Commodore 64

Made in USA by Commodore in 1982
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Units sold: 30 000 000
Launched in 1982, officially discontinued in 1993.
courtesy of Tomi Engdahl
Port on the Commodore C64
5 o o o o o / 1
. o o o o /
.9 `~~~~~~~´ 6
1 Up
2 Down
3 Left
4 Right
5 Analog Y
6 Button
7 Power
8 Ground
9 Analog X

Every system has clones right? Well, the Commodore 64 never had any unauthorized clones and still currently doesn't. At least there were none during its official market run. It wasn't cloned until 2002 when Jeri Ellsworth decided to make an enhanced clone of it. Ah, the 20 year old task task just needed a feminine touch. She created the C-One and was later hired by Tulip Computers (who bought Commodore) to create the C64 Direct-to-TV joystick for them. So technically the C-One was the only unauthorized clone, and it was retroactively authorized:)
The C-One is far too brilliant to go into details here. It just needs to be said that it will hardware emulate, or with the addition of real CPUs plugged into the motherboard, become almost any classic 8-bit and some 16-bit computers. Of course its original specifications was as a super Commodore 64 clone.
C64 Direct-to-TV (C64DTV)
Its an entire Commodore 64 contained in its own Joystick plugged into port 2. It runs on four AA batteries with optional external DC power supply. It contains 30 games from EPYX, Hewson, and Image Works. Additionally, some of the games have added content/additional levels. The circuit board is clearly marked so users comfortable with soldering can see where to add a keyboard connector, joystick Port 1 and/or 2, floppy connector, C64 power unit connector!, palette entry reprogramming interface, S-Video, C64 user port and/or PS2 keyboard. Users with more skill can add a parallel, USB, and/or SD/MMC card drive. Additionally it meets System-on-a-Chip specifications despite everything being contained in a motherboard (its a small motherboard). Software modification alone allows for additional games to be added.

The Commodore Max was the predecessor to the Commodore 64. It was the first computer to have VIC II and SID chips (these being a split/upgrade of the original VIC chip). It only had 2K, cartridge port, cassette port, RF out, and a membrane keyboard. But, it did have two joystick ports. It was sold in Japan (Max) and Germany (VC-10) and USA (Ultimax) but only Japanese Max machines are known to exist today. It was quickly replaced with the Commodore 64 which is 100% backwards compatible. The Commodore 64 in fact has an undocumented (and unnecessary) Max compatibility mode. This mode is exploited by the Action Replay and some other cartridges. All Max games and accessories will work with the Commodore 64.

tech info

resolution: 320 x 200 x 16 colors
memory: 52K RAM, 20K ROM
CPU: 6510
sound: 6581 SID

All Commodore systems

Commodore PET1977
Commodore 641982
Commodore 16/Plus 41984
Amiga OCS1985
Commodore 1281985
Amiga AGA1992