====== MEMORY MAP ======

^ ADDRESS RANGE ^ MMU BLOCK NUMBERS ^ USES ^
| 00000 - 5FFFF | 00-2F | 128K CoCo3: 3 Mirrors of MMU Blocks 30-37 | 
| | | 512K+ CoCo 3: Additional 384K  |
| 60000 - 61FFF | 30 | CoCo 3 Super Extended BASIC High Resolution Graphics Page 1 |
| 62000 - 63FFF | 31 | CoCo 3 Super Extended BASIC High Resolution Graphics Page 2 |
| 64000 - 65FFF | 32 | CoCo 3 Super Extended BASIC High Resolution Graphics Page 3 |
| 66000 - 67FFF | 33 | CoCo 3 Super Extended BASIC High Resolution Graphics Page 4 |
| 68000 - 69FFF | 34 | CoCo 3 Super Extended BASIC HGET/HPUT buffers |
| 6A000 - 6BFFF | 35 | CoCo 3 Second Stack area |
| 6C000 - 6DFFF | 36 | CoCo 3 [[High Resolution Text Screen]] |
| 6E000 - 6FFFF | 37 | CoCo 3 Unused area |
| 70000 - 71FFF | 38 | First 8K of MPU workspace / [[BASIC]] [[RAM]] :: [[PCLEAR 0]]|
| _0000 - _03FF | | BASIC direct page variables |
| _0019 - 001A | | TXTTAB Beginning of BASIC program |
| _001B - 001C | | VARTAB Start of Variables |
| _001D - 001E | | ARYTAB Start of Arrays |
| _001F - 0020 | | ARYEND End of Arrays +1 |
| _0021 - 0022 | | FRETOP Start of String storage (top of free RAM) |
| _0023 - 0024 | | STRTAB Start of String Variables |
| _0025 - 0026 | | FRESPC Utility String Pointer|
| _0027 - 0028 | | MEMSIZ Top of String Space |
| _0400 - _05FF | | VDG default text screen buffer |
| _0600 - _0DFF | | Disk Extended Color BASIC buffers |
| _0E00 - _1FFF | | BASIC program space or Semigraphics / PMODE graphics buffers |
| 72000 - 73FFF | 39 | BASIC program space or Semigraphics / PMODE graphics buffers |
| 74000 - 75FFF | 3A | BASIC program space |
| 76000 - 77FFF | 3B | BASIC program space |
| 78000 - 79FFF | 3C | [[Extended Color BASIC]] ROM or mappable RAM |
| _8378 | | [[COS]] Return cosine of an angle given in radians |
| _8381 | | [[TAN]] Returns tangent of angle given in radians |
| _83B0 | | [[ATN]] Returns arctangent in radians |
| _8446 | | [[LOG]] Returns natural logarithm |
| _8480 | | [[SQR]] Returns the square root of a number |
| _84F2 | | [[EXP]] Returns natural exponential of number |
| _8524 | | [[FIX]] Returns truncated (whole number) value |
| _8533 | | [[EDIT]] Allows editing of program line |
| _86A7 | | [[TRON]] Turns on program tracer |
| _86A8 | | [[TROFF]] Turns off program tracer |
| _86AC | | [[POS]] Returns current print position |
| _86BE | | [[VARPTR]] Returns address of pointer to the specified variable |
| _874E | | [[STRING]] Returns a string of characters of specified length |
| _877E | | [[INSTR]] Searches for the first occurrence of target string |
| _8871 | | [[DEF]] Defines numeric function |
| _8968 | | [[TIMER]] Returns contents or allows setting of timer |
| _8970 | | [[DEL]] Deletes program lines |
| _8A09 | | [[RENUM]] Allows program line renumbering |
| _8BDD | | [[HEX$]] Computes hexadecimal value |
| _8C18 | | [[DLOAD]] Loads BASIC program at specified baud |
| _9339 | | [[PPOINT]] Tests whether specified graphics cell is on or off |
| _9361 | | [[PSET]] Sets a specified point (x,y) to specified color c |
| _9365 | | [[PRESET]] Reset a point to background color |
| _93BB | | [[LINE]] Draw a line from (x1,y1) to (x2,y2) |
| _9532 | | [[PCLS]] Clears screen with specified color c |
| _9546 | | [[COLOR]] Sets foreground and background color |
