Artifact Details

Title

COSMAC ELF microcomputer

Catalog Number

X692.86

Type

Physical object

Date

1976

Manufacturer

Netronics Research and Development, Ltd.

Place Manufactured

U.S.

Identifying Numbers

Model number ELF
Serial number Prototype

Dimensions

12 x 12 x 5 in.

Description

Item is built by donor. he ELF II was originally described in a construction article in Popular Electronics magazine published as a four-part series in 1976-77. It was based on the RCA 1802 mciroprocessor and offered the first wave of microcomputer enthusiasts an inexpensive means of learning about both hardware and software. CPU: RCA CDP 1802 COSMAC; Clock frquency: 1 Mhz; RAM: 256 bytes; ROM: none; Input: 8 toggle switches (for data input) Control lines: INPUT (pushbutton) - LOAD (toggle) - MEMORY PROTECT (toggle) - RUN (toggle); Output: 2 hex displays - 1 LED (controlled by output line Q); Power: 5V regulator (on board) - 9V DC 350mA wall supply; Type of construction: point-to-point hardwiring - all IC's socketed; Later additions: input switch for DMA - 8-bit I/O port for remote operation from OSI C1P keyboard. CPU marked: RCA CDP1802CD 7653. Nice photo is A/F.

Category

Digital computer: desktop

Lot Number

X692.86