Commodore VIC-20 ROM Addresses

; ; Commodore VIC-20 ROM Memory Map ; V1.0 1 Sep 1994 ; ; Data types in headers (for reassembler): ; ; DATA Misc data ; TEXT String terminated with 00 ; WORD Vectors in LO/HI byte pairs ; CHIP I/O Area ; EMPTY ROM containing FF's or AA's ; ; ; BASIC v2.0 interpreter ROM ($B000 - $DFFF) ; This is almost identical to the C64 one. ; c000 - Basic Restart Vectors WORD c004 - 'cbmbasic' DATA c00c stmdsp BASIC Command Vectors WORD c052 fundsp BASIC Function Vectors WORD c080 optab BASIC Operator Vectors WORD c09e reslst BASIC Command Keyword Table DATA c129 msclst BASIC Misc. Keyword Table DATA c140 oplist BASIC Operator Keyword Table DATA c14d funlst BASIC Function Keyword Table DATA c19e errtab Error Message Table DATA c328 errptr Error Message Pointers WORD c364 okk Misc. Messages DATA ;c364 'ok' TEXT ;c369 'error' DATA c389 - Unused byte DATA c38a fndfor Find FOR/GOSUB Entry on Stack c3b8 bltu Open Space in Memory c3fb getstk Check Stack Depth c408 reason Check Memory Overlap c435 omerr Output ?OUT OF MEMORY Error c437 error Error Routine c469 errfin Break Entry c474 ready Restart BASIC c480 main Input & Identify BASIC Line c49c main1 Get Line Number & Tokenise Text c4a2 inslin Insert BASIC Text c533 linkprg Rechain Lines c560 inlin Input Line Into Buffer c579 crunch Tokenise Input Buffer c613 fndlin Search for Line Number c642 scrtch Perform [new] c65e clear Perform [clr] c68e stxpt Reset TXTPTR c69c list Perform [list] c717 qplop Handle LIST Character c742 for Perform [for] c7ae newstt BASIC Warm Start c7c4 ckeol Check End of Program c7e1 gone Prepare to execute statement c7ed gone3 Perform BASIC Keyword c81d restor Perform [restore] c82c stop Perform [stop], [end], break c857 cont Perform [cont] c871 run Perform [run] c883 gosub Perform [gosub] c8a0 goto Perform [goto] c8d2 return Perform [return] c8f8 data Perform [data] c906 datan Search for Next Statement / Line c928 if Perform [if] c93b rem Perform [rem] c94b ongoto Perform [on] c96b linget Fetch linnum From BASIC c9a5 let Perform [let] c9c4 putint Assign Integer c9d6 ptflpt Assign Floating Point c9d9 putstr Assign String c9e3 puttim Assign TI$ ca2c getspt Add Digit to FAC#1 ca80 printn Perform [print]# ca86 cmd Perform [cmd] ca9a strdon Print String From Memory caa0 print Perform [print] cab8 varop Output Variable cad7 crdo Output CR/LF cae8 comprt Handle comma, TAB(, SPC( cb1e strout Output String cb3b outspc Output Format Character cb4d doagin Handle Bad Data cb7b get Perform [get] cba5 inputn Perform [input#] cbbf input Perform [input] cbea bufful Read Input Buffer cbf9 qinlin Do Input Prompt cc06 read Perform [read] cc35 rdget General Purpose Read Routine ccfc exint Input Error Messages DATA ;ccfc '?extra ignored' ;cd0c '?redo from start' cd1e next Perform [next] cd61 donext Check Valid Loop cd8a frmnum Confirm Result cd9e frmevl Evaluate Expression in Text ce83 eval Evaluate Single Term cea8 pival Constant - pi DATA cead qdot Continue Expression cef1 parchk Expression in Brackets