1976 MOS KIM-1
Computer System
Complete, fully tested and functional.

One of the first personal computers.

Original from 1976, this forty year old vintage computer system includes the following items:

KIM-1 Board (Rev. D) in Original Factory Condition.
Fully Operational. 100% Tested. Complete and Ready to Run.
 
Panasonic Model RQ-2102 Cassette Tape Player/Recorder
Requiring 120 VAC @ 60 Hz, 6 Watts.
 
ELPAC Model WM113 Regulated DC Power Supply providing
+5V @ 860 mA, +12V @ 300 mA, and -12V @ 300 mA,
Requiring 120 VAC @ 60 Hz, 22 Watts.
 
Custom Interface Board with a 20 mA to RS-232 Converter Circuit,
providing TWO DB9F RS-232 Ports, pinout compatible with IBM PC
COM Port extension cables.
 
All necessary AC, DC, signal and Cassette Player cables.
 
A Cassette Tape containing a KIM-1 Test Program.
Ready to Load and Run.
 
TWO New, Blank Cassette Tapes.
 
THREE 44-Pin (2x22) Card-Edge Connectors for Application
and Expansion Connections.
 
COMPLETE Manual Set and Documentation Package on CD-ROM Disk.
 

Documentation Package Contains:
 
KIM-1 User Manual as ".pdf" file.
MCS6500 Family Hardware Manual as ".pdf" file.
MCS6500 Family Programming Manual as ".pdf" file.
 
FULL KIM-1 Schematic Diagram as ".gif" file.
 
First Book of KIM as ".pdf" file.
KIM-1 Quick Reference as ".pdf" file.
Custom Interface Board Schematic as ".pdf" file.
 
KIM-1 ROM Monitor Source Code as ".txt" file.
KIM-1 ROM Monitor Assembly Language Program Listing as ".txt" file.
 
Cabling & Setup Instructions as ".txt" file.
Test Program Loading & Execution Instructions as ".txt" file.
Test Program Assembly Language Listing as ".txt" file.
 
Miscellaneous Historical Documents as Magazine Articles, Magazine Ads,
and Sales Brochures stored on CD.

Note: The documentation can be purchased from a separate listing in our ebay store.  See other listings.

Own it today at the
ORIGINAL SELLING PRICE!
(corrected for inflation)


MOS KIM-1 History

(History excerpt from Wikipedia under their fair use agreement)

The KIM-1, short for Keyboard Input Monitor, was a small 6502-based single board computer developed and produced by MOS Technology Inc. and launched in 1976. It was very successful in that period, due to its low price (following from the inexpensive 6502) and easy-access expandability.

See photos for the introductory advertisement for the KIM-1 microcomputer, from May 1976.

The KIM-1 consisted of a single printed circuit board with all the components on one side. It included three main IC's; the MCS6502 CPU, and two MCS6530 Peripheral Interface/Memory Devices. Each MCS6530 comprises a mask programmable 1024 x 8 ROM, a 64 x 8 RAM, two 8 bit bi-directional ports, and a programmable interval timer.  The KIM-1 brochure said "1 K BYTE RAM" but it actually had 1152 bytes. The memory was composed of eight 6102 static RAMs(1024 x 1 bits) and the two 64 byte RAMs of the MCS6530s. In the 1970s memory sizes were expressed in several ways. Semiconductor manufacturers would use a precise memory size such as 2048 by 8 and sometimes state the number of bits (16384). Mini and mainframe computers had various memory widths (8 bits to over 36 bits) so manufacturers would use the term "words", such as 4K words. The early hobbyist computer advertisements would use both "words" and "bytes". It was common to see "4096 words", "4K (4096) words" and "4 K bytes". The term KB was unused or very uncommon. The KIM-1 was introduced in the April 1976 issue of Byte magazine and the advertisement stated "1 K BYTE RAM" and "2048 ROM BYTES".

Also included were six 7-segment LEDs (similar to those on a pocket calculator) and a 24-key calculator-type keypad. Many of the pins of the I/O portions of the 6530s were connected to two connectors on the edge of the board, where they could be used as a serial system for driving a Teletype Model 33 ASR and paper tape reader/punch).

One of these connectors also doubled as the power supply connector, and included analog lines that could be attached to a cassette tape recorder.

The KIM-1 included a somewhat more complex built-in Terminal Interface Monitor software called TIM that was "contained in 2048 bytes of ROM in two 6530 ROM/RAM/IO arrays". This monitor software included the ability to run a cassette tape for storage, drive the LED display, and run the keypad. As soon as the power was turned on, the monitor would run and the user could immediately start interacting with the machine via the keypad. The KIM-1 was one of the first single board computers, needing only an external power supply to enable its use as a stand-alone experimental computer. This fact, plus the relatively low cost of getting started, made it quite popular with hobbyists through the late 1970s.