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The C64 Direct-to-TV, called C64DTV for short, is a single-chip implementation of the Commodore 64 computer, contained in a joystick (modeled after the mid 1980s Competition Pro joystick) with 30 built-in games. The design is similar to the Atari Classics 10-in-1 TV Game. The circuitry of the C64DTV was designed by Jeri Ellsworth, a self-taught computer chip designer who had formerly designed the C-One.
Tulip Computers (which had acquired the Commodore brand name in 1997) licensed the rights to Ironstone Partners, which cooperated with DC Studios, Mammoth Toys, and "The Toy:Lobster Company" in the development and marketing of the unit. QVC purchased the entire first production run of 250,000 units and sold 70,000 of them the first day they were offered.
There exist multiple versions of the C64DTV. DTV1 (NTSC television type) comes with 2 MB ROM. It first appeared in late 2004 for the American/Canadian market. DTV2 (called C64D2TV sometimes) is a revised version for the European and world markets (PAL television type) and appeared in late 2005. The ROM has been replaced by flash memory in these devices. However, the DTV2/PAL version suffers from a manufacturing fault, which results in poor colour rendering (the resistors in the R-2R ladder DACs for both the chroma and the luma have been transposed). In the DTV3, a problem with the blitter was fixed. Another DTV variant is the Radio Shack "HUMMER Off-Road Racing Challenge Video Game".
Hardware Specifications 
- Core circuity
- implementing a 6510 at 1 MHz
- DTV2 and later: Enhanced CPU (fast/burst mode, additional registers and opcodes, support for illegal ops of the 6510)
Built-in games 
- Summer Games
- Winter Games
- Pitstop II
- Super Cycle
- Jumpman Jr.
- Impossible Mission
- Impossible Mission II
- Championship Wrestling
- Gateway to Apshai
- Sword of Fargoal
- World Karate Champion (AKA International Karate) (NTSC has two versions labeled "A" and "B")
- California Games
- Silicon Warrior (NTSC only)
- Alleykat (PAL only)
- Nebulus (Called "Tower Toppler" in NTSC version)
- Cyberdyne Warrior
- Cybernoid I
- Cybernoid II: The Revenge
- Marauder (PAL only)
- Head the Ball (PAL only)
- Mission Impossibubble (PAL only)
- Netherworld (PAL only)
Image Works 
Known hardware mods
- keyboard connector
- external joystick (Port 1 and 2)
- floppy connector
- power unit connector
- fixing the palette problems of the PAL version (to some degree this is possible in software by adjusting palette entries)
- S-Video connector
- user port
- Original C64 casing and PS2 keyboard 
- Data transfer cable (Parallel port (or USB/serial port via DTV2ser) to Joystick or user port)
- SD card interface 1541-III or MMC2IEC
The internal flash memory is accessible as device 1. However, software is not included to support write operations so high score saving is not possible. Also, flash devices used in the DTV are specified for a very limited number of write accesses only.
When adding the Keyboard-Mod, be aware that The F7 key does not work. There is a workaround, the "Keyboard Twister".
The DTV contains software-flashable memory. A number of tools have been released to compile programs into DTV-compatible flash images and load it onto the DTV. People made their own game compilations, adding popular (sometimes DTV-fixed) games that were not in the original DTV, added boot menus to make homebrew software development easier or enable new features, for example transfer programs like DTVtrans for transferring data from PC to DTV RAM and vice versa via the PC parallel port (or USB) and the DTV joystick port.
- The Commodore 64 bounces back to life as a Direct-To-TV plug and play Joystick! // GamesIndustry.biz[dead link]
- "C64DTV in original C64 case". Joco.homeserver.hu. Retrieved 2011-07-19.
- "Keyboard Twister by Shadowolf". Picobay.com. 2009-10-02. Retrieved 2011-07-19.
- DTV Hacking Wiki - DTV versions overview, HOWTOs, DTV Programming guide
- VICE - VICE Commodore emulator including C64DTV support
- The Official C64 DTV site - user manual plus some other information
- David Murray's Commodore DTV Hacking
- C64DTV stuff by tlr Flash Tool, ML-Monitor, PC<->DTV transfer system
- Mr. Latch-up's C64 DTV & Hummer Advice Column
- A page about the history of the device
- Details on fixing colour problem on PAL DTVs - Note that surface-mount soldering skills are required.
- DTVtrans, connecting a DTV to a PC via parallel port
- DTV2ser, connecting a DTV to a PC/Mac via USB or serial port
- Four ways to turn a C64 DTV into a C64 clone
- Grokk´s DTV Stuff DTVBIOS and DTVBASIC - make your DTV code-ready.