n 1975 MOS Technology started delivery of 65XX ICs. So 2025 marks the 50 year anniversary of the 6502!
The earliest mentions of the KIM-1 are from January 1976. The date of the first edition of the User Manual, and first mentions in e.g. Byte.
So I propose to declare January 2026 as the 50th birthday of the KIM-1!
#50yearsKIM1
Category Archives: 6502
How to use the time in the 6530/6532
When I acquired a KIM-1 Rev A, obviously sold by NCE/Compumart, it came with some documentation that may interest any programmer working with the MOS Technology (R)RIOT 6530 and 6532.
The timer description the datasheet is a bit vague about how to use. What may help is the document ‘KIM-1 Application Note 2 Interval Timer Operation’ by MOS Technology.
A document with listings of KIM-1 programs called ‘KIM-1 Application Programs CT1’ illustrate the usage of the timer in interrupt mode. You find the documents here:
Compumart KIM-1 Rev A – Retro Computing
See also:
KIM-1 connectors: beware the Chinese cheap variants!
Magazines: Compute! and Compute II
All documents in the MTU pages are now clean and higher quality, about 50 new PDFs.
Focal-65 V3D for TIM and KIM-1
PLEASE package The Computerist
PLEASE is a very small package for a standard KIM-1. It has a tiny monitor, command interpreter and many handy subroutines.
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PLEASE INSTRUCTIONS |
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PLEASE LISTING |
See also:
KIM-1 connectors: beware the Chinese cheap variants!
Magazines: Compute! and Compute II
All documents in the MTU pages are now clean and