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140 lines
8.8 KiB
Plaintext
140 lines
8.8 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 the KERNAL
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STATUS @ $0090 ;Kernal I/O Status Word ST
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STKEY @ $0091 ;Flag: $7f = STOP key
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SVXT @ $0092 ;Timing Constant for Tape
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VERCKK @ $0093 ;Flag: 0 = Load, 1 = Verify
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C3PO @ $0094 ;Flag: Serial Bus - Output Character buffered
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BSOUR @ $0095 ;Buffered Character for Serial Bus
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SYNO @ $0096 ;Cassette Sync. number
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TEMPX @ $0097 ;Temporary storage of X Register during CHRIN
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TEMPY @ $0097 ;Temporary storage of Y Register during RS232 fetch
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LDTND @ $0098 ;Number of Open Files/Index to File Table
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DFLTN @ $0099 ;Default Input Device (0)
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DFLTO @ $009a ;Default Output Device (3)
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PRTY @ $009b ;Parity of Byte Output to Tape
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DPSW @ $009c ;Flag: Byte received from Tape
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MSGFLG @ $009d ;Set error message mode
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FNMIDX @ $009e ;Index to Cassette File name/Header ID for Tape write
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PTR1 @ $009e ;Tape Error log pass 1
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PTR2 @ $009f ;Tape Error log pass 2
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TIME @ $00a0 ;Real-time jiffy Clock, Update Routine: UDTIMK ($f69b)
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TSFCNT @ $00a3 ;Bit Counter Tape Read or Write/Serial Bus
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TBTCNT @ $00a4 ;Pulse Counter Tape Read or Write/Serial Bus shift Counter
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CNTDN @ $00a5 ;Tape Synchronising count down
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BUFPNT @ $00a6 2 ;Pointer: Tape I/O buffer
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INBIT @ $00a7 ;RS232 temporary for received Bit/Tape
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BITC1 @ $00a8 ;RS232 Input Bit count/Tape temporary
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RINONE @ $00a9 ;RS232 Flag: Start Bit check/Tape temporary
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RIDATA @ $00aa ;RS232 Input Byte Buffer/Tape temporary
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RIPRTY @ $00ab ;RS232 Input parity/Tape temporary
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SAL @ $00ac 2 ;Pointer: Tape Buffer/Screen scrolling
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EAL @ $00ae ;Tape End Address/End of Program
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CMPO @ $00b0 ;Tape timing Constants
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TAPE1 @ $00b2 2 ;Pointer: Start Address of Tape Buffer ($033c)
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BITTS @ $00b4 ;RS232 Write bit count/Tape Read timing Flag
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NXTBIT @ $00b5 ;RS232 Next Bit to send/Tape Read - End of Tape
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RODATA @ $00b6 ;RS232 Output Byte Buffer/Tape Read Error Flag
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FNLEN @ $00b7 ;Number of Characters in Filename
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LA @ $00b8 ;Current File - Logical File number
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SA @ $00b9 ;Current File - Secondary Address
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FA @ $00ba ;Current File - First Address (Device number)
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FNADR @ $00bb 2 ;Pointer: Current File name Address
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ROPRTY @ $00bd ;RS232 Output Parity/Tape Byte to be Input or Output
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FSBLK @ $00be ;Tape Input/Output Block count
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MYCH @ $00bf ;Serial Word Buffer
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CAS1 @ $00c0 ;Tape Motor Switch
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STAL @ $00c1 ;Start Address for LOAD and Cassette Write
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MEMUSS @ $00c3 2 ;Pointer: Type 3 Tape LOAD and general use
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LSTX @ $00c5 ;Matrix value of last Key pressed; No Key = $40
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NDX @ $00c6 ;Number of Characters in Keyboard Buffer queue
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RVS @ $00c7 ;Flag: Reverse On/Off; On = $01, Off = $00
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INDX @ $00c8 2 ;Pointer: End of Line for Input
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LXSP @ $00c9 ;Cursor X/Y (Line/Column) position at start of Input
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SFDX @ $00cb ;Flag: Print shifted Characters
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BLNSW @ $00cc ;Flag: Cursor blink; $00 = Enabled, $01 = Disabled
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BLNCT @ $00cd ;Timer: Count down for Cursor blink toggle
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GDBLN @ $00ce ;Character under Cursor while Cursor Inverted
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BLNON @ $00cf ;Flag: Cursor Status; $00 = Off, $01 = On
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CRSW @ $00d0 ;Flag: Input from Screen = $03, or Keyboard = $00
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PNT @ $00d1 2 ;Pointer: Current Screen Line Address
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PNTR @ $00d3 ;Cursor Column on current Line, including Wrap-round Line, if any
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QTSW @ $00d4 ;Flag: Editor in Quote Mode; $00 = Not
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LNMX @ $00d5 ;Current logical Line length: 39 or 79
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TBLX @ $00d6 ;Current Screen Line number of Cursor
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SCHAR @ $00d7 ;Screen value of current Input Character/Last Character Output
