===== MEMORY =====
Color Computers 1 and 2 shipped with 4, 16, 32, or 64KB of [[RAM]] depending on options and board. \\

The Color Computers 1 and 2 were equipped with a Synchronous Address Multiplexer ([[SAM]] MC6883) to manage memory configuration and refresh. \\

Color Computer 3 shipped with 128 or 512KB of [[RAM]] depending on options chosen. \\

The Color Computer 3 custom GIME chip included emulation for the previous generation's [[SAM]] chip as well as provided a new Memory Management Unit [[MMU]] for working with memory larger than 64KB.

===== RAM =====
Random Access Memory

===== EXPANDED MEMORY MAP =====

^COCO3 ADDRESS ^ COCO3 BLOCK ^ COCO MEMORY ADDRESS ^ NOTES ^
| 00000 - 5FFFF | 00 - 2F | [[RAM]] | [[512K Upgrade]] [[RAM]] - unused by [[BASIC]] |
| 60000 - 61FFF | 30 | [[RAM]] | [[High Resolution Page 1]] |
| 62000 - 63FFF | 31 | [[RAM]] | [[High Resolution Page 2]] |
| 64000 - 65FFF | 32 | [[RAM]] | [[High Resolution Page 3]] |
| 66000 - 67FFF | 33 | [[RAM]] | [[High Resolution Page 4]] |
| 68000 - 69FFF | 34 | [[RAM]] | [[HGET]]/[[HPUT]] [[Buffer]] |
| 6A000 - 6BFFF | 35 | [[RAM]] | [[Secondary Stack]] |
| 6C000 - 6DFFF | 36 | [[RAM]] | [[High Resolution Text Screen]] [[RAM]] |
| 6E000 - 6FFFF | 37 | [[RAM]] | Unused by [[BASIC]] |
| 70000 - 71FFF | 38 | 0000 - 1FFF | [[BASIC]] [[RAM]] 8K - 0400 - 05FF 32x16 [[Text Screen]] [[RAM]] |
| 72000 - 73FFF | 39 | 2000 - 3FFF | [[BASIC]] [[RAM]] 16K |
| 74000 - 75FFF | 3A | 4000 - 5FFF | [[BASIC]] [[RAM]] 24K |
| 76000 - 77FFF | 3B | 6000 - 7FFF | [[BASIC]] [[RAM]] 32K |
| 78000 - 79FFF | 3C | 8000 - 9FFF | [[Extended Color BASIC]] ROM (1.0 - 1.1) |
| 7A000 - 7BFFF | 3D | A000 - BFFF | [[Color BASIC]] ROM (1.0 - 1.3)  :: [[polcat.asm]] :: [[joystk.asm]] :: [[newcls]] |
| 7C000 - 7DFFF | 3E | C000 - DFFF | [[Disk BASIC]] ROM (1.0 - 1.1) :: [[https://cocosdc.blogspot.com/|CoCoSDC]] :: [[Cartridge]] ROM Paks |
| 7E000 - 7FFFF | 3F | E000 - FEFF | [[Super Extended Color BASIC]] ROM and [[Easter Egg]] bitmap |
| 7E000 - 7FFFF | 3F | FF00 - FF03 | [[MC6821]] / [[MC6822]] [[PIA0]] [[Keyboard]] [[IRQ]] [[Joystick]] interface :: [[keyscn]] |
| 7E000 - 7FFFF | 3F | FF20 - FF23 | [[MC6821]] / [[MC6822]] [[PIA1]] [[Cassette]], [[RS-232]], [[IRQ]], [[DAC]], [[MC6847]] [[MC6847T1]] [[VDG]], [[Sound Generator]], [[Drivewire]] |
| 7E000 - 7FFFF | 3F | FF40 | [[DSKREG]] Disk Output Latch |
| 7E000 - 7FFFF | 3F | FF41 | [[Games Master Cart]] [[SN76489AN]] |
| 7E000 - 7FFFF | 3F | FF42 - FF43 | [[Becker Port]] | 
| 7E000 - 7FFFF | 3F | FF48 - FF4B | [[WD1793]] [[FDC]] Registers Status, Track, Sector, Data |
| 7E000 - 7FFFF | 3F | FF60 - FF62 | TRS-80 [[Digitizer]] (26-1195) |
| 7E000 - 7FFFF | 3F | FF68 - FF6B | [[Deluxe RS-232 Pak]] (26-2226) |
| 7E000 - 7FFFF | 3F | FF6C - FF6F | [[Direct Connect Modem Pak]] (26-2228) |
| 7E000 - 7FFFF | 3F | FF7A - FF7B | [[Orchestra 90]]/CC Cartridge (26-3143) |
| 7E000 - 7FFFF | 3F | FF7D - FF7E | Speech/Sound Cartridge ([[SSC]]) (26-3144A) |
| 7E000 - 7FFFF | 3F | FF7F | Multi-Pak Interface ([[MPI]]) (26-3024, 26-3124, 26-3124A) Slot Select |
| 7E000 - 7FFFF | 3F | FF90 - FFBF | TCC1014 VC2645QC ACVC [[GIME]] [[MMU]] [[Palette]] |
| 7E000 - 7FFFF | 3F | FFC0 - FFDF | [[MC6883]] Synchronous Address Multiplexer [[SAM]]  |
| 7E000 - 7FFFF | 3F | FFE0 - FFEF | |
| 7E000 - 7FFFF | 3F | FFF0 - FFFF | Motorola [[MC6809E]] :: Hitachi [[HD6309E]] :: [[Stacks]] :: [[Vectors]] :: [[CPUID.cas]] |

  * MMU Block: 8192 bytes
  * SAM Page: 32768 bytes

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