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Reposted by @hansotten.bsky.social

Hans @hvs.bsky.social · 26/09/2026

@hansotten.bsky.social @kim-6502.bsky.social Since I used photos and documents from your site, Hans, I thought I would let you know that I had Claude build a cross-platform KIM-1 emulator in C# and Avalonia (a cross-platform UI library). github.com/cantpitch/Ki...

github.com

GitHub - cantpitch/Kimulator: A Cross-Platform KIM-1 Emulator

A Cross-Platform KIM-1 Emulator. Contribute to cantpitch/Kimulator development by creating an account on GitHub.

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hansotten.bsky.social @hansotten.bsky.social · 23/09/2026

A short one on the KIM 6530 timer, also applicable on the 6532 timer: KIM Clock and timer, Radio Bulletin May 1980 retro.hansotten.nl/radio-bullet...

retro.hansotten.nl

Radio Bulletin articles in English – Retro Computing

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hansotten.bsky.social @hansotten.bsky.social · 22/09/2026

Added one more KIM-1 program today. Not from Radio Bulletin, but from Byte Book of Computer Music 1979: Teach KIM to Sing retro.hansotten.nl/6502-sbc/kim...

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hansotten.bsky.social @hansotten.bsky.social · 20/09/2026

Radio Bulletin published many articles around the KIM-1 in Dutch. I started a new project: translate the articles to English wit source, binary Articles now published Mastermind on the KIM Morse decoding with the KIM Melodiant Frequencymeter EPROM Programmer retro.hansotten.nl/radio-bullet...

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Reposted by @hansotten.bsky.social

Wi-Fi Sheep Tech Channel @wifisheep.bsky.social · 12/09/2026

The first #Commodore computer? I finally got around to building my #8bit #KIM1 Uno An #Arduino based recreation of the classic MOS KIM-1 and a great little #6502 retro computing project. Watch the full build here: youtu.be/mdHqsPDwnJ0 #RetroComputing #VintageComputing

youtu.be

#KIM #UNO A clone of...The first #commodore computer? #8bit #arduino build project!

YouTube video by Wi-Fi Sheep Tech Channel

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Reposted by @hansotten.bsky.social

osolabstech.bsky.social @osolabstech.bsky.social · 15/09/2026

Episode 3 of the 20c Use the OpenSource Duino Protocol analyzer to study all the buses of a 6502 processor. en.osolabs.tech/the20c/the-2...

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hansotten.bsky.social @hansotten.bsky.social · 09/09/2026

MICROCALCULATOR MODEL-85 A board that serves as a calculator accessible via a parallel 8 bit port, e.g. from a KIM-1. Send commands and read the calculated results. Made by Artisan Electronics in 1977. Acquired August 2026, as built in a KIM-1 with KIMSI system

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hansotten.bsky.social @hansotten.bsky.social · 29/08/2026

retro.hansotten.nl/6502-sbc/app... A PAL version of the (now open source hardware) Apple 1 Replica by Vince Briel, great work by ExPLIT

retro.hansotten.nl

Replica 1 TE PAL version – Retro Computing

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hansotten.bsky.social @hansotten.bsky.social · 29/08/2026

Found a scan of 'Microprocessor programming and applications for scientists and engineers (Richard R. Smardzewski' Aimed at the 6502 with AIM 65 examples. retro.hansotten.nl/microprocess...

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hansotten.bsky.social @hansotten.bsky.social · 23/08/2026

A boxed VIM-1 acquired in August 2026. The early SYM-1, the rename due to a naming conflict.

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hansotten.bsky.social @hansotten.bsky.social · 23/08/2026

In August 2026 I acquired an boxed engineering [SYM-2]prototype. It comes with two large circuit diagrams illustrating the design. retro.hansotten.nl/6502-sbc/syn...

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hansotten.bsky.social @hansotten.bsky.social · 22/08/2026

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. Photos and a high quality manual and brochure retro.hansotten.nl/6502-sbc/kim...

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hansotten.bsky.social @hansotten.bsky.social · 16/08/2026

With a system with a KIM-1 and a KIMSI I acquired came a board. The board is connected to the Application connector. IT has the markings microcalculator model-85. The display is made by HP 7447632K 14 digits. there are some unidentified ICs, 1CA-85, 1CD-85A. Any clue?

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hansotten.bsky.social @hansotten.bsky.social · 14/08/2026

With thanks to Jonathan Chapman of Glitchworks who found a Jolt system, here images of a Jolt with 4K memory, an experimenters board and the power supply. Here the images: retro.hansotten.nl/6502-sbc/jol...

