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The VIC20 memory module actually consists of two modules. The "VIC20MEM" module is mandatory and contains the RAM dump. The "VIC20ROM" module is optional and contains a dump of the ROM images.
The size of the VIC20 memory modules differs with each different memory configuration. The RAM configuration is saved in the snapshot, and restored when the snapshot is loaded. The attached cartridges are also restored upon load if they have been saved in the snapshot.
The VIC20MEM module
Version numbers: Major 1, Minor 0
Type | Name | Description |
BYTE | CONFIG | Configuration register. Bits 0,1,2,3,5 reflect if the corresponding memory block is RAM (bit=1) or not (bit=0). |
ARRAY | RAM0 | 1KiB RAM dump $0000-$03ff |
ARRAY | RAM1 | 4KiB RAM dump $1000-$1fff |
ARRAY | COLORRAM | 2KiB Color RAM, $9400-$9bff |
ARRAY | BLK0 | if CONFIG & 1 then: 3KiB RAM dump $0400-$0fff |
ARRAY | BLK1 | if CONFIG & 2 then: 8KiB RAM dump $2000-$3fff |
ARRAY | BLK2 | if CONFIG & 4 then: 8KiB RAM dump $4000-$5fff |
ARRAY | BLK3 | if CONFIG & 8 then: 8KiB RAM dump $6000-$7fff |
ARRAY | BLK5 | if CONFIG & 32 then: 8KiB RAM dump $a000-$bfff |
The VIC20ROM module
Version numbers: Major 1, Minor 1
Type | Name | Description |
BYTE | CONFIG | Bit 0: 1= ROM block $2*** enabled. Bit 1: 1= ROM block $3*** enabled. Bit 2: 1= ROM block $4*** enabled. Bit 3: 1= ROM block $5*** enabled. Bit 4: 1= ROM block $6*** enabled. Bit 5: 1= ROM block $7*** enabled. Bit 6: 1= ROM block $A*** enabled. Bit 7: 1= ROM block $B*** enabled. |
ARRAY | KERNAL | 8KiB KERNAL ROM image $e000-$ffff |
ARRAY | BASIC | 16KiB BASIC ROM image $c000-$dfff |
ARRAY | CHARGEN | 4KiB CHARGEN ROM image |
ARRAY | BLK1A | 4KiB ROM image $2*** (if CONFIG & 1) |
ARRAY | BLK1B | 4KiB ROM image $3*** (if CONFIG & 2) |
ARRAY | BLK3A | 4KiB ROM image $6*** (if CONFIG & 16) |
ARRAY | BLK3B | 4KiB ROM image $7*** (if CONFIG & 32) |
ARRAY | BLK5A | 4KiB ROM image $A*** (if CONFIG & 64) |
ARRAY | BLK5B | 4KiB ROM image $B*** (if CONFIG & 128) |
ARRAY | BLK2A | 4KiB ROM image $4*** (if CONFIG & 4; added in V1.1) |
ARRAY | BLK2B | 4KiB ROM image $5*** (if CONFIG & 8; added in V1.1) |
Next: PET memory module, Previous: C128 memory module, Up: Module formats [Contents][Index]