====== Memory model ======

The following addresses are subject to change. Visit this page for updates.
===== Zeropage =====

[pet] [vic20] [c64] [c16] [cplus4] [c128]

| $02-$14    | 18 bytes     | XC=BASIC Virtual Registers        |
| $16-$3B    | 38 bytes     | Floating point workspace      |
| $3C-$69    | 45 bytes     | Free space for [[v3:variables#fast_variables|FAST variables]]  |

[x16]

| $22-$34    | 18 bytes     | XC=BASIC Virtual Registers        |
| $35-$7F    | 74 bytes     | Free space for [[v3:variables#fast_variables|FAST variables]]               |
| $A9-$CE    | 38 bytes     | Floating point workspace      |

===== Other reserved areas =====

[vic20] [c64] [c16] [cplus4] [c128]

| $033C-$03FB    | 192 bytes     | Temporary storage during string operations  |

[pet]

| $033A-$03F9    | 192 bytes     | Temporary storage during string operations  |

[x16]

| $0400-$04BF | 192 bytes     | Temporary storage during string operations  |
===== Program code and data =====

==== Commodore-64 ====

| $0801 - $080C | 12 bytes | BASIC Loader (can be disabled) |
| $080D - ???? | | Program code |
| ???? - ???? | | Library |
| ???? - ???? | | Variables |
| ???? - $CEFF | | Function stack (growing downwards) |
| $CF00 - $CFFF | 256 bytes | String stack |

==== Commodore VIC-20 (Unexpanded) ====

| $1001 - $100C | 12 bytes | BASIC Loader (can be disabled) |
| $100D - ???? | | Program code |
| ???? - ???? | | Library |
| ???? - ???? | | Variables |
| ???? - $1CFF | | Function stack (growing downwards) |
| $1D00 - $1DFF | | String stack |

==== Commodore VIC-20 (3K Expansion) ====

| $0401 - $040C | 12 bytes | BASIC Loader (can be disabled) |
| $040D - ???? | | Program code |
| ???? - ???? | | Library |
| ???? - $1CFF | | Function stack (growing downwards) |
| $1D00 - $1DFF | | String stack |

==== Commodore VIC-20 (8K expansion) ====

| $1201 - $120C | 12 bytes | BASIC Loader (can be disabled) |
| $120D - ???? | | Program code |
| ???? - ???? | | Library |
| ???? - ???? | | Variables |
| ???? - $3EFF | | Function stack (growing downwards) |
| $3F00 - $3FFF | | String stack |

==== Commodore-16 ====

| $1001 - $100C | 12 bytes | BASIC Loader (can be disabled) |
| $100D - ???? | | Program code |
| ???? - ???? | | Library |
| ???? - ???? | | Variables |
| ???? - $3EFF | | Function stack (growing downwards) |
| $3F00 - $3FFF | | String stack (growing downwards) |

==== Commodore Plus/4 ====

| $1001 - $100C | 12 bytes | BASIC Loader (can be disabled) |
| $100D - ???? | | Program code |
| ???? - ???? | | Library |
| ???? - ???? | | Variables |
| ???? - $7EFF | | Function stack (growing downwards) |
| $7F00 - $7FFF | | String stack |

==== Commodore-128 ====

| $1001 - $100C | 12 bytes | BASIC Loader (can be disabled) |
| $100D - ???? | | Program code |
| ???? - ???? | | Library |
| ???? - ???? | | Variables |
| ???? - $BEFF | | Function stack (growing downwards) |
| $BF00 - $BFFF | 256 bytes | String stack |
==== Commander X16 ====

| ???? - $06FF | | Function stack (growing downwards) |
| $0700 - $07FF | 256 bytes | String stack |
| $0801 - $080C | 12 bytes | BASIC Loader (can be disabled) |
| $080D - ???? | | Program code |
| ???? - ???? | | Library |
| ???? - ???? | | Variables |