Jabarkan chip pendukung dari Intel 4004

4001: 256-byte ROM (256 8-bit program instructions), and one built-in 4-bit I/O port*

4002: 40-byte RAM (80 4-bit data words), and one built-in 4-bit output port; the RAM portion of the chip is organized into four "registers" of twenty 4-bit words:

16 data words (used for mantissa digits in the original calculator design)

4 status words (used for exponent digits and signs in the original calculator design)

4003: 10-bit parallel output shift register for scanning keyboards, displays, printers, etc.

4008: 8-bit address latch for access to standard memory chips, and one built-in 4-bit chip select and I/O port*

4009: program and I/O access converter to standard memory and I/O chips*

* Note: a 4001 ROM+I/O chip cannot be used in a system along with a 4008/4009 pair.