| _9621 | | [[PMODE]] Selections resolution and first memory page |
| _9670 | | [[SCREEN]] Selects either graphics (1) or text (0) screen and color-set (0 or 1) |
| _968B | | [[PCLEAR]] Reserves b number of 1.5K graphics memory pages |
| _9723 | | [[PCOPY]] Copy graphics from source page to destination page |
| _9755 | | [[GET]] Reads the graphic contents of a rectangle into an array for future use by PUT |
| _9758 | | [[PUT]] Stores graphics from source into start/end rectangle on the screen |
| _98EC | | [[PAINT]] Paints graphic screen starting at a point (x,y) withh specified color c stopping at border b |
| _9A22 | | [[PLAY]] Plays music of specific note, octave, note-length, tempo, pause |
| _9CB6 | | [[DRAW]] Draws a line beginning at specified starting point of specified length and color |
| _9E9D | | [[CIRCLE]] Draws a circle with center at point (x,y) radius r, specified color c and height/width ratio |
| 7A000 - 7BFFF | 3D | [[Color BASIC]] [[ROM]] or mappable RAM |
| _A027 | | [[RESVEC]] Reset vector - system starts here |
| _A074 | | [[BACDST]] BASIC Cold Start |
| _A0E8 | | [[BAWMST]] BASIC Warm Start |
| _A0F6 | | [[BFRQSV]] Fast Interrupt (FIRQ) service handler - "fast" interrupts jump here |
| _A153 | | Color BASIC version $31, $2E, then $30 = 1.0, $31 = 1.1, $32 = 1.2, $33 = 1.3 |
| _A176 | | Console In |
| _A1B1 | | Blink Cursor |
| _A1CB | | [[KEYIN]] Get a keystroke |
| _A182 | | [[PUTCHR]] Console Out |
| _A416 | | [[CLOSE]] Close files |
| _A44C | | [[CSAVE]] Cassette save |
| _A498 | | [[CLOAD]] Cassette load |
| _A53E | | [[EXEC]] EXECute code at address |
| _A564 | | [[INKEY$]] Get a key |
| _A5CE | | [[EOF]] End of file |
| _A5EC | | [[SKIPF]] Skip tape file |
| _A5F6 | | [[OPEN]] Open a file |
| _A7BD | | [[MOTOR]] Tape drive motor control |
| _A880 | | [[SET]] Draw a semigraphics pixel |
| _A8B1 | | [[RESET]] Clear a semigraphics pixel |
| _A8F5 | | [[POINT]] Check color of a semigraphics pixel |
| _A910 | | [[CLS]] Clear screen |
| _A94B | | [[SOUND]] Beep the speaker |
| _A990 | | [[AUDIO]] Control the audio source |
| _A9B3 | | [[BIRQSV]] Interrupt service handler |
| _A9C6 | | [[JOYSTK]] Read and report joysticks |
| _AD17 | | [[NEW]] Initialize the BASIC memory map |
| _AD47 | | [[FOR]] Start a loop |
| _ADE4 | | [[RESTORE]] Start back at the first DATA item |
| _AE02 | | [[END]] The end of the program |
| _AE09 | | [[STOP]] Stop the program at the current line |
| _AE30 | | [[CONT]] Continue the program from a stop |
| _AE41 | | [[CLEAR]] Clear RAM for string space |
| _AE75 | | [[RUN]] Start the program running |
| _AE86 | | [[GO]] Jump to line number |
| _AEC0 | | [[RETURN]] Return from a subroutine |
| _AEE0 | | [[DATA]] Store data within a program |
| _AEE3 | | [[REM]] [[']] Comments or remarks - FIXME Else uses this too? |
| _AF14 | | [[IF]] Start a conditional check |
| _AF42 | | [[ON]] Start of multi-way branch |
| _AF89 | | [[LET]] Assign a variable |
| _AFF5 | | [[INPUT]] Read a line of text at a time |
| _B046 | | [[READ]] Read a piece of data |
| _B0F8 | | [[NEXT]] End of a loop |
| _B141 | | [[EVAL]] Evaluate a numeric expression |
| _B227 | | [[EXP]] Generates ?SN in Color BASIC, implemented in Extended Color BASIC |
| _B2D4 | | [[OR]] Boolean / Logical OR operator |
