
![]() |
Building a Digital Group System |
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A KIM-1 Sidereal clock |
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Advert KIM meets S100, KIMSI |
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6502 disassembler Steve Wozniak Allan Baum |
See also:

My KIM-1 expansions in Radio Bulletin

Teach KIM to Sing

Radio Bulletin articles in English

About small SBC systems

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Building a Digital Group System |
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A KIM-1 Sidereal clock |
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Advert KIM meets S100, KIMSI |
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6502 disassembler Steve Wozniak Allan Baum |





Franzis Verlag, German, 1978




Pages from CHIP 9 1978 and CHIP Special 1981







Nils a.k.a. netzherpes typed in a number of KIM-1 programs to run on his PAL-1, the KIM-1 compatible clone.
Not only does he types them in in assembler, some even by contacting the original author!, tests the programs and also provides source and ready to run binaries or papertapes.
And he draws nice looking cover images!
On his github page he has the most recent versions and adds new programs regularly.
Also checkout his blog!
Here a summary of the programs:
KIM-1 Banner
by Jim Zuber
from KIM USER NOTES #18

Download here!
You have 20 shots to detect a 3×1 ship on a 8×8 grid. The ship can be aligned horizontal, vertical or diagonal.
How to play: Enter the coordinated and fire (Button F). If you hit the ship, the mostright counter will jump to 01.
If you hit all 3 coordinates of the ship, you won, the display will show “dEAd” and the number of shots used.
(c) 1978 Roland Kushnier (orig)
(c) 1979 Jody Nelis (bugfix)

Download here!
Little shooting game for the KIM-1
June 18th, 1979
(C) Fer Weber

Download here!
The 6 column Version of Fer Webers Target1 Shooter Game (https://github.com/netzherpes/Target1-for-KIM-1)
Author Fer Weber
published in KIM Kenner 8 on 18.06.1979

Download here!
original title: “Datensuche”
by Herwig Feichtinger
(c) 1981 in Anwendungsbeispiele für den Mikroprozessor 6502

Download here!
original title: “Datensuche”
by Herwig Feichtinger
(c) 1981 in Anwendungsbeispiele
für den Mikroprozessor 6502

Download here!
by Siep de Vries, KIM Club The Netherlands
INPUT/OUTPUT IS EITHER TELETYPE
OR KIM KEYBOARD AND DISPLAY

Download here!
(c) 1979 Anthony T. Scarpelli
found in micro 6/79

Download here!
a silly small Piano for your KIM-1
KIM Piano
(c) by Peter Engels 1979 *
plays whole notes from C to D
by pressing the buttons 0-F.
Download here!
The author of the program, Kiumi Akingbehin, Professor at the Michigan University

Download here!
(c) 29.7.80 Myron A. Calhoun
Manhattan, KS

Download here!
an extension to M.Gönners hex Loader by Bruce Nazarian
Located in Compute II June 1980
Download here!

by Gino F. Silvestri
A Simon says game for the KIM-1
Download here!
This is a walkthrough of one of the most amazing computer games in history.
KIMventure is a (colossal cave like) adventure game for the KIM-1 that fits in only 1 (ONE) KB of RAM. It offers 24 room to explore with a lot of traps and riddles to solve. It was programmed in 1979 by Robert Leedom with pen and paper (no assembler etc.)

Download here!




Seawell produced many KIM-1/SYM-1/SIM 65 boards.
Manuals scanned by Clayton Seale, thanks!
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Little Buffered Motherboard manual |
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Seawell 16K RAM board |
Here some advertisements from the 6502 User notes.





Some photos of Seawell products.
Seawell SEA-16 RAM Expansion Board (REV C)







Seawell Little Buffered Motherboard (LBM 4034)









Brutech Electronics Microsystems – B.E.M
Gebroeders Bruyn, Vinkeveen. Small company, custom made electronics and standard microprocessor boards and systems aimed at industry and hobbyist.
During my years with Radio Bulletin we often worked with Brutech, and I visisted their office/manufacturing plant in Vinkeveen several times. The BEM-bus became the standard bus for expansion at Radio Bulletin after the first BEM-1 card was connected to the KIM-1 by Dick de Boer. Brutech specialized in the beginning on the KIM-1/VIM/SYM-1 expansion cards, later on they made their own CPU cards and besides the 6502 cards with CPUs like the 6809 were available.
Products designed and/or sold by Brutech, if applicable a link to available information is given.
(with thanks to Gerben Voort, René Rutten, Fred Jan Kraan en Robert Henneke)










A 4K SRAM card in small format for KIM-1, SYM-1 and AIM 65.
I own this 4K RAM card.

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BEM-4KPlus |

Low cost 6502 CPU card
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BEM-CPU-1 circuit diagram |
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BEM-CPU-1 |
6502 SBC2 or 6809 SBC3 based card.


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BEM-SBC3 circuit diagram |
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B.E.M.-SBC2X/SBC3X datasheet |
A video card with the 6545 controller. Black and white composite.
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B.E.M-VIDEO-1 datasheet |
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B.E.M-MON-1 for B.E.M-CPU-1 |



A simple 2K SRAM card with 16 2102 ICs. Used in the first hardware expansion article in Radio Bulletin 1977.
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B.E.M-1 2K SRAM |
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Geheugenuitbreiding voor de KIM Radio Bulletin November 1977 Original article |
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Memory expansion for the KIM RB Nov 77 English |
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Geheugenuitbreiding KIM Dutch |
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Memory expansion for the KIM source and binary |

A 19 inch rack based system with eurocards. a development system, floppy drive based.
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BEM Impact 1000, Januari 1980, Hans Otten |
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De PC100 getest (AIM 65), Augustus 1980, Hans Otten |
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Samson en Satellite getest, November 1980, Hans Otten |
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Article about the BEM bus system by CJ de Bruyn Brutech |
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De VIM getest, November 1978 |
1K SRAM, 3x 2708 EPROM





Hudson Digital Electronics Inc
Known by advertisments in the KIM-1/User Notes.






KIM-1, AIM-65, SYM-1 and other 6502/65C02/65C816 related books.
A mix of English, German and Dutch books.
On my bookshelf I have quite a collection of books on the 6502 family.
Note that manuals and books that come with systems are shown on the pages of the corresponding system!




Micro Technology Unlimited produced a lot of hardware and software for the KIM-1, SYM-1, AIM 65 and more.
The company is still in business, now sells Karaoke software.
On these pages I have collected what is known about MTU and the products for the KIM-1 (and the MTU-130/140).
With thanks to David Williams, Eric Wright, Dave Plummer, Jack Rubin and Eduardo Casino.













Forethought Systems produced a motherboard, the KIMSI, for the KIM-1 in 1977 that enables to add 8 S-100 boards to a KIM-1.
The S-100 standard, developed for the IMSAI and such 8080/Z80 systems, was a huge success that made affordable standardized systems available, mostly with CP/M as operating system.
The KIMSI married the 6502 world to these pool of boards. The KIMSI was sold as kit, with one S-100 connector. OF the KIMSI’s I have seen most were used with a memory board.
I acquired a KIMSI in August 2026. It was build into a plexiglas/aluminium case, with a KIM1 (Rev G) and a ‘microcalculator board’. For photos see below.
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KIMSI Interface/Motherboard Assembly /Operating manual Improved version August 2026 |
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KIMSI brochure |
The BETSI: S-100 bus for the PET

My KIMSI
I acquired a KIMSI in August 2026. It was build into a plexiglas/aluminium case, with a KIM1 (Rev G) and a ‘microcalculator board’. I took the system apart, no room to store the big ugly thing.









Other KIMSI photos from the internet



