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T > TANDY RADIO SHACK  > Color Computer 2   

Tandy Radio Shack
Color Computer 2

The Color Computer 2 (coco2) replaced the Color Computer "Model 1" in 1983. It has the same characteristics than the Model 1 but has a better keyboard and a more integrated circuitry.

There were several models of the Coco2, some with only 8k ROM (Color Basic) called Standard Color Computer 2, and others with 16k ROM (Extended Color Basic) called the Extended Color Computer 2. Some later models differ also in RAM capacity (16k, 32k or 64k).

It was replaced with the Color Computer 3 in 1986.


About the double speed, Gary Clouse specifies:
The double speed mode was not really accomplished by changing the clock speed. The Synchronous address multiplexor (SAM) chip by default generated memory refresh cycles for the entire address space. the "double speed poke" disabled the refresh cycle for the upper 32k memory address, where the ROM was mapped. Since the ROM was static, it didn't need this and since BASIC spent most of its time in the rom routines, it would appear to nearly double the speed. The flip side of this was that many I/O functions that relied on timing loops would be unusable, such as saving data to a tape. Also if you were using the upper 32k of ram, the double speed poke would wipe the memory.

NAME  Color Computer 2
MANUFACTURER  Tandy Radio Shack
TYPE  Home Computer
YEAR  1983
KEYBOARD  Full-stroke keyboard, 53 keys.
Arrow keys, BREAK, CLEAR, SHIFT (x2)
CPU  Motorola 6809E
SPEED  0,89 Mhz (1,8 Mhz by programming the clock generator)
RAM  16 KB, 32 KB or 64 KB, depending on models
ROM  8 KB (Color Basic), but later models had 16 KB (Extended Color Basic)
TEXT MODES  32 x 16
GRAPHIC MODES  256 x 192 (2 colors), 128 x 192 (2 and 4 colors), 128 x 96 (4 and 2 colors), 32 x 64 (8 colors)
SOUND  1 voice (6-bit DAC)
SIZE / WEIGHT  9 x 35 x 37,5 cm
I/O PORTS  Expansion/Cartridge connector, two analog joystick connectors, cassette interface (1500 bauds), RS232 serial port, TV RF connector
OS  OS9 Level 1 with disk-drives
PRICE  16k standard model : $159.95 (USA, 84)
16k extended model : $199.95 (USA, 84)
64k extended model : $259.95 (USA, 84)

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