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c64mem_jb.txt
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c64mem_jb.txt
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- C64 RAM Map (Jim Butterfield)
-
- Butterfield, Jim [compiled by]:
- COMMODORE 64 MEMORY MAP
- Classic Computer Magazine Archive COMPUTE! issue 29, October 1982, p.150
-
- https://www.atarimagazines.com/compute/issue29/394_1_COMMODORE_64_MEMORY_MAP.php
- https://www.atariarchives.org/mlb/appendix_b.php
- https://archive.org/details/1982-10-compute-magazine/page/n153/mode/2up
-
- 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 Chip directional register
$0001 R6510 Chip I/O; memory & tape control
$0003-$0004 ADRAY1 Float-Fixed vector
$0005-$0006 ADRAY2 Fixed-Float vector
$0007 CHARAC Search character
$0008 ENDCHR Scan-quotes flag
$0009 TRMPOS TAB column save
$000A VERCK 0 = LOAD, 1 = VERIFY
$000B COUNT Input buffer pointer/# subscrpt
$000C DIMFLG Default DIM flag
$000D VALTYP Type : FF = string, 00 = numeric
$000E INTFLG Type : 80 = integer, 00 = floating point
$000F GARBFL DATA scan/LIST quote/memry flag
$0010 SUBFLG Subscript/FNx flag
$0011 INPFLG 0 = INPUT; $40 = GET; $98 = READ
$0012 TANSGN ATN sign/Comparison eval flag
$0013 CHANNL Current I/O prompt flag
$0014-$0015 LINNUM Integer value
$0016 TEMPPT Pointer : temporary strg stack
$0017-$0018 LASTPT Last temp string vector
$0019-$0021 TEMPST Stack for temporary strings
$0022-$0025 INDEX Utility pointer area
$0026-$002A RES Product area for multiplication
$002B-$002C TXTTAB Pointer : Start-of-Basic
$002D-$002E VARTAB Pointer : Start-of-Variables
$002F-$0030 ARYTAB Pointer : Start-of-Arrays
$0031-$0032 STREND Pointer : End-of-Arrays
$0033-$0034 FRETOP Pointer : String-storage(moving down)
$0035-$0036 FRESPC Utility string pointer
$0037-$0038 MEMSIZ Pointer : Limit-of-memory
$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 Current DATA address
$0043-$0044 INPPTR Input vector
$0045-$0046 VARNAM Current variable name
$0047-$0048 VARPNT Current variable address
$0049-$004A FORPNT Variable pointer for FOR/NEXT
$004B-$004C VARTXT Y-save; op-save; Basic pointer save
$004D OPMASK Comparison symbol accumulator
$004E-$0053 Misc work area, pointer, etc
$0054-$0056 JMPER Jump vector for functions
$0057-$0060 Misc numeric work area
$0061 FACEXP Accum#l : Exponent
$0062-$0065 FACHO Accum#l : Mantissa
$0066 FACSGN Accum#l : Sign
$0067 SGNFLG Series evaluation constant pointer
$0068 BITS Accum#l hi-order (over flow)
$0069-$006E ARG Accum#2 : Exponent, etc.
$006F ARISGN Sign comparison, Acc#l vs #2
$0070 FACOV Accum#l lo-order (rounding)
$0071-$0072 FBUFPT Cassette buff len/Series pointer
$0073-$008A CHRGET CHRGET subroutine; get Basic char
$007A-$007B TXTPTR Basic pointer (within subrtn)
$008B-$008F RNDX RND seed value
$0090 STATUS Status word ST
$0091 STKEY Keyswitch PIA : STOP and RVS flags
$0092 SVXT Timing constant for tape
$0093 VERCK Load = 0, Verify = l
$0094 C3P0 Serial output : deferred char flag
$0095 BSOUR Serial deferred character
$0096 SYNO Tape EOT received
$0097 XSAV Register save
$0098 LDTND How many open files
$0099 DFLTN Input device, normally 0
$009A DFLTO Output CMD device, normally 3
$009B PRTY Tape character parity
$009C DPSW Byte-received flag
$009D MSGFLG Direct = $80/RUN = 0 output control
$009E PTR1 Tp Pass 1 error log/char buffer
$009F PTR2 Tp Pass 2 err log corrected
$00A0-$00A2 TIME Jiffy Clock HML
$00A3 R2D2 Serial bit count/EOI flag
$00A4 FIRT Cycle count
$00A5 CNTDN Countdown, tape write/bit count
$00A6 BUFPT Tape buffer pointer
$00A7 INBIT Tp Wrt ldr count/Rd pass/inbit
$00A8 BITCI Tp Wrt new byte/Rd error/inbit cnt
$00A9 RINONE Wrt start bit/Rd bit err/stbit
$00AA RIDATA Tp Scan; Cnt; Ld; End/byte assy
$00AB RIPRTY Wr lead length/Rd checksum/parity
$00AC-$00AD Pointer : tape bufr, scrolling
$00AE-$00AF Tape end adds/End of program
$00B0-$00B1 Tape timing constants