cef7 chkcls Confirm Character cef7 - -test ')'- cefa - -test '('- cefd - -test comma- cf08 synerr Output ?SYNTAX Error cf0d domin Set up NOT Function cf14 rsvvar Identify Reserved Variable cf28 isvar Search for Variable cf48 tisasc Convert TI to ASCII String cfa7 isfun Identify Function Type cfb1 strfun Evaluate String Function cfd1 numfun Evaluate Numeric Function cfe6 orop Perform [or], [and] d016 dorel Perform <, =, > d01b numrel Numeric Comparison d02e strrel String Comparison d07e dim Perform [dim] d08b ptrget Identify Variable d0e7 ordvar Locate Ordinary Variable d11d notfns Create New Variable d128 notevl Create Variable d194 aryget Allocate Array Pointer Space d1a5 n32768 Constant 32768 in Flpt DATA d1aa facinx FAC#1 to Integer in (AC/YR) d1b2 intidx Evaluate Text for Integer d1bf ayint FAC#1 to Positive Integer d1d1 isary Get Array Parameters d218 fndary Find Array d245 bserr '?bad subscript error' d248 - '?illegal quantity error' d261 notfdd Create Array d30e inlpn2 Locate Element in Array d34c umult Number of Bytes in Subscript d37d fre Perform [fre] d391 givayf Convert Integer in (AC/YR) to Flpt d39e pos Perform [pos] d3a6 errdir Confirm Program Mode d3e1 getfnm Check Syntax of FN d3f4 fndoer Perform [fn] d465 strd Perform [str$] d487 strlit Set Up String d4d5 putnw1 Save String Descriptor d4f4 getspa Allocate Space for String d526 garbag Garbage Collection d5bd dvars Search for Next String d606 grbpas Collect a String d63d cat Concatenate Two Strings d67a movins Store String in High RAM d6a3 frestr Perform String Housekeeping d6db frefac Clean Descriptor Stack d6ec chrd Perform [chr$] d700 leftd Perform [left$] d72c rightd Perform [right$] d737 midd Perform [mid$] d761 pream Pull sTring Parameters d77c len Perform [len] d782 len1 Exit String Mode d78b asc Perform [asc] d79b gtbytc Evaluate Text to 1 Byte in XR d7ad val Perform [val] d7b5 strval Convert ASCII String to Flpt d7eb getnum Get parameters for POKE/WAIT d7f7 getadr Convert FAC#1 to Integer in LINNUM d80d peek Perform [peek] d824 poke Perform [poke] d82d wait Perform [wait] d849 faddh Add 0.5 to FAC#1 d850 fsub Perform Subtraction d862 fadd5 Normalise Addition d867 fadd Perform Addition d947 negfac 2's Complement FAC#1 d97e overr Output ?OVERFLOW Error d983 mulshf Multiply by Zero Byte d9bc fone Table of Flpt Constants DATA d9ea log Perform [log] da28 fmult Perform Multiply da59 mulply Multiply by a Byte da8c conupk Load FAC#2 From Memory dab7 muldiv Test Both Accumulators dad4 mldvex Overflow / Underflow dae2 mul10 Multiply FAC#1 by 10 daf9 tenc Constant 10 in Flpt DATA dafe div10 Divide FAC#1 by 10 db07 fdiv Divide FAC#2 by Flpt at (AC/YR) db0f fdivt Divide FAC#2 by FAC#1 dba2 movfm Load FAC#1 From Memory dbc7 mov2f Store FAC#1 in Memory dbfc movfa Copy FAC#2 into FAC#1 dc0c movaf Copy FAC#1 into FAC#2 dc1b round Round FAC#1 dc2b sign Check Sign of FAC#1 dc39 sgn Perform [sgn] dc58 abs Perform [abs] dc5b fcomp Compare FAC#1 With Memory dc9b qint Convert FAC#1 to Integer dccc int Perform [int] dcf3 fin