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hansotten.bsky.social @hansotten.bsky.social · 03/08/2026

KB-9 or MOS TECH 6502 BASIC V1.1, a 9 digit BASIC for the KIM-1 The same BASIC as in the first PET , OSI, Applesoft. One of the first products of MICRO-SOFT Telephone support by Bill Gates and Paul Allen! Updated, improved and enhanced information and downloads retro.hansotten.nl/6502-sbc/kim...

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hansotten.bsky.social @hansotten.bsky.social · 30/07/2026

A deep dive into the TIM 6530-004 Jolt Superjolt Demon software. 1K 6502 code from 1975. The Jolt was maybe the first 6502 based computer, before the KIM-1 and la year before the Apple 1 retro.hansotten.nl/6502-sbc/jol...

retro.hansotten.nl

JOLT TIM DEMON explained – Retro Computing

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hansotten.bsky.social @hansotten.bsky.social · 23/07/2026

A bug in the KIM-1 monitor. I continued my pages on the KIM Explained and found a bug in the KIM-1 monitor: KIM 0200 A9 ;; 00BB 00 :: 00AA 00 ???? FFFF 1C The KIM-1 accepts ':'– '?', as hex characters A ..F! Read more about this in one of the KIM-1 Explained . retro.hansotten.nl/6502-sbc/kim...

retro.hansotten.nl

PRTBYT, GETBYT and PACK – Retro Computing

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Reposted by @hansotten.bsky.social

GrantMeStrength @grantmestrength.bsky.social · 22/07/2026

Yes it’s real. apps.apple.com/us/app/virtu...

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hansotten.bsky.social @hansotten.bsky.social · 13/07/2026

The KIM-1 explained Based upon my experience and study of the KIM-1 since 1979. Many notes on paper and files everywhere. Now consolidated in a lot of pages. retro.hansotten.nl/6502-sbc/kim...

retro.hansotten.nl

The KIM-1 explained – Retro Computing

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hansotten.bsky.social @hansotten.bsky.social · 09/07/2026

Question on KIM-1: I saw once a table in a magazine with values for the serial interface 110 - 9600 baud CNTL30 and CNTH30 at 17F2 and 17F3 for various baudrates. I can not find it anymore. Any clues?

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Reposted by @hansotten.bsky.social

Neil Andretti @masterhit.bsky.social · 08/07/2026

Thanks to some software tricks, a simple and low-cost add-on circuit, and a new way to speed up a microprocessor, you can now build a video interface for your microcomputer for an investment of only $20 to $35. www.tinaja.com/glib/pop_ele...

tinaja.com

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hansotten.bsky.social @hansotten.bsky.social · 02/07/2026

A refreshed page on suppressing the KIM-1 echo of TTY input, read non-blocking and make the TTY input deaf. Here I present solutions for these problems in software You can have serial input without echo, non-blocking and make the TTY input deaf for input. retro.hansotten.nl/6502-sbc/kim...

retro.hansotten.nl

Suppress the KIM-1 echo – Retro Computing

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hansotten.bsky.social @hansotten.bsky.social · 29/06/2026

Many sources of the KIM-1 monitor are floating around None deliver the real KIM-1 ROMs, . So in June 2026 I have typed in the source as listed in the User manual. Converted to MOS Tech assembler format, delivers the exact ROM binary including 00 filler bytes. retro.hansotten.nl/correct-kim-...

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hansotten.bsky.social @hansotten.bsky.social · 26/06/2026

MOStermind is an implementation of the Mastermind board game for the KIM-1 computer. Developed by HKZ. codeberg.org/hkzlab/MOSte... Does it run on the KIM-1 Simulator? YES! You only have to set the FOCAL_V3D break setting in the Settings.

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hansotten.bsky.social @hansotten.bsky.social · 23/06/2026

I saw an advert on ebay (China seller) for a Rockwell 6503 IC 40 pin. The 6503 has 28! I ordered one I searched the internet for the 338-6503 printed on the IC and found references to it being a R65C02. And indeed, the 6502 testers recognized it as working 65C02. Weird!

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hansotten.bsky.social @hansotten.bsky.social · 14/06/2026

I acquired a 1 MHz IC R6500/1E Microprocessor Emulator Device, an IC made by Rockwell for developing applications for the R6500/1 Microcomputer family. More information on the R6500/1 retro.hansotten.nl/6502-sbc/aim...

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hansotten.bsky.social @hansotten.bsky.social · 04/06/2026

Again Eduardo Casino has enhanced the KIM-1 Simulator V2.3.0 – The Console has now a complete VT100 emulation DEC Special Character set – The K-1008 Visable Memory is fast! – All settings are saved between sessions retro.hansotten.nl/kim-1-simula... Demo here: youtu.be/GPxkr7j1P6k

youtu.be

Demo of KIM-1 Simulator V2.3.0

YouTube video by Hans Otten

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hansotten.bsky.social @hansotten.bsky.social · 25/05/2026

A KIM-3B is a 8K bytes memory expansion made by MOS Technology (already part of Commodore then) for the KIM-4 motherboard. I recently acquired a good looking KIM-3B myself. Nothing new, all is already known about it. Now with photos made by myself!