| _B2D5 | | [[AND]] Boolean / Logical AND operator |
| _B34E | | [[DIM]] Set aside memory for arrays |
| _B44A | | [[USR]] User defined function |
| _B4EE | | [[MEM]] Free memory |
| _B4FD | | [[STR$]] Convert a number to a string |
| _B681 | | [[LEN]] Length of a string |
| _B68C | | [[CHR$]] Convert number to Control, ASCII, or graphics code string |
| _B6A0 | | [[ASC]] ASCII code of first letter of string |
| _B6AB | | [[LEFT$]] Left part of a string |
| _B6C8 | | [[RIGHT$]] Right part of a string |
| _B6CF | | [[MID$]] Middle of a string |
| _B716 | | [[VAL]] Convert a string to a number |
| _B750 | | [[PEEK]] Read a value from a memory address |
| _B757 | | [[POKE]] Write a value to a memory address |
| _B75E | | [[LLIST]] List program to printer |
| _B764 | | [[LIST]] List program to screen |
| _B8F7 | | [[PRINT]] Write to the screen |
| _BC7A | | [[SGN]] Get the sign of a number positive or negative |
| _BC93 | | [[ABS]] Get absolute value of a signed number |
| _BCEC | | [[INT]] Convert a number to an integer |
| _BF1F | | [[RND]] Pseudo-random number generator |
| _BF78 | | [[SIN]] Sine of an angle |
| _BFF0 | | Vector copy Search for cassette file A681 |
| _BFF2 | | Vector copy 0100 SW3VEC - |
| _BFF4 | | Vector copy 0103 SW2VEC - |
| _BFF6 | | Vector copy 010F FRQVEC A0F6 |
| _BFF8 | | Vector copy 010C IRQVEC A9B3 |
| _BFFA | | Vector copy 0106 SWIVEC - |
| _BFFC | | Vector copy 0109 NMIVEC - |
| _BFFE | | Vector copy A027 RESVEC - |
| 7C000 - 7DFFF | 3E | [[Disk Extended Color BASIC]] ROM or 8K Cartridge ROM or 16K Cartridge lower 8K bank or Mappable RAM |
| _C6EF | | [[KILL]] Deletes the filename you specify from the disk directory |
| _C9E0 | | [[SAVE]] Saves filename on disk |
| _CA39 | | [[MERGE]] Loads the specified program file from disk and merges it with the program that exists in memory |
| _CA48 | | [[LOAD]] Loads the specified program file into memory from disk |
| _CCA9 | | [[DIR]] Displays a directory of the disk in the drive you specify |
| _CDF4 | | [[CVN]] Convert a 5-byte coded string created by MKN$ back to the number it represents |
| _CE02 | | [[MKN$]] Convert a specified number into a 5-byte coded string for storage in a formatted disk file |
| _CE10 | | [[LOC]] Returns the current record number of the buffer you specify |
| _CE37 | | [[LOF]] Returns the highest-numbered record of the buffer you specify |
| _CE9C | | [[FREE]] Returns to the number of free granules on the disk in the drive you specify |
| _CEC5 | | [[DRIVE]] Changes the default drive to the drive you specify |
| _D01B | | [[RENAME]] Renames a disk file |
| _D066 | | [[WRITE]] Writes the data to the buffer you specify |
| _D0BC | | [[FIELD]] Organizes the space within a direct access buffer into fields |
| _D101 | | [[RSET]] Right-justifies the data within the field you specify |
| _D102 | | [[LSET]] Left-justifies the data within the field you specify |
| _D15C | | [[FILES]] Tell the computer the number of buffers to reserve in memory |
| _D233 | | [[UNLOAD]] Close any open files on the disk in the drive you specify |
| _D262 | | [[BACKUP]] Duplicates the contents of the disk in the source drive on the disk in the destination drive |
| _D3B9 | | [[COPY]] Copies the contents of filename1 to filename2 |