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INSRT @ $00d8 ;Count of number of inserts outstanding
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LDTB1 @ $00d9 ;Screen Line link Table/Editor temporaries
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USER @ $00f3 2 ;Pointer: Current Colour RAM Location
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KEYTAB @ $00f5 2 ;Vector: Current Keyboard decoding Table ($eb81)
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RIBUF @ $00f7 2 ;RS232 Input Buffer Pointer
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ROBUF @ $00f9 2 ;RS232 Output Buffer Pointer
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FREKZP @ $00fb ;Free Zero Page space for User Programs
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BASZPT @ $00ff ;BASIC temporary Data Area
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ASCWRK @ $00ff ;Assembly Area for Floating point to ASCII conversion
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LAT @ $0259 10 ;Kernal Table: Active logical File numbers
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FAT @ $0263 10 ;Kernal Table: Active File First Addresses
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SAT @ $026d 10 ;Kernal Table: Active File Secondary Addresses
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KEYD @ $0277 10 ;Keyboard Buffer Queue (FIFO)
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MEMSTR @ $0281 2 ;Pointer: Bottom of Memory for Operating System ($0800)
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MEMSIZ2 @ $0283 2 ;Pointer: Top of Memory for Operating System ($a000)
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TIMOUT @ $0285 ;Serial IEEE Bus timeout defeat Flag
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COLOR @ $0286 ;Current Character Colour code
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GDCOL @ $0287 ;Background Colour under Cursor
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HIBASE @ $0288 ;High Byte of Screen Memory Address ($04)
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XMAX @ $0289 ;Maximum number of Bytes in Keyboard Buffer ($0a)
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RPTFLG @ $028a ;Flag: Repeat keys setting
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KOUNT @ $028b ;Repeat Key: Speed Counter ($04)
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DELAY @ $028c ;Repeat Key: First repeat delay Counter ($10)
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SHFLAG @ $028d ;flags for shift, CBM, CTRL
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LSTSHF @ $028e ;Last Shift Key used for debouncing
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KEYLOG @ $028f 2 ;Vector: Routine to determine Keyboard table to use
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MODE @ $0291 ;Flag: Upper/Lower Case change
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AUTODN @ $0292 ;Flag: Auto scroll down: $00 = Disabled ($00)
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M51CTR @ $0293 ;RS232 Pseudo 6551 control Register Image
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M51CDR @ $0294 ;RS232 Pseudo 6551 command Register Image
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M51AJB @ $0295 ;RS232 Non-standard Bits/Second
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RSSTAT @ $0297 ;RS232 Pseudo 6551 Status Register Image
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BITNUM @ $0298 ;RS232 Number of Bits left to send
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BAUDOF @ $0299 ;RS232 Baud Rate; Full Bit time microseconds
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RIDBE @ $029b ;RS232 Index to End of Input Buffer
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RIDBS @ $029c 2 ;RS232 Pointer: High Byte of Address of Input Buffer
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RODBS @ $029d 2 ;RS232 Pointer: High Byte of Address of Output Buffer
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RODBE @ $029e ;RS232 Index to End of Output Buffer
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IRQTMP @ $029f 2 ;Temporary store for IRQ Vector during Tape operations
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ENABL @ $02a1 ;RS232 Enables
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TODSNS @ $02a2 ;TOD sense during Tape I/O
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TRDTMP @ $02a3 ;Temporary storage during Tape READ
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TD1IRQ @ $02a4 ;Temporary D1IRQ Indicator during Tape READ
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TLNIDX @ $02a5 ;Temporary for Line Index
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TVSFLG @ $02a6 ;Flag: TV Standard: $00 = NTSC, $01 = PAL
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CINV @ $0314 2 ;Vector: Hardware IRQ Interrupt ($ea31)
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CNBINV @ $0316 2 ;Vector: BRK Instruction Interrupt ($fe66)
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NMINV @ $0318 2 ;Vector: Hardware NMI Interrupt ($fe47)
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IOPEN2 @ $031a 2 ;Vector: Kernal OPEN Routine ($f34a)
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ICLOSE2 @ $031c 2 ;Vector: Kernal CLOSE Routine ($f291)
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ICHKIN2 @ $031e 2 ;Vector: Kernal CHKIN Routine ($f20e)
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ICKOUT2 @ $0320 2 ;Vector: Kernal CHKOUT Routine ($f250)
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ICLRCH2 @ $0322 2 ;Vector: Kernal CLRCHN Routine ($f333)
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IBASIN2 @ $0324 2 ;Vector: Kernal CHRIN Routine ($f157)
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IBSOUT2 @ $0326 2 ;Vector: Kernal CHROUT Routine ($f1ca)
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ISTOP2 @ $0328 2 ;Vector: Kernal STOP Routine ($f6ed)
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IGETIN2 @ $032a 2 ;Vector: Kernal GETIN Routine ($f13e)
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ICLALL2 @ $032c 2 ;Vector: Kernal CLALL Routine ($f32f)
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USRCMD2 @ $032e 2 ;User Defined Vector ($fe66)
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ILOAD2 @ $0330 2 ;Vector: Kernal LOAD Routine ($f4a5)
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ISAVE2 @ $0332 2 ;Vector: Kernal SAVE Routine ($f5ed)
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TBUFFR @ $033c 192 ;start of Tape I/O Buffer
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VICSCN @ $0400 1024 ;start of Default Screen Video Matrix
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