$00B2-$00B3 TAPE1 Pntr : start of tape buffer
$00B4 BITTS l = Tp timer enabled; bit count
$00B5 NXTBIT Tp EOT/RS232 next bit to send
$00B6 RODATA Read character error/outbyte buf
$00B7 FNLEN # characters in file name
$00B8 LA Current logical file
$00B9 SA Current secndy address
$00BA FA Current device
$00BB-$00BC FNADR Pointer to file name
$00BD ROPRTY Wr shift word/Rd input char
$00BE FSBLK # blocks remaining to Wr/Rd
$00BF MYCH Serial word buffer
$00C0 CAS1 Tape motor interlock
$00C1-$00C2 STAL I/O start address
$00C3-$00C4 MEMUSS Kernel setup pointer
$00C5 LSTX Last key pressed
$00C6 NDX # chars in keybd buffer
$00C7 RVS Screen reverse flag
$00C8 INDX End-of-line for input pointer
$00C9-$00CA Input cursor log (row, column)
$00CB SFDX Which key : 64 if no key
$00CC BLNSW 0 = flash cursor
$00CD BLNCT Cursor timing countdown
$00CE GDBLN Character under cursor
$00CF BLNON Cursor in blink phase
$00D0 CRSW Input from screen/from keyboard
$00D1-$00D2 PNT Pointer to screen line
$00D3 PNTR Position of cursor on above line
$00D4 QTSW 0 = direct cursor, else programmed
$00D5 LNMX Current screen line length
$00D6 TBLX Row where curosr lives
$00D7 DATA Last inkey/checksum/buffer
$00D8 INSRT # of INSERTs outstanding
$00D9-$00F2 LDTB1 Screen line link table
$00F3-$00F4 USER Screen color pointer
$00F5-$00F6 KEYTAB Keyboard pointer
$00F7-$00F8 RIBUF RS-232 Rev pntr
$00F9-$00FA ROBUF RS-232 Tx pntr
$00FF-$010A BASZPT Floating to ASCII work area
$0100-$01FF Processor stack area
$0100-$013E BAD Tape error log
$0200-$0258 BUF Basic input buffer
$0259-$0262 LAT Logical file table
$0263-$026C FAT Device # table
$026D-$0276 SAT Sec Adds table
$0277-$0280 KEYD Keybd buffer
$0281-$0282 MEMSTR Start of Basic Memory
$0283-$0284 MEMSIZ Top of Basic Memory
$0285 TIMOUT Serial bus timeout flag
$0286 COLOR Current color code
$0287 GDCOL Color under cursor
$0288 HIBASE Screen memory page
$0289 XMAX Max size of keybd buffer
$028A RPTFLG Repeat all keys
$028B KOUNT Repeat speed counter
$028C DELAY Repeat delay counter
$028D SHFLAG Keyboard Shift/Control flag
$028E LSTSHF Last shift pattern
$028F-$0290 KEYLOG Keyboard table setup pointer
$0291 MODE Keyboard shift mode
$0292 AUTODN 0 = scroll enable
$0293 M51CTR RS-232 control reg
$0294 M51CDR RS-232 command reg
$0295-$0296 M51AJB Bit timing
$0297 RSSTAT RS-232 status
$0298 BITNUM # bits to send
$0299-$029A BAUDOF RS-232 speed/code
$029B RIDBE RS232 receive pointer
$029C RIDBS RS232 input pointer
$029D RODBS RS232 transmit pointer
$029E RODBE RS232 output pointer
$029F-$02A0 IRQTMP IRQ save during tape I/O
$02A1 ENABL CIA 2 (NMI) Interrupt Control
$02A2 CASTON CIA 1 Timer A control log
$02A3 KIKA26 CIA 1 Interrupt Log
$02A4 STUPID CIA 1 Timer A enabled flag
$02A5 LINTMP Screen row marker
$0300-$0301 IERROR Error message link
$0302-$0303 IMAIN Basic warm start link
$0304-$0305 ICRNCH Crunch Basic tokens link
$0306-$0307 IQPLOP Print tokens link
$0308-$0309 IGONE Start new Basic code link
$030A-$030B IEVAL Get arithmetic element link
$030C SAREG SYS A-reg save
$030D SXREG SYS X-reg save
$030E SYREG SYS Y-reg save
$030F SPREG SYS status reg save
$0310-$0312 USRPOK USR function jump ($B248)
$0314-$0315 CINV Hardware interrupt vector ($EA31)
$0316-$0317 CBINV Break interrupt vector ($FE66)
$0318-$0319 NMINV NMI interrupt vector ($FE47)
$031A-$031B IOPEN OPEN vector ($F34A)
$031C-$031D ICLOSE CLOSE vector ($F291)
$031E-$031F ICHKIN Set - input vector ($F20E)
$0320-$0321 ICKOUT Set - output vector ($F250)
$0322-$0323 ICLRCH Restore I/0 vector ($F333)
$0324-$0325 IBASIN INPUT vector ($F157)
$0326-$0327 IBSOUT Output vector ($F1CA)
$0328-$0329 ISTOP Test-STOP vector ($F6ED)
$032A-$032B IGETIN GET vector ($F13E)
$032C-$032D ICLALL Abort I/o vector ($F32F)
$032E-$032F USRCMD Warm start vector ($FE66)
$0330-$0331 ILOAD LOAD link ($F4A5)
$0332-$0333 ISAVE SAVE link ($F5ED)
$033C-$03FB TBUFFR Cassette buffer