ $0066 ;FAC Sign
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SGNFLG @ $0067 ;Pointer: Series Evaluation Constant
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BITS @ $0068 ;Bit Overflow Area during normalisation Routine
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ARGEXP @ $0069 ;AFAC Exponent
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ARGHO @ $006a 4 ;AFAC Mantissa
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ARGSGN @ $006e ;AFAC Sign
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ARISGN @ $006f ;Sign of result of Arithmetic Evaluation
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FACOV @ $0070 ;FAC low-order rounding
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FBUFPT @ $0071 2 ;Pointer: Used during CRUNCH/ASCII conversion
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CHRGET @ $0073 ;Subroutine: Get next Byte of BASIC Text
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CHRGOT @ $0079 ;Entry to Get same Byte again
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TXTPTR @ $007a 2 ;Pointer: Current Byte of BASIC Text
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RNDX @ $008b 5 ;Floating RND Function Seed Value
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BSTACK @ $013f ;BASIC Stack Area
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BUF @ $0200 ;BASIC Input Buffer (Input Line from Screen)
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IERROR @ $0300 2 ;Vector: BASIC Error ($e38b)
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IMAIN @ $0302 2 ;Vector: BASIC Input Line ($a483)
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ICRNCH @ $0304 2 ;Vector: BASIC Tokenise ($a57c)
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IQPLOP @ $0306 2 ;Vector: BASIC LIST ($a71a)
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IGONE @ $0308 2 ;Vector: BASIC Character ($a7e4)
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IEVAL @ $030a 2 ;Vector: BASIC Token ($ae86)
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SAREG @ $030c ;Storage for 6510 Accumulator during SYS
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SXREG @ $030d ;Storage for 6510 X-Register during SYS
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SYREG @ $030e ;Storage for 6510 Y-Register during SYS
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SPREG @ $030f ;Storage for 6510 Status Register during SYS
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USRPOK @ $0310 ;USR Function JMP Instruction ($4c)
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USRADD @ $0311 ;USR Address ($LB,$MB)
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