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; Commodore 1541 / OC-118 Disk Drive ROM Map ; V1.0 1 Sep 1994 ; Note: This Memory map is collected from the 1541 diassembly ; which was made by Peter Weighill. I cannot guarantee accuracy ; of all details. ; ; 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 AA's or FF's ; c000 Unused EMPTY ;c100 File Manager Routines c100 Turn LED on c118 Turn LED on c123 Clear error flags c12c Prepare for LED flash after error c146 Interpret command from computer c194 Prepare error msg after executing command c1bd Erase input buffer c1c8 Output error msg (track and sector 0) c1d1 Check input line c1e5 Check input line c1ee Check input line c268 Search character in input buffer c2b3 Check line length ptr in command c2dc Clear flags for command input c312 Preserve drive number c33c Search for drive number c368 Get drive number c38f Reverse drive number c398 ? c3bd Check drive number c3ca Verify drive number c440 Flags for drive check DATA c44f Search for file in directory c63d Test and initalise drive c66e Name of file in directory buffer c688 ? c6a6 Search for end of name in command c6ce ? c6de ? c7ac Clear Directory Output Buffer c7b7 Create header with disk nmae c806 Print 'blocks free.' c817 'Blocks free.' DATA c823 Perform [S] - Scratch command c87d Erase file c8b6 Erase dir entry c8c1 Perform [D] - Backup command (Unused) c8c6 Format disk c8f0 Perform [C] - Copy command ca88 Perform [R] - Rename command cacc Check if file present caf8 Perform [M] - Memory command cb20 M-R memory read cb50 M-W momory write cb5c Perform [U] - User command cb84 Open direct access channel, number cc1b Perform [B] - Block/Buffer command cc5d Block commands "AFRWEP" DATA cc63 Block command vectors WORD cc6f Get parameters form block commands ccf2 Decimal values 1, 10, 100 DATA ccf5 B-F block free ccfe ? cd03 B-A block allocate cd36 ? cd3c Get byte from buffer cd42 Read block from disk cd56 B-R block read cd5f U1, Block read without changing buffer pointer cd73 B-W block write cd97 U2, Block read without changing buffer pointer cda3 B-E block execute cdbd B-P block pointer cdd2 Open channel cdf2 Check buffer number and open channel ce0e Set pointer for REL file cd2c ? cd6e Divide by 254 ce71 Divide by 120 cdd9 Erase work storage dee2 Left shift 3-byte register twice cee5 Left shift 3-byte register once ceed ? cefa ? cf09 ? cf1e ? cf8c Change buffer cf9b Write data in buffer cff1 Write data byte in buffer d005 Perform [I] - Initalise command d00e ? d042 Load BAM d075 Calculate blocks free d09b ? d0c3 Read block d0c7 Write block d0eb Open channel for reading d107 Open channel for writing d125 Check for file type REL d12f Get buffer and channel numbers d137 Get a byte from buffer d156 Get byte and read next block d19d Write byte in buffer and block d1c6 Increment buffer pointer d1d3 Get drive number d1df Find write channel and buffer d1e2 Find read channel and buffer d227 Close channel d25a Free buffer d28e Find buffer d307 Close all channels d313 Close all channels of other drives d339 ? d37f Find channel and allocate d39b Get byte for output d44d Read next block d460 Read block d464 Write block d475 Allocate buffer and read block d486 Allocate new block d48d Write dir block d4c8 Set buffer pointer d4da Close internal channel d4e8 Set buffer pointer d4f6 Get byte from buffer d506 Check track and sector numbers d552 Get track and sector numbers for current job d55f Check for vaild track and sector numbers d572 DOS mismatch error d586 Read block d58a Write block d599 Verify execution d5c6 Additional attempts for read errors d676 Move head by half a track d693 Move head one track in or out d6a6 Attempt command execution multiple times d6d0 Transmit