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hansotten.bsky.social @hansotten.bsky.social · 24/05/2026

New version of the KIM-1 Simulator coming: complete VT100 support in the console!

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hansotten.bsky.social @hansotten.bsky.social · 24/05/2026

TERC, an educational center, has developed around 1980 an interface system for the KIM-1. It makes the I/O available with solderless connections, has a breadbaord and connections for audio tape input/output, power supply and teletype. I recently acquired this up till now unknown interface.

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Reposted by @hansotten.bsky.social

KIM-1 @kim-6502.bsky.social · 23/05/2026

SYM-1 by Synertek was another KIM-1 competitor. Compatible enough to run KIM software, different enough to justify its own manual. The 6502 trainer market of the late '70s was surprisingly crowded.

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Reposted by @hansotten.bsky.social

Neil Andretti @masterhit.bsky.social · 18/05/2026

Much much better <3

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hansotten.bsky.social @hansotten.bsky.social · 10/05/2026

Nice to see my white 6502 CPU is OK, and is indeed missing the ROR instruction.

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Reposted by @hansotten.bsky.social

Neil Andretti @masterhit.bsky.social · 03/05/2026

2 new KIM-1 videos: youtu.be/f0VLC-ol2EA?... youtu.be/-X5MzW2Rz1c?...

youtu.be

Zork and the Z-machine on the KIM-1

YouTube video by masterhit1

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hansotten.bsky.social @hansotten.bsky.social · 01/05/2026

www.youtube.com/watch?v=fVIj... Use a PET as cassette player for the KIM-1

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hansotten.bsky.social @hansotten.bsky.social · 24/04/2026

R65 – A late seventies computer built with a KIM-1 by Rene Richarz. An amazing showcase of how far a KIM-1 and Pascal as programming language can go! Information on the R65 and emulator of this computer on github archive of Rene Richarz Including sources and documentation github.com/rricharz/R65

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Reposted by @hansotten.bsky.social

KIM-1 @kim-6502.bsky.social · 21/04/2026

There are at least seven KIM-1 board revisions, labeled A through G (plus the original unlabeled one). Rev C is a mystery - nobody's confirmed one exists. If you have one, the retro computing world would like a word. retro.hansotten.nl/kim-1-what-changed-in-the-revisions/

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hansotten.bsky.social @hansotten.bsky.social · 17/04/2026

MTU K-1013 FDC emulation added to the KIM-1 Simulator. Eduardo Casino added the FDC support. Now not only the SD Shield but also the upd765 based FDC support allows to run CP/M-65 and the native CODOS for KIM-1 operating systems. retro.hansotten.nl/6502-sbc/kim...

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hansotten.bsky.social @hansotten.bsky.social · 05/04/2026

Wanted a case for a KIM-1? Options in the 80ties were available. Here an example, suitable for educational purposes.

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hansotten.bsky.social @hansotten.bsky.social · 03/04/2026

What changed in the KIM-1 Revisions? The PCB underwent several changes around the logo area, takeover by Commodore . The big change was in the clock circuit between the first edition and Rev A. The first batch of KIM-1 suffered from the issue that the clock would not start. It was fixed in Rev A.

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hansotten.bsky.social @hansotten.bsky.social · 27/03/2026

New versions of KIM-1 Simulator (V2.0.0) with SD Card Shield, CP/M-65 and xKIM, and Jolt Simulator (V0.9). Read all about it here: retro.hansotten.nl/new-versions...

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hansotten.bsky.social @hansotten.bsky.social · 26/03/2026

Eduardo Casino has created a faithful replica of the Jolt single board computer. 6502,6530-004 TIM and 6520. TTY or RS232C 512b RAM. He designed using the information available. The replica on GitHub, github.com/eduardocasin... More information on the Jolt, retro.hansotten.nl/6502-sbc/jol...

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hansotten.bsky.social @hansotten.bsky.social · 23/03/2026

White KIM-1 cleanup This one is a Rev D with a ‘white’ PCB. The KIM-1 is working. The keyboard handmade@. With the DIY keypad method based upon the work of Eduardo Casino and Pete (peo2000)I replaced the keyboard Wires removed clean with alcohol and a brush this KIM-1 may join my collection

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hansotten.bsky.social @hansotten.bsky.social · 21/03/2026

A spare KIM-1 keypad is even rarer than a KIM-1 itself. With this guide you can build a reasonable replica of the keypad. Thanks to the work of Eduardo Casino (the PCB) and Pete (peo2000 on forum64.org) I have published a DIY guide for a KIM-1 keypad replica. retro.hansotten.nl/6502-sbc/kim...

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