/
c64mem_64map.txt
322 lines (319 loc) · 15.9 KB
/
c64mem_64map.txt
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- C64 RAM Map (64MAP10.TXT)
-
- Anonymous
- Commodore_64_Memory_Maps.txt
- in: 64MAP10.TXT, which states ftp://arnold.hiof.no/programs
- as the original source
-
- 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. Free for user programs.
$0003-$0004 ADRAY1 Jump Vector: Convert FAC to Integer in (A/Y)
($B1AA).
$0005-$0006 ADRAY2 Jump Vector: Convert Integer in (A/Y) to
Floating point in (FAC); ($B391).
$0007-$0008 Temporary Integer during OR/AND.
$0007 CHARAC Search Character/Temporary Integer during INT.
$0008 ENDCHR Flag: Scan for Quote at end of String.
$0009 TRMPOS Screen Column for last TAB.
$000A VERCK Flag: 0 = Load, 1 = Verify.
$000B COUNT Input Buffer Pointer/Number of Subscripts.
$000C DIMFLG Flag: Default Array dimension.
$000D VALTYP Data type Flag: $00 = Numeric, $FF = String.
$000E INTFLG Data type Flag: $00 = Floating point, $80 =
Integer.
$000F GARBFL Flag: DATA scan/List Quote/Garbage collection.
$0010 SUBFLG Flag: Subscript reference/User Function call.
$0011 INPFLG Input Flag: $00 = INPUT, $40 = GET, $98 =
READ.
$0012 TANSGN Flag: TAN sign/Comparative result.
$0013 CHANNL File number of current Input Device.
$0014-$0015 LINNUM Temporary: Integer value.
$0016 TEMPPT Pointer: Temporary String Stack.
$0017-$0018 LASTPT Last temporary String Address.
$0019-$0021 TEMPST Stack for temporary Strings.
$0022-$0025 INDEX Utility Pointer Area.
$0022-$0023 INDEX1 First Utility Pointer.
$0024-$0025 INDEX2 Secong Utility Pointer.
$0026-$002A RES Floating point product of Multiply and
Divide.
$002B-$002C TXTTAB Pointer: Start of BASIC Text Area ($0801).
$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 space.
$0035-$0036 FRESPC Utility String Pointer.
$0037-$0038 MEMSIZ Pointer: Highest Address available to BASIC
($A000).
$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: Used by READ - current DATA Item
Address.
$0043-$0044 INPPTR Pointer: Temporary storage of Pointer during
INPUT Routine.
$0045-$0046 VARNAM Name of Variable being sought in Variable
Table.
$0047-$0048 VARPNT Pointer: to value of (VARNAM) if Integer, to
descriptor if String.
$0049-$004A FORPNT Pointer: Index Variable for FOR/NEXT loop.
$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 Garbege
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-$0066 FAC Main Floating point Accumulator.
$0061 FACEXP FAC Exponent.
$0062-$0065 FACHO FAC Mantissa.
$0066 FACSGN FAC Sign.
$0067 SGNFLG Pointer: Series Evaluation Constant.
$0068 BITS Bit Overflow Area during normalisation
Routine.
$0069-$006E ARG Auxiliary Floating point Accumulator.
$0069 ARGEXP AFAC Exponent.
$006A-$006D AFAC Mantissa.
$006E ARGSGN AFAC Sign.
$006F ARISGN Sign of result of Arithmetic Evaluation.
$0070 FACOV FAC low-order rounding.
$0071-$0072 FBUFPT Pointer: Used during CRUNCH/ASCII conversion.
$0073-$008A CHRGET Subroutine: Get next Byte of BASIC Text.
,0073 INC $7A
,0075 BNE $0079
,0077 INC $7B
,0079 LDA $0801
,007C CMP #$3A
,007E BCS $008A
,0080 CMP #$20
,0082 BEQ $0073
,0084 SEC
,0085 SBC #$30
,0087 SEC
,0088 SBC #$D0
,008A RTS
$0079 CHRGOT Entry to Get same Byte 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: $7F = STOP key.
$0092 SVXT Timing Constant for Tape.
$0093 VERCK Flag: 0 = Load, 1 = Verify.
$0094 C3P0 Flag: Serial Bus - Output Character buffered.
$0095 BSOUR Buffered Character for Serial Bus.
$0096 SYNO Cassette Sync. number.
$0097 XSAV Temporary storage of X Register during CHRIN.
Temporary storage of Y Register during RS232
fetch.
$0098 LDTND Number of Open Files/Index to File Table.
$0099 DFLTN Default Input Device (0).
$009A DFLTO Default Output Device (3).
$009B PRTY Parity of Byte Output to Tape.
$009C DPSW Flag: Byte received from Tape.
$009D MSGFLG Flag: $00 = Program mode: Suppress Error
Messages, $40 = Kernal Error Messages only,
$80 = Direct mode: Full Error Messages.
$009E PTR1 Tape Error log pass 1.
$009E T1 Index to Cassette File name/Header ID for
Tape write.
$009F PTR2 Tape Error log pass 2.
