This is my baby . 
The Commodore 64 was an amazing machine when it was introduced in January of 1982. It had a whopping 64 kilobytes of user RAM, 16 colors at a resolution of 320 x 200 pixels, 8 color sprites, and sound that could rival a dedicated sound synthesizer of its day. The most amazing thing of all was that you could get all this for under $600. The cheapest 64k computers of the day were selling at around $1000 and they couldn't match the graphics and sound capabilities of the C-64.
System Architecture
Memory
Microprocessor 6510 Standard on system board 64k
Clock speed 1 MHz Maximum on system board 64k
Bus type CBM proprietary Maximum total memory 512k cartridge
Data bus width 8-bit Memory type and speed 200ns dynamic RAM
Address bus width 16-bit System board memory socket type 16 pin DIP
Interrupt levels N/A Number of memory module sockets 8 soldered
DMA channels N/A Memory used on system board 4164-2/MK4564N-20
Standard Features
Disk Storage
ROM size 20k Internal disk and tape drive bays none
Optional math coprocessor none Standard floppy drives optional
Parallel port type serial Optional floppy drives: up to 8
RS232C serial ports yes * 5 1/4 inch 160k optional
Mouse ports yes - joystick * 5 1/4 inch 1.2MB No
UART chip used N/A * 3 1/2 inch 720k No
Maximum speed N/A * 3 1/2 inch 1.44MB No
CMOS real time clock no * 3 1/2 inch 2.88MB No
CMOS RAM none Hard disk controller included No
Sound Interface device SID 6581 / 28 pin DIP
Video & Graphics
Sound
Graphics Processor VIC II 6567 / 40 pin DIP
Screen size - Col x Rows 40 x 25 Sound generation 3 voices
Resolution - Colors/High 16 - 320 x 200 pixels ADSR capable yes
Resolution - Colors/Low 16 - 40 x 25 Programming language
Max colors 16 Built in language PET BASIC ver 2.0
Sprites or Missiles 8 - 21 x 24 pixels Built in M L monitor no
Expansion Slots
Keyboard Specs.
Total adapter slots 1-8 bit Number of keys 66
Number of 8/16/32 bit slots 1/0/0 Upper/lower case yes/yes
Keyboard cable length N/A
Physical Specs.
Environmental Specs
* Height 3 inches Operating voltage @ 60 Hz 117 VAC
* Width 16 inches Maximum power supplied 40 watts
* Depth 8 inches Power supply output - volts 9 vdc / 5 vdc
* Weight 4 1/2 pounds Power supply output - amps