| _D4ED | | [[DSKI$]] Inputs data from a particular sector with in a particular track on the disk in the drive you specify |
| _D562 | | [[DSKO$]] Writes string data on sector, track, and drive number you specify |
| _D599 | | [[DSKINI]] Formats a disk in the drive you specify |
| _D6EC | | [[DOS]] With the OS-9 system diskette in drive 0, the DOS command boots the OS-9 operating system |
| _D74E | | [[VERIFY]] Turns the verify function on or off |
| 7E000 - 7FDFF | 3F | [[Super Extended BASIC]] ROM or 16K Cartridge upper 8K bank or Mappable RAM |
| _E3D4 | | [[ERR]] Jumps to line number when an error occurs |
| _E3E6 | | [[BRK]] Jumps to line number when the [BREAK] key is pressed |
| _E4E9 | | [[ERNO]] Return the BASIC error number for the error that has occurred |
| _E4FD | | [[ERLIN]] Returns the BASIC line number where an error has occurred |
| _E545 | | [[LPOKE]] Stores a value (0-255) in a virtual memory location (0-524287 decimal or 0-$7FFFF hexadecimal) |
| _E573 | | [[LPEEK]] Returns a value (0-255) in a virtual memory location (0-524287 decimal or 0-$7FFFF hexadecimal) |
| _E5B1 | | [[BUTTON]] Returns 1 if Joystick Button n is being pressed |
| _E5F0 | | [[PALETTE]] Resets the palette registers to the standard colors for a composite monitor or a television set or for an RGB monitor |
| _E674 | | [[PALETTE|RGB]] Resets the palette registers to the standard colors for an RGB monitor|
| _E676 | | [[PALETTE|CMP]] Resets the palette registers to the standard colors for a composite monitor or a television set |
| _E688 | | [[HSCREEN]] Selects a high-resolution graphics screen mode |
| _E6CF | | [[HCLS]] Clears the high-resolution graphics screen to a specified color |
| _E6F4 | | [[HCOLOR]] Sets foreground and background color on the high-resolution graphics screen |
| _E761 | | [[HSET]] Sets point x,y on the high-resolution graphics screen to color c. |
| _E765 | | [[HRESET]] Resets a point on the high-resolution graphics screen to the background color |
| _E85C | | [[HPOINT]] Returns information on point x,y from the high-resolution graphics screen |
| _E882 | | [[HLINE]] Draws a line on the high-resolution graphics screen |
| _EA49 | | [[HCIRCLE]] Draws a circle on the high-resolution graphics screen |
| _EBF5 | | [[HPAINT]] Paints an area on the high-resolution graphics screen |
| _ED58 | | [[HBUFF]] Reserves an area in memory for high-resolution graphics |
| _EDE5 | | [[HGET]] Stores a rectangle that is on the high-resolution graphics screen into a buffer previously set up by the [[HBUFF]] command for future use by the [[HPUT]] command |
| _EDED | | [[HPUT]] Copies graphics from a buffer to a rectangle on the high-resolution graphics screen |
| _EF3F | | [[HPRINT]] Prints message on high-resolution graphics screen |
| _F39D | | [[HDRAW]] Draws a line on the high-resolution graphics screen as specified by string |
| _F636 | | [[WIDTH]] Sets the text screen to resolution n |
| _F8D2 | | [[LOCATE]] Moves the hhigh-resolution text screen cursor to position x, y |
| _F925 | | [[HSTAT]] Returns information regarding the high-resolution text screen cursor to variables v1, v2, v2, and v4 |
| _F9B9 | | [[ATTR]] Sets display attributes of a high-resolution text screen |
| _FD00 - _FD81 | | Boomerang RAM controls |
| 7FE00 - 7FEFF | 3F | CoCo 3 Additional Vectors |
