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NAME  

COSMAC ELF

MANUFACTURER  

Hobby computer

TYPE  

Training Computer

ORIGIN  

U.S.A.

YEAR  

1976

KEYBOARD  

4 control switches and 8 data switches

CPU  

RCA CDP1801 microprocessor

RAM  

256 bytes

TEXT MODE

2 alpha-numeric characters on LED display

GRAPHICS MODE;

None

COLORS

None

SOUND

None

SIZE/WEIGHT

5 x 6 x 1 inch/8 oz

I/O PORTS

None

POWER SUPPLY

External 9VDC

PEREPHERIAL

None

PRICE

Unknown

 

COSMAC ELF

In August 1976 issue of Popular Electronics magazine, Joseph Weisbecker published a design for "Low-cost experimenter's microcomputer" using RCA's COSMAC CDP1802 microprocessor chip. It is a very simple computer having 256 bytes of memory, switches as input and LED as output. No ROM, every time you turn it on you have to enter program to RAM by toggling 8 switches, one for each bit. After the switches are set, pressing IN-button stores that byte to memory and increments address. Remember, that it only had 256 bytes of RAM, so it was not that big deal, but still takes some time. There is no way to step address backwards - if you made a mistake you have to start from beginning.

COSMAC ELF became a hit among hobbyists in the USA. It was simple to build by almost anyone and the components didn't cost much. Later more designs based on ELF like Netronics ELF II and Quest Super-ELF appeared.


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