$00A0-$00A2 TIME Real-time jiffy Clock (Updated by IRQ
Interrupt approx. every 1/60 of Second);
Update Routine: UDTIMK ($F69B).
$00A3 Bit Counter Tape Read or Write/Serial Bus
EOI (End Of Input) Flag.
$00A4 Pulse Counter Tape Read or Write/Serial Bus
shift Counter.
$00A5 CNTDN Tape Synchronising count down.
$00A6 BUFPT Pointer: Tape I/O buffer.
$00A7 INBIT RS232 temporary for received Bit/Tape
temporary.
$00A8 BITCI RS232 Input Bit count/Tape temporary.
$00A9 RINONE RS232 Flag: Start Bit check/Tape temporary.
$00AA RIDATA RS232 Input Byte Buffer/Tape temporary.
$00AB RIPRTY RS232 Input parity/Tape temporary.
$00AC-$00AD Pointer: Tape Buffer/Screen scrolling.
$00AE-$00AF Tape End Address/End of Program.
$00B0-$00B1 Tape timing Constants.
$00B2-$00B3 TAPE1 Pointer: Start Address of Tape Buffer ($033C).
$00B4 BITTS RS232 Write bit count/Tape Read timing Flag.
$00B5 NXTBIT RS232 Next Bit to send/Tape Read - End of
Tape.
$00B6 RODATA RS232 Output Byte Buffer/Tape Read Error Flag.
$00B7 FNLEN Number of Characters in Filename.
$00B8 LA Current File - Logical File number.
$00B9 SA Current File - Secondary Address.
$00BA FA Current File - First Address (Device number).
OPEN LA,FA,SA; OPEN 1,8,15,"I0":CLOSE 1
$00BB-$00BC FNADR Pointer: Current File name Address.
$00BD ROPRTY RS232 Output Parity/Tape Byte to be Input or
Output.
$00BE FSBLK Tape Input/Output Block count.
$00BF MYCH Serial Word Buffer.
$00C0 CAS1 Tape Motor Switch.
$00C1-$00C2 STAL Start Address for LOAD and Cassette Write.
$00C3-$00C4 MEMUSS Pointer: Type 3 Tape LOAD and general use.
$00C5 LSTX Matrix value of last Key pressed; No Key = $40.
$00C6 NDX Number of Characters in Keyboard Buffer
queue.
$00C7 RVS Flag: Reverse On/Off; On = $01, Off = $00.
$00C8 INDX Pointer: End of Line for Input (Used to
suppress trailing spaces).
$00C9-$00CA Cursor X/Y (Line/Column) position at start of
Input.
$00CB SFDX Flag: Print shifted Characters.
$00CC BLNSW Flag: Cursor blink; $00 = Enabled, $01 =
Disabled.
$00CD BLNCT Timer: Count down for Cursor blink toggle.
$00CE GDBLN Character under Cursor while Cursor Inverted.
$00CF BLNON Flag: Cursor Status; $00 = Off, $01 = On.
$00D0 CRSW Flag: Input from Screen = $03, or Keyboard =
$00.
$00D1-$00D2 PNT Pointer: Current Screen Line Address.
$00D3 PNTR Cursor Column on current Line, including
Wrap-round Line, if any.
$00D4 QTSW Flag: Editor in Quote Mode; $00 = Not.
$00D5 LNMX Current logical Line length: 39 or 79.
$00D6 TBLX Current Screen Line number of Cursor.
$00D7 DATA Screen value of current Input Character/Last
Character Output.
$00D8 INSRT Count of number of inserts outstanding.
$00D9-$00F2 LDTB1 Screen Line link Table/Editor temporaries.
High Byte of Line Screen Memory Location.
$00F3-$00F4 USER Pointer: Current Colour RAM Location.
$00F5-$00F6 KEYTAB Vector: Current Keyboard decoding Table.
($EB81)
$00F7-$00F8 RIBUF RS232 Input Buffer Pointer.
$00F9-$00FA ROBUF RS232 Output Buffer Pointer.
$00FB-$00FE FREKZP Free Zero Page space for User Programs.
$00FF-$010A Assembly Area for Floating point to ASCII
conversion.
$0100-$01FF 6510 Hardware Stack Area.
$0100-$013E BAD Tape Input Error log.
$013F-$01FF BASIC Stack Area.
$0200-$0258 BUF BASIC Input Buffer (Input Line from Screen).
$0259-$0262 LAT Kernal Table: Active logical File numbers.
$0263-$026C FAT Kernal Table: Active File First Addresses
(Device numbers).
$026D-$0276 SAT Kernal Table: Active File Secondary
Addresses.
$0277-$0280 KEYD Keyboard Buffer Queue (FIFO).
$0281-$0282 MEMSTR Pointer: Bottom of Memory for Operating
System ($0800).
$0283-$0284 MEMSIZ Pointer: Top of Memory for Operating
System ($A000).
$0285 TIMOUT Serial IEEE Bus timeout defeat Flag.
$0286 COLOR Current Character Colour code.
$0287 GDCOL Background Colour under Cursor.
$0288 HIBASE High Byte of Screen Memory Address ($04).