| 7FF00 - 7FFFF | 3F | Memory Mapped Hardware I/O Range |
| _FF00 - _FF03 | | [[Peripheral Interface Adapter 0]] (PIA0) [[MC6821]] / [[MC6822]] / [[LSC81001P]] |
| | | [[Keyboard]] :: Scan keyboard and Joystick Buttons [[keyscn]] [[keyscn2]] |
| | | [[Joystick]] Comparator |
| | | [[HSYNC]] [[Interrupt]] control and flag |
| | | [[VSYNC]] [[Interrupt]] control and flag |
| | | Audio [[Multiplexer]] Control / Joystick Select |
| _FF04 - _FF1F | | Addressing mirrors of FF00 - FF03 |
| _FF20 - _FF23 | | [[Peripheral Interface Adapter 1]] (PIA1) [[MC6821]] / [[MC68B21P]] / [[MB8874HM-G]] / [[HD68B21P]] |
| | | [[Cassette]] Data Input |
| | | Cassette Motor Control |
| | | [[RS232]] Data Input / Output :: [[Serial Printers]] :: [[Modems]] :: [[DLOAD]] :: [[Digitizer]] :: [[Drivewire]] :: [[BBS]] :: [[Rainboard]] |
| | | RS232C CD FIRQ [[Interrupt]] control and flag |
| | | DAC :: [[Six Bit Sound]] |
| | | [[One Bit Sound]] Output |
| | | RAM Size Input |
| | | [[MC6847]] [[MC6847T1]] [[VDG]] Color Set Select (CSS) |
| | | VDG Graphics Mode 0-2 (GM0-GM2) |
| | | VDG Alpha/Graphics (A/G) |
| | | Cartridge FIRQ [[Interrupt]] control and flag |
| | | Sound Enable control |
| _FF24 - _FF3F | | Addressing mirrors of FF20 - FF23 |
| _FF40 - _FF4B | | [[Floppy Disk Controller]] ([[FDC]]) :: [[WD1793]] :: [[DSKREG]] |
| _FF40 - _FF4B | | [[CoCoSDC]] |
| _FF40 - _FF4F | | [[CoCoNIC]] [[CS8900A]] Network Adapter |
| _FF40 - _FF41 | | [[Game Master Cartridge]] (GMC) by John Linville with TI DCSG ([[SN76489AN]]) |
| _FF42 - _FF42 | | [[Becker Port]] :: Gary Becker's I/O port for emulators and FPGA designs |
| _FF50 - _FF54 | | [[MEGA Mini Multi-Pak Interface]] (MMMPI) [[YMF-262]] control |
| _FF5A - _FF5F | | [[CoCoPSG]] by Ed "Zippster" Snider's with Yamaha SSG ([[YM2149]]) |
| _FF60 - _FF62 | | X-Pad |
| _FF60 - _FF63 | | [[Philharmonic-12]] by Jim Brain with [[MC6821]] [[PIA]] interface to 4 x GI PSG ([[AY-3-8910]]) |
| _FF60 - _FF6B | | [[CoCoIO]] Serial [[SC16550]] and [[WizNet 9100s]] Ethernet Interface |
| _FF68 - _FF6B | | [[Deluxe RS-232 Pak]] (26-2226) |
| _FF6C - _FF6F | | [[Direct Connect Modem Pak]] (26-2228) |
| _FF6E - _FF6F | | [[MIDI Maestro]] by Jim Brain with [[MC6850]] ACIA interface |
| _FF70 - _FF72 | | [[Stereo Composer]] |
| _FF7A - _FF7B | | [[Orchestra 90]]/CC Cartridge (26-3143) |
| _FF7D - _FF7E | | [[Speech Sound Cartridge]] (SSC) (26-3144A) |
| _FF7F | | [[Multi-Pak Interface]] (MPI) (26-3024, 26-3124, 26-3124A) Slot Select |
| _FF90 - _FF9F | | ACVC / [[GIME]] Control |
| _FFA0 - _FFAF | | ACVC / GIME [[MMU]] |
| _FFB0 - _FFBF | | ACVC / GIME Palette |
| _FFC0 - _FFDF | | ACVC / GIME / [[SAM]] |
| _FFE0 - _FFEF | | Reserved |
| _FFF0 - _FFFF | | 6809 [[MPU]] Vectors |
| _FFF0 - _FFF1 | | Vector - 6809: Reserved 6309: Error Trap |
| _FFF2 - _FFF3 | | Vector - Software [[Interrupt]] 3 (SWI3) |
| _FFF4 - _FFF5 | | Vector - Software [[Interrupt]] 2 (SWI2) |
| _FFF6 - _FFF7 | | Vector - Fast [[Interrupt]] Request (/[[FIRQ]]) |
| _FFF8 - _FFF9 | | Vector - [[Interrupt]] Request (/[[IRQ]]) |
| _FFFA - _FFFB | | Vector - Software [[Interrupt]] ([[SWI]]) |
| _FFFC - _FFFD | | Vector - Non-Maskable [[Interrupt]] (/[[NMI]]) |
| _FFFE - _FFFF | | Vector - /[[RESET]] |

===== RTS =====
Return to [[:Tandy Color Computer:]]