I'm considering producing a limited edition of a Cuttle Cart II style SD cartridge for the ColecoVision.
I've done a little work on it already, here is a brief description of the cartridge features currently planned.
Basic Hardware (Preliminary)
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50 MIPS CPU with high speed SD Interface, internal Flash memory for cartridge settings.
SD and SDHC Support, no practical limits on number of games stored.
512KBytes of RAM (Largest currently existing game is a 128KB Mega-Cart)
128KBytes of Non-Volatile Memory Diagnostic/Boot/Storage Memory
Cartridge boot time, from power on to FAT32 display expected to be less than two seconds.
Cartridge load time for a 32K ROM image less than one second.
Full Read/Write access to all 512KB+ of memory for games using the new Hybrid bank switching mode.
Device Specs (Preliminary)
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Support all currently known ColecoVision cartridge formats, including Mega-Cart games and Lord of the Dungeon.
New 512KB Hybrid Bank Switching mode allowing new games full Read/Write access to 512KB of RAM.
Programmer API for accessing cartridge services at run time.
Programmer API will effectively allow creation of games of true unlimited size, as game banks, level data, save game data, etc can all be dynamically loaded from and saved to SD card in microseconds while the game is running.
Cartridge logic, CPU firmware and Boot Flash memory all fully upgradable via SD card.
Cartridge system software loaded dynamically from SD card at power on.
Ability to display Colecovision game screen shots and manuals from menu.
No special menus creation or other PC loading software required.
Cartridge will be able to automatically read and display files present on your FAT32 formatted SD card.
This means no dependence on Windows drivers or software, you can create and load your card from any operating system that can read/write a FAT32 or FAT16 formatted SD or MMC memory card.
Availability/Price
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No ETA/price yet, but I due to personal time constraints I expect this to be a limited edition run of cartridges.
More information should be available soon.
If you have any feature requests/comments/etc please feel free to ask.
Steve