Convert ASCII String to a Number in FAC#1 ddb3 n0999 String Conversion Constants DATA ddc2 inprt Output 'IN' and Line Number dddd fout Convert FAC#1 to ASCII String de68 foutim Convert TI to String df11 fhalf Table of Constants DATA df71 sqr Perform [sqr] df7b fpwrt Perform power ($) dfb4 negop Negate FAC#1 dfbf logeb2 Table of Constants DATA dfed exp Perform [exp] ; ; VIC-20 Kernel ROM ; ;e000 (exp continues) EXP continued From BASIC ROM e040 polyx Series Evaluation e08a rmulc Constants for RND DATA e094 rnd Perform [rnd] e0f6 bioerr Handle I/O Error in BASIC e109 bchout Output Character e10f bchin Input Character e115 bckout Set Up For Output e11b bckin Set Up For Input e121 bgetin Get One Character e127 sys Perform [sys] e153 savet Perform [save] e162 verfyt Perform [verify / load] e1bb opent Perform [open] e1c4 closet Perform [close] e1d1 slpara Get Parameters For LOAD/SAVE e1fd combyt Get Next One Byte Parameter e203 deflt Check Default Parameters e20b cmmerr Check For Comma e216 ocpara Get Parameters For OPEN/CLOSE e261 cos Perform [cos] e268 sin Perform [sin] e2b1 tan Perform [tan] e2dd pi2 Table of Trig Constants DATA ;e2dd 1.570796327 pi/2 ;e2e2 6.28318531 pi*2 ;e2e7 0.25 ;e2ec #05 (counter) ;e2ed -14.3813907 ;e2f2 42.0077971 ;e2f7 -76.7041703 ;e2fc 81.6052237 ;e301 -41.3417021 ;e306 6.28318531 e30b atn Perform [atn] e33b atncon Table of ATN Constants DATA ;e33b #0b (counter) ;e3ec -0.000684793912 ;e341 0.00485094216 ;e346 -0.161117018 ;e34b 0.034209638 ;e350 -0.0542791328 ;e355 0.0724571965 ;e35a -0.0898023954 ;e35f 0.110932413 ;e364 -0.142839808 ;e369 0.19999912 ;e36e -0.333333316 ;e373 1.00 e378 init BASIC Cold Start e387 initat CHRGET For Zero-page e39f rndsed RND Seed For zero-page DATA ;e39f 0.811635157 e3a4 initcz Initialize BASIC RAM e404 initms Output Power-Up Message e429 words Power-Up Message DATA ;e429 ' bytes free' ;e436 '**** cbm basic v2 ****' e44f bvtrs Table of BASIC Vectors (for 0300) WORD e45b initv Initialize Vectors e467 bassft BASIC Warm Restart [RUNSTOP-RESTORE] e475 ? e47c - Unused Bytes For Future Patches EMPTY e4a0 - Serial Output 1 e4a9 - Serial Output 0 e4b2 - Get Serial Data And Clock In e4bc - Get Secondary Address patch for Serial LOAD/VERIFY e4c1 - Relocated Load patch for Serial LOAD/VERIFY e4cf - Tape Write patch for CLOSE e4da - Unused EMPTY e500 iobase Return I/O Base Address e505 screen Return Screen Organization e50a plot Read / Set Cursor X/Y Position e518 cint1 Initialize I/O e55f - Clear Screen e581 - Home Cursor e587 - Set Screen Pointers e5b5 - Set I/O Defaults (Unused Entry) e5bb - Set I/O Defaults e5cf lp2 Get Character From Keyboard Buffer e5e5 - Input From Keyboard e64f - Input From Screen or Keyboard e6b8 - Quotes Test e6c5 - Set Up Screen Print e6ea - Advance Cursor e719 - Retreat Cursor e72d - Back on to Previous Line e742 - Output to Screen e756 - -unshifted characters- e800 - -shifted characters- e8c3 - Go to Next Line e8d8 - Output e8e8 - Check Line Decrement e8fa - Check Line Increment e912 - Set Colour Code e921 - Colour Code Table DATA e929 ? DATA e975 - Scroll Screen e9ee - Open A Space On The Screen ea56 - Move A Screen Line ea6e - Syncronise Colour Transfer ea7e - Set Start of Line ea8d - Clear Screen Line eaa1 - Print To Screen eab2 - Syncronise Colour Pointer eabf - Main IRQ Entry Point eb1e scnkey Scan Keyboard eb71 - Process Key Image ec46 - Pointers to Keyboard decoding tables WORD ec5e - Keyboard Decoding Table - Unshifted DATA ec9f - Keyboard Decoding Table - Shifted DATA ece0 - Keyboard Decoding Table - Commodore DATA ed21 - Graphics/Text Control ed69 - Keyboard Decoding Table DATA eda3 - Keyboard Decoding Table - Control DATA ede4 - Video Chip Set Up Table DATA edf4 - Shift-Run Equivalent DATA edfd - Low Byte Screen Line Addresses DATA ee14 talk Send TALK Command on Serial Bus ee17 listn Send LISTEN Command on Serial Bus ee49 - Send Data On Serial Bus eeb4 - Flag Errors eeb4 Status #80 - device not present eeb7 Status #03 - write timeout eec0 second Send LISTEN Secondary Address eec5 - Clear ATN eece tksa Send TALK Secondary Address eed3 - Wait For Clock eee4 ciout Send Serial Deferred eef6 untlk Send UNTALK on Serial Bus ef04 unlsn Send UNLISTEN on Serial Bus ef19 acptr Receive From Serial Bus ef84 - Serial Clock On ef8d - Serial Clock Off ef96 - Delay 1 ms efa3 - RS-232 Send efee - Send New RS-232 Byte f016 - 'No DSR' Error f019 - 'No CTS' Error f021 - Disable Timer f027 - Compute Bit Count f036 - RS-232 Receive f05b - Set Up To Receive f068 - Process RS-232 Byte f0bc - Submit to RS-232 f0ed - Send to RS-232 Buffer f116 - Input From RS-232 f14f - Get From RS-232 f160 - Serial Bus Idle f174 - Table of Kernal I/O Messages DATA ;f174 ' i/o error #' ; ... ;f1df 'ok' f1e2 - Print Message if Direct f1e6 - Print Message f1f5 getin Get a byte f20e chrin Input a byte f250 - Get From Tape / Serial / RS-232 f27a chrout Output One Character f2c7 chkin Set Input Device f309 chkout Set Output Devic f34a close Close File f3cf - Find File f3df - Set File values f3ef clall Abort All Files f3f3 clrchn Restore Default I/O f40a open Open File f495 - Send Secondary Address f4c7 - Open RS-232 f542 load Load RAM From Device f549 LOAD -load- f55c - Load File From Serial Bus f5ca - Load File From Tape f647 - Print "SEARCHING" f659 - Print Filename f66a - Print "LOADING / VERIFYING" f675 save Save RAM To Device f685 SAVE -save- f692 - Save to Serial Bus f6f1 - Save to Tape f728 - Print "SAVING" f734 udtim Increment Real-Time Clock f760 rdtim Read Real-Time Clock f767 settim Set Real-Time Clock f770 STOP Check STOP Key ;f77e - Output I/O Error Messages f77e 'too many files' f781 'file open' f784 'file not open' f787 'file not found' f78a 'device not present' f78d 'not input file' f790 'not output file' f793 'missing filename' f796 'illegal device number' f7af - Find Any Tape Header f7e7 - Write Tape Header f84d - Get Buffer Address f854 - Set Buffer Stat / End Pointers f867 - Find Specific Tape Header f88a - Bump Tape Pointer f894 - Print "PRESS PLAY ON TAPE" f8ab - Check Tape Status f8b7 - Print "PRESS RECORD..." f8c0 - Initiate Tape Read f8e3 - Initiate Tape Write f8f4 - Common Tape Code f94b - Check Tape Stop f95d - Set Read Timing f98e - Read Tape Bits faad - Store Tape Characters fbd2 - Reset Tape Pointer fbdb - New Character Setup fbea - Send Tone to Tape fc06 - Write Data to Tape fc95 - Write Tape Leader fccf - Restore Normal IRQ fcf6 - Set IRQ Vector fd08 - Kill Tape Motor fd11 - Check Read / Write Pointer fd1b - Bump Read / Write Pointer fd22 - Power-Up RESET Entry fd3f - Check For A-ROM fd4d - ROM Mask 'a0CBM' DATA fd52 restor Restore Kernal Vectors (at 0314) fd57 vector Change Vectors For User fd6d - Kernal Reset Vectors WORD fd8d ramtas Initialise System Constants fdf1 - IRQ Vectors For Tape I/O WORD fdf9 ioinit Initialise I/O fe39 - Enable Timer fe49 setnam Set Filename fe50 setlfs Set Logical File Parameters fe57 readss Get I/O Status Word fe66 setmsg Control OS Messages fe6f settmo Set IEEE Timeout fe73 memtop Set / Read Top of Memory fe82 membot Set / Read Bottom of Memory fea9 NMI Transfer Entry fed2 Warm Start Basic [BRK] ;fed2 User Vector (default BRK) ff56 Exit Interrupt ff5b RS-232 Timing Table DATA ff72 IRQ Transfer Entry ; ;ff8a Vic-20 Kernel Jump Table ; ff8a jmp $fd52 restor Restore Vectors ff8d jmp $fd57 vector Change Vectors For User ff90 jmp $fe66 setmsg Control OS Messages ff93 jmp $eec0 secnd Send SA After Listen ff96 jmp $eece tksa Send SA After Talk ff99 jmp $fe73 memtop Set/Read System RAM Top ff9c jmp $fe82 membot Set/Read System RAM Bottom ff9f jmp $eb1e scnkey Scan Keyboard ffa2 jmp $fe6f settmo Set Timeout In IEEE ffa5 jmp $ef19 acptr Handshake Serial Byte In ffa8 jmp $eee4 ciout Handshake Serial Byte Out ffab jmp $eef6 untalk Command Serial Bus UNTALK ffae jmp $ef04 unlsn Command Serial Bus UNLISTEN ffb1 jmp $ee17 listn Command Serial Bus LISTEN ffb4 jmp $ee14 talk Command Serial Bus TALK ffb7 jmp $fe57 readss Read I/O Status Word ffba jmp $fe50 setlfs Set Logical File Parameters ffbd jmp $fe49 setnam Set Filename ffc0 jmp ($031a) (iopen) Open Vector [F40A] ffc3 jmp ($031c) (iclose) Close Vector [F34A] ffc6 jmp ($031e) (ichkin) Set Input [F2C7] ffc9 jmp ($0320) (ichkout) Set Output [F309] ffcc jmp ($0322) (iclrch) Restore I/O Vector [F353] ffcf jmp ($0324) (ichrin) Input Vector, chrin [F20E] ffd2 jmp ($0326) (ichrout) Output Vector, chrout [F27A] ffd5 jmp $f542 load Load RAM From Device ffd8 jmp $f675 save Save RAM To Device ffdb jmp $f767 settim Set Real-Time Clock ffde jmp $f760 rdtim Read Real-Time Clock ffe1 jmp ($0328) (istop) Test-Stop Vector [F770] ffe4 jmp ($032a) (igetin) Get From Keyboad [F1F5] ffe7 jmp ($032c) (iclall) Close All Channels And Files [F3EF] ffea jmp $f734 udtim Increment Real-Time Clock ffed jmp $e505 screen Return Screen Organization fff0 jmp $e50a plot Read / Set Cursor X/Y Position fff3 jmp $e500 iobase Return I/O Base Address ;fff6 Unused Vectors fff6 [ffff] fff8 [ffff] ;fffa Transfer Vectors fffa [fea9] NMI fffc [fd22] RESET fffe [ff72] IRQ

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