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c64mem_prg.txt
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c64mem_prg.txt
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- C64 RAM Map (Programmer's Reference Guide)
-
- Commodore 64 Programmer's Reference Guide
- Indianapolis: Howard W. Sams & Co., Inc, 1982.
- ISBN 0-672-22056-3
-
- C64PRG10.TXT, June 1996, etext #46
- converted to etext by
- Ville Muikkula
- Jouko Valta
-
- Corrections (typos as well as content), translations etc.
- welcome at: https://github.com/mist64/c64ref
-
----------------------------------------------
-
# This plain text file is formatted so that it can be automatically
# parsed in order to create cross-references etc.
# * Lines starting with "-" is top-level information. The first line
# is the title. Lines starting with "--" are separators.
# * Lines starting with "#" are internal comments.
# * Hex addresses start at column 0.
# * Symbols start at column 13.
# * The description starts at column 21.
# * All lines of the description until the first blank line are
# combined into the heading.
# * A '.' character at the end of a heading line represents a hard
# line break.
# * The remaining text is in MarkDown format.
# * All addresses are 4 digits and have a leading '$'.
# The encoding is UTF-8.
$0000 D6510 6510 On-Chip Data-Direction Register
$0001 R6510 6510 On-Chip 8-Bit Input/Output Register
$0002 Unused
$0003-$0004 ADRAY1 Jump Vector: Convert Floating-Integer
$0005-$0006 ADRAY2 Jump Vector: Convert Integer--Floating
$0007 CHARAC Search Character
$0008 ENDCHR Flag: Scan for Quote at End of String
$0009 TRMPOS Screen Column From Last TAB
$000A VERCK Flag: 0 = Load, 1 = Verify
$000B COUNT Input Buffer Pointer / No. of Subscripts
$000C DIMFLG Flag: Default Array DiMension
$000D VALTYP Data Type: $FF = String, $00 = Numeric
$000E INTFLG Data Type: $80 = Integer, $00 = Floating
$000F GARBFL Flag: DATA scan/LIST quote/Garbage Coll
$0010 SUBFLG Flag: Subscript Ref / User Function Call
$0011 INPFLG Flag: $00 = INPUT, $40 = GET, $98 = READ
$0012 TANSGN Flag TAN sign / Comparison Result
$0013 Flag: INPUT Prompt
$0014-$0015 LINNUM Temp: Integer Value
$0016 TEMPPT Pointer Temporary String
$0017-$0018 LASTPT Last Temp String Address
$0019-$0021 TEMPST Stack for Temporary Strings
$0022-$0025 INDEX Utility Pointer Area
$0022-$0023 INDEX1 First Utility Pointer.
$0024-$0025 INDEX2 Second Utility Pointer.
$0026-$002A RES Floating-Point Product of Multiply
$002B-$002C TXTTAB Pointer: Start of BASIC Text
$002D-$002E VARTAB Pointer: Start of BASIC Variables
$002F-$0030 ARYTAB Pointer: Start of BASIC Arrays
$0031-$0032 STREND Pointer End of BASIC Arrays (+1)
$0033-$0034 FRETOP Pointer: Bottom of String Storage
$0035-$0036 FRESPC Utility String Pointer
$0037-$0038 MEMSIZ Pointer: Highest Address Used by BASIC
$0039-$003A CURLIN Current BASIC Line Number
$003B-$003C OLDLIN Previous BASIC Line Number
$003D-$003E OLDTXT Pointer: BASIC Statement for CONT
$003F-$0040 DATLIN Current DATA Line Number
$0041-$0042 DATPTR Pointer: Current DATA Item Address
$0043-$0044 INPPTR Vector: INPUT Routine
$0045-$0046 VARNAM Current BASIC Variable Name
$0047-$0048 VARPNT Pointer: Current BASIC Variable Data
$0049-$004A FORPNT Pointer: Index Variable for FOR/NEXT
$004B-$0060 Temp Pointer / Data Area
$004B-$004C VARTXT Temporary storage for TXTPTR during
READ, INPUT and GET.
$004D OPMASK Mask used during FRMEVL.
$004E-$0052 TEMPF3 Temporary storage for FLPT value.
$0053 FOUR6 Length of String Variable during Garbage
collection.
$0054-$0056 JMPER Jump Vector used in Function Evaluation-
JMP followed by Address ($4C,$LB,$MB).
$0057-$005B TEMPF1 Temporary storage for FLPT value.
$005C-$0060 TEMPF2 Temporary storage for FLPT value.
$0061 FACEXP Floating-Point Accumulator #1: Exponent
$0062-$0065 FACHO Floating Accum. #1: Mantissa
$0066 FACSGN Floating Accum. #1: Sign
$0067 SGNFLG Pointer: Series Evaluation Constant
$0068 BITS Floating Accum. #1: Overflow Digit
$0069 ARGEXP Floating-Point Accumulator #2: Exponent
$006A-$006D Floating Accum. #2: Mantissa
$006E ARGSGN Floating Accum. #2: Sign
$006F ARISGN Sign Comparison Result: Accum. # 1 vs #2
$0070 FACOV Floating Accum. #1. Low-Order (Rounding)
$0071-$0072 FBUFPT Pointer: Cassette Buffer
$0073-$008A CHRGET Subroutine: Get Next Byte of BASIC Text
$0079 CHRGOT Entry to Get Same Byte of Text Again
$007A-$007B TXTPTR Pointer: Current Byte of BASIC Text
$008B-$008F RNDX Floating RND Function Seed Value
$0090 STATUS Kernal I/O Status Word: ST
$0091 STKEY Flag: STOP key / RVS key
$0092 SVXT Timing Constant for Tape
$0093 VERCK Flag: 0 = Load, 1 = Verify
$0094 C3P0 Flag: Serial Bus-Output Char. Buffered
$0095 BSOUR Buffered Character for Serial Bus
$0096 SYNO Cassette Sync No.
$0097 Temp Data Area
$0098 LDTND No. of Open Files / Index to File Table
$0099 DFLTN Default Input Device (0)
$009A DFLTO Default Output (CMD) Device (3)
$009B PRTY Tape Character Parity
$009C DPSW Flag: Tape Byte-Received
$009D MSGFLG Flag: $80 = Direct Mode, $00 = Program
$009E PTR1 Tape Pass 1 Error Log
$009F PTR2 Tape Pass 2 Error Log
$00A0-$00A2 TIME Real-Time Jiffy Clock (approx) 1/60 Sec
$00A3-$00A4 Temp Data Area
$00A5 CNTDN Cassette Sync Countdown
$00A6 BUFPT Pointer: Tape I/O Buffer
$00A7 INBIT RS-232 Input Bits / Cassette Temp
$00A8 BITCI RS-232 Input Bit Count / Cassette Temp
$00A9 RINONE RS-232 Flag: Check for Start Bit
$00AA RIDATA RS-232 Input Byte Buffer/Cassette Temp
$00AB RIPRTY RS-232 Input Parity / Cassette Short Cnt
$00AC-$00AD Pointer: Tape Buffer/ Screen Scrolling
$00AE-$00AF Tape End Addresses/End of Program
$00B0-$00B1 Tape Timing Constants
$00B2-$00B3 TAPE1 Pointer: Start of Tape Buffer
$00B4 BITTS RS-232 Out Bit Count / Cassette Temp
$00B5 NXTBIT RS-232 Next Bit to Send/ Tape EOT Flag
$00B6 RODATA RS-232 Out Byte Buffer
$00B7 FNLEN Length of Current File Name
$00B8 LA Current Logical File Number
$00B9 SA Current Secondary Address
$00BA FA Current Device Number
$00BB-$00BC FNADR Pointer: Current File Name
$00BD ROPRTY RS-232 Out Parity / Cassette Temp
$00BE FSBLK Cassette Read / Write Block Count
$00BF MYCH Serial Word Buffer
$00C0 CAS1 Tape Motor Interlock
$00C1-$00C2 STAL I/O Start Address
$00C3-$00C4 MEMUSS Tape Load Temps
$00C5 LSTX Current Key Pressed: CHR$(n) 0 = No Key
$00C6 NDX No. of Chars. in Keyboard Buffer (Queue)
$00C7 RVS Flag: Reverse Chars. - 1=Yes, 0=No Used
$00C8 INDX Pointer: End of Logical Line for INPUT
$00C9-$00CA Cursor X-Y Pos. at Start of INPUT
$00CB SFDX Flag: Print Shifted Chars.
$00CC BLNSW Cursor Blink enable: 0 = Flash Cursor
$00CD BLNCT Timer: Countdown to Toggle Cursor
$00CE GDBLN Character Under Cursor
$00CF BLNON Flag: Last Cursor Blink On/Off
$00D0 CRSW Flag: INPUT or GET from Keyboard
$00D1-$00D2 PNT Pointer: Current Screen Line Address
$00D3 PNTR Cursor Column on Current Line
$00D4 QTSW Flag: Editor in Quote Mode, $00 = NO
$00D5 LNMX Physical Screen Line Length
$00D6 TBLX Current Cursor Physical Line Number
$00D7 Temp Data Area
$00D8 INSRT Flag: Insert Mode, >0 = # INSTs
$00D9-$00F2 LDTB1 Screen Line Link Table / Editor Temps
$00F3-$00F4 USER Pointer: Current Screen Color RAM loc.