param to disk controller d6e4 Enter file in dir d7b4 OPEN command, secondary addr not 15 d8f5 Open a file with overwriting d9a0 Open file for reading d9e3 Open file for writing da09 Check file type and control mode da2a Preparation for append da55 Open directory dac0 Close routine db02 Close file db62 Write last block dba5 Directory entry dc46 Read block, allocate buffer dcb6 Reset pointer dcda Construct a new block dd8d Write byte in side-sector block dd95 Manipulate flags ddab Verify command code for writing ddb7 ? ddf1 Write a block of a REL file ddfd Write bytes for following track de0c Get following track and sector numbers de19 Following track for last block de2b buffer pointer to zero de3b Get track and sector de50 Write (?) de57 R de5e W de65 R de6c W de73 R de95 Get following track and sector from buffer dea5 Copy buffer contents dec1 Erase buffer Y ded2 Get side-sector number dedc Set buffer pointer to side-sector dee9 Buffer pointer for side-sector def8 Get side sector and buffer pointer df1b Read side-sector df21 Write side-sector df45 Set buffer pointer in side-sector df4c Calculate number of blocks in a REL file df66 Verify side-sector in buffer df93 Get buffer number dfd0 Get next record iin REL file e03c Write block and read next block e07c Write a byte in a record e0ab Write byte in REL file e0f3 Fill record with 0s e105 Write buffer number in table e120 Get byte from REL file e1cb Get last side-sector e207 Perform [P] - Position command e2e2 Divide data blocks into records e304 Set pointer to next record e31c Expand side-sector e44e Write side-sector and allocate new e4fc Table of error messages DATA ; Format: error numbers ; description ; (with start and end letters +$80) If value AND $7F less ; than $10 then look up text in pointer table. ; ;e4fc Ok ;e500 Read error ;e50b File too large ;e517 Record not present ;e522 Overflow in record ;e52f Write error ;e533 Write protect on ;d540 Disk id mismatch ;e546 Syntax error ;e552 Write file open ;e556 File exists ;e55f File type mismatch ;e567 No block ;e570 Illegal track or sector ;e589 File not open ;e58d File not found ;e592 Files scratched ;e59f No channel ;e5aa Dir error ;e5af Disk full ;e5b6 Cbm dos v2.6 1541 ;e5c8 Drive not ready e5d5 Indexed words DATA ; Format: index number ; description e60a Prepare error number and message e645 Print error message into error buffer e680 TALK e688 LISTEN e69b Convert BIN to 2-Ascii (error message buffer) e6ab Convert BCD to 2-Ascii (error message buffer) e6bc Write OK in buffer e6c1 Print error on track 00,00 to error buffer e6c7 Print error on current track to error buffer e706 Write error message string to buffer e754 Get character and in buffer e767 Get a char of the error message e775 Increment pointer e77f ? e780 Check for auto start removed e7a3 Perform [&] - USR file execute command e84b Generate checksum e853 IRQ routine for serial bus e85b Service the serial bus e909 Send data e99c DATA OUT lo e9a5 DATA OUT hi e9ae CLOCK OUT hi e9b7 CLOCK OUT lo e9c0 Read IEEE port e9c9 Get data byte from bus e9f2 Accept byte with EOI ea2e Accept data from serial bus ea59 Test for ATN ea6e Flash LED for hardware defects, self-test eaa0 Power-up RESET routine ebff Wait loop ec9e Load dir ed23 ? ed59 Transmit dir line ed67 Get byte from buffer ed84 Perform [V] - Validate command edb3 ? ede5 Allocate file blocks in BAM ee0d Perform [N] - New (Format) command eeb7 Create BAM eef4 Write BAM if needed ef3a Set buffer pointer for BAM ef4d Get number of free blocks for dir ef5c Mark block as free ef88 Set flag for BAM changed ef90 Mark block as allocated efcf Erase bit for sector in BAM entry efe9 Powers of 2 DATA eff1 Write BAM after change f005 Erase BAM buffer f011 ? f05b ? f0df ? f10f Get buffer number for BAM f119 Buffer number for BAM f11e Find and allocate free block f1a9 Find free sector and allocate f1fa Find free sectors in current track f220 Verify number of free blocks in BAM f24b Establish number of sectors per track f258 Dummy subroutine ; ;f259 Disk Controller Routines ; f259 Initialise disk controller f2b0 IRQ routine for disk controller f2f9 Head transport f36e Execute program in buffer f37c Bump, find track 1 (head at stop) f393 Initialise pointer in buffer f3b1 Read block header, verify ID f410 Preserve block header f418 Work Return value 01 (OK) into queue f41b Work Return value 0B (READ ERROR) into queue f41e Work Return value 09 (READ ERROR) into queue f423 Job optimisation f4ca Test command code further f4d1 Read sector f50a Find start of data block f510 Read block header f556 Wait for SYNC f56e Test command code further f575 Write data block to disk f5e9 Calculate parity for data buffer f5f2 Convert buffer of GCR data into binary f691 Test command code further f698 Compare written data with data on disk f6ca Command code for find sector f6d0 Convert 4 binary bytes to 5 GCR bytes f77f GCR (5-bit) nybble table DATA f78f Convert 260 bytes to 325 bytes group code f7e6 Convert 5 GCR bytes to 4 binary bytes f8a0 Conversion table GCR to binary - high nybble ; $FF means invalid f8c0 Conversion table GCR to binary - low nybble ; $FF means invalid f8e0 Decode 69 GCR bytes f934 Convert block header to GCR code f969 Error entry disk controller f97e Turn drive motor on f98f Turn drive motor off f99c Job loop disk controller f9cb ? f9d9 ? fa05 Move head to next track fa1c Calculate number of head steps fa3b Move stepper motor short distance fa4e Load head fa63 ? fa7b Prepare fast head movement fa97 Fast head movement faa5 Prepare slow head movement fac7 Formatting fda3 Write SYNC 10240 times, erase track fdc3 Read/write ($621/$622) times fdd3 Attempt counter for formatting fde5 ? fdf5 Copy data from overflow buffer fe00 Switch to reading fe0e Write $55 10240 times fe30 Convert header in buffer 0 to GCR code fe67 Interrupt routine fe85 Constands for disk format fe85 Directory track DATA fe86 Start of bam DATA fe87 Length of bam per track DATA fe88 End of bam DATA fe89 Table of command words DATA ; "VIDMBUP&CRSN" ; Validate, Initialise, D(Backup unused), ; Memory, Block, User, ; Position, ∧USR execute, Copy, ; Rename, Scratch, New (Format). fe95 Low byte of command addresses DATA fea1 High byte of command addresses DATA fead Bytes for syntax check DATA feb2 File control methods "RWAM" DATA feb6 File types "DSPUL" DATA febb Names of file types DATA febb 1st letter "DSPUR" DATA fec0 2nd letter "EERSE" DATA fec5 3rd letter "LQGRL" DATA feca Error LED bit value DATA fecd Masks for bit command DATA fed1 Number of sectors per track DATA fed5 Constands for disk format DATA fed5 'A' marker for 1541 format DATA fed6 4 track ranges DATA fed7 Number of tracks DATA fed8 Tracks on which sector numbers change DATA fedb Control bytes for head postion DATA fee0 Buffer address high bytes DATA fee6 ROM checksum DATA fee7 From UI command $EB22, to reset ; Without RAM/ROM test feea Patch for diagnostic routine from $EA7A fef3 Delay loop for serial bus in 1541 mode, from $E97D fefb Patch for data output to serial bus, from $E980 ff01 U9 vector, switch 1540/1541 ff10 Patch for reset routine, from $EAA4 ff20 Patch for listen to serial bus, from $E9DC ff2f Unused EMPTY ffe6 Format [C8C6] ffe8 Turn motor off [F98F] ffea USER vectors ffea UA, U1 [CD5F] ffec UB, U2 [CD97] ffee UC, U3 [0500] fff0 UD, U4 [0503] fff2 UE, U5 [0506] fff4 UF, U6 [0509] fff6 UG, U7 [050C] fff8 UH, U8 [050F] fffa UI, U9 [FF01] fffc Hardware vectors fffc RESET [EAA0] fffe IRQ [FE67]