$0289 XMAX Maximum number of Bytes in Keyboard
Buffer ($0A).
$028A RPTFLG Flag: Repeat keys; $00 = Cursors, INST/DEL &
Space repeat, $40 no Keys repeat, $80 all
Keys repeat ($00).
$028B KOUNT Repeat Key: Speed Counter ($04).
$028C DELAY Repeat Key: First repeat delay Counter ($10).
$028D SHFLAG Flag: Shift Keys: Bit 1 = Shift, Bit 2 = CBM,
Bit 3 = CTRL; ($00 = None, $01 = Shift, etc.).
$028E LSTSHF Last Shift Key used for debouncing.
$028F-$0290 KEYLOG Vector: Routine to determine Keyboard table
to use based on Shift Key Pattern ($EB48).
$0291 MODE Flag: Upper/Lower Case change: $00 = Disabled,
$80 = Enabled ($00).
$0292 AUTODN Flag: Auto scroll down: $00 = Disabled ($00).
$0293 M51CTR RS232 Pseudo 6551 control Register Image.
$0294 M51CDR RS232 Pseudo 6551 command Register Image.
$0295-$0296 M51AJB RS232 Non-standard Bits/Second.
$0297 RSSTAT RS232 Pseudo 6551 Status Register Image.
$0298 BITNUM RS232 Number of Bits left to send.
$0299-$029A BAUDOF RS232 Baud Rate; Full Bit time microseconds.
$029B RIDBE RS232 Index to End of Input Buffer.
$029C RIDBS RS232 Pointer: High Byte of Address of Input
Buffer.
$029D RODBS RS232 Pointer: High Byte of Address of Output
Buffer.
$029E RODBE RS232 Index to End of Output Buffer.
$029F-$02A0 IRQTMP Temporary store for IRQ Vector during Tape
operations.
$02A1 ENABL RS232 Enables.
$02A2 CASTON TOD sense during Tape I/O.
$02A3 KIKA26 Temporary storage during Tape READ.
$02A4 STUPID Temporary D1IRQ Indicator during Tape READ.
$02A5 LINTMP Temporary for Line Index.
$02A6 PALNTS Flag: TV Standard: $00 = NTSC, $01 = PAL.
$02A7-$02FF Unused.
$0300-$0301 IERROR Vector: Indirect entry to BASIC Error
Message, (X) points to Message ($E38B).
$0302-$0303 IMAIN Vector: Indirect entry to BASIC Input Line
and Decode ($A483).
$0304-$0305 ICRNCH Vector: Indirect entry to BASIC Tokenise
Routine ($A57C).
$0306-$0307 IQPLOP Vector: Indirect entry to BASIC LIST
Routine ($A71A).
$0308-$0309 IGONE Vector: Indirect entry to BASIC Character
dispatch Routine ($A7E4).
$030A-$030B IEVAL Vector: Indirect entry to BASIC Token
evaluation ($AE86).
$030C SAREG Storage for 6510 Accumulator during SYS.
$030D SXREG Storage for 6510 X-Register during SYS.
$030E SYREG Storage for 6510 Y-Register during SYS.
$030F SPREG Storage for 6510 Status Register during SYS.
$0310 USR Function JMP Instruction ($4C).
$0311-$0312 USRADD USR Address ($LB,$MB).
$0313 Unused.
$0314-$0315 CINV Vector: Hardware IRQ Interrupt Address ($EA31).
$0316-$0317 CBINV Vector: BRK Instruction Interrupt Address
($FE66).
$0318-$0319 NMINV Vector: Hardware NMI Interrupt Address ($FE47).
$031A-$031B IOPEN Vector: Indirect entry to Kernal OPEN
Routine ($F34A).
$031C-$031D ICLOSE Vector: Indirect entry to Kernal CLOSE
Routine ($F291).
$031E-$031F ICHKIN Vector: Indirect entry to Kernal CHKIN
Routine ($F20E).
$0320-$0321 ICKOUT Vector: Indirect entry to Kernal CHKOUT
Routine ($F250).
$0322-$0323 ICLRCH Vector: Indirect entry to Kernal CLRCHN
Routine ($F333).
$0324-$0325 IBASIN Vector: Indirect entry to Kernal CHRIN
Routine ($F157).
$0326-$0327 IBSOUT Vector: Indirect entry to Kernal CHROUT
Routine ($F1CA).
$0328-$0329 ISTOP Vector: Indirect entry to Kernal STOP
Routine ($F6ED).
$032A-$032B IGETIN Vector: Indirect entry to Kernal GETIN
Routine ($F13E).
$032C-$032D ICLALL Vector: Indirect entry to Kernal CLALL
Routine ($F32F).
$032E-$032F USRCMD User Defined Vector ($FE66).
$0330-$0331 ILOAD Vector: Indirect entry to Kernal LOAD
Routine ($F4A5).
$0332-$0333 ISAVE Vector: Indirect entry to Kernal SAVE
Routine ($F5ED).
$0334-$033B Unused.
$033C-$03FB TBUFFR Tape I/O Buffer.
$03FC-$03FF Unused.