$00F5-$00F6 KEYTAB Vector Keyboard Decode Table
$00F7-$00F8 RIBUF RS-232 Input Buffer Pointer
$00F9-$00FA ROBUF RS-232 Output Buffer Pointer
$00FB-$00FE FREKZP Free 0-Page Space for User Programs
$00FF-$010A BASZPT Floating to String Work Area
$0100-$01FF Micro-Processor System Stack Area
$0100-$013E BAD Tape Input Error Log
$0200-$0258 BUF System INPUT Buffer
$0259-$0262 LAT KERNAL Table: Active Logical File No's.
$0263-$026C FAT KERNAL Table: Device No. for Each File
$026D-$0276 SAT KERNAL Table: Second Address Each File
$0277-$0280 KEYD Keyboard Buffer Queue (FIFO)
$0281-$0282 MEMSTR Pointer: Bottom of Memory for O.S.
$0283-$0284 MEMSIZ Pointer: Top of Memory for O.S.
$0285 TIMOUT Flag: Kernal Variable for IEEE Timeout
$0286 COLOR Current Character Color Code
$0287 GDCOL Background Color Under Cursor
$0288 HIBASE Top of Screen Memory (Page)
$0289 XMAX Size of Keyboard Buffer
$028A RPTFLG Flag: REPEAT Key Used, $80 = Repeat
$028B KOUNT Repeat Speed Counter
$028C DELAY Repeat Delay Counter
$028D SHFLAG Flag: Keyboard SHIFT Key/CTRL Key/C= Key
$028E LSTSHF Last Keyboard Shift Pattern
$028F-$0290 KEYLOG Vector: Keyboard Table Setup
$0291 MODE Flag: $00=Disable SHIFT Keys, $80=Enable
$0292 AUTODN Flag: Auto Scroll Down, 0 = ON
$0293 M51CTR RS-232: 6551 Control Register Image
$0294 M51CDR RS-232: 6551 Command Register Image
$0295-$0296 M51AJB RS-232 Non-Standard BPS (Time/2-100) USA
$0297 RSSTAT RS-232: 6551 Status Register Image
$0298 BITNUM RS-232 Number of Bits Left to Send
$0299-$029A BAUDOF RS-232 Baud Rate: Full Bit Time (us)
$029B RIDBE RS-232 Index to End of Input Buffer
$029C RIDBS RS-232 Start of Input Buffer (Page)
$029D RODBS RS-232 Start of Output Buffer (Page)
$029E RODBE RS-232 Index to End of Output Buffer
$029F-$02A0 IRQTMP Holds IRQ Vector During Tape I/O
$02A1 ENABL RS-232 Enables
$02A2 TOD Sense During Cassette I/O
$02A3 Temp Storage For Cassette Read
$02A4 Temp D1 IRQ Indicator For Cassette Read
$02A5 Temp For Line Index
$02A6 PAL/NTSC Flag, 0= NTSC, 1 = PAL
$02A7-$02FF Unused
$0300-$0301 IERROR Vector: Print BASIC Error Message
$0302-$0303 IMAIN Vector: BASIC Warm Start
$0304-$0305 ICRNCH Vector: Tokenize BASIC Text
$0306-$0307 IQPLOP Vector: BASIC Text LIST
$0308-$0309 IGONE Vector: BASIC Char. Dispatch
$030A-$030B IEVAL Vector: BASIC Token Evaluation
$030C SAREG Storage for 6502 .A Register
$030D SXREG Storage for 5502 .X Register
$030E SYREG Storage for 6502 .Y Register
$030F SPREG Storage for 6502 .SP Register
$0310 USR Function Jump Instr (4C)
$0311-$0312 USRADD USR Address Low Byte / High Byte
$0313 Unused
$0314-$0315 CINV Vector: Hardware Interrupt
$0316-$0317 CBINV Vector: BRK Instr. Interrupt
$0318-$0319 NMINV Vector: Non-Maskable Interrupt
$031A-$031B IOPEN KERNAL OPEN Routine Vector
$031C-$031D ICLOSE KERNAL CLOSE Routine Vector
$031E-$031F ICHKIN KERNAL CHKIN Routine
$0320-$0321 ICKOUT KERNAL CHKOUT Routine
$0322-$0323 ICLRCH KERNAL CLRCHN Routine Vector
$0324-$0325 IBASIN KERNAL CHRIN Routine
$0326-$0327 IBSOUT KERNAL CHROUT Routine
$0328-$0329 ISTOP KERNAL STOP Routine Vector
$032A-$032B IGETIN KERNAL GETIN Routine
$032C-$032D ICLALL KERNAL CLALL Routine Vector
$032E-$032F USRCMD User-Defined Vector
$0330-$0331 ILOAD KERNAL LOAD Routine
$0332-$0333 ISAVE KERNAL SAVE Routine Vector
$0334-$033B Unused
$033C-$03FB TBUFFR Tape I/O Buffer
$03FC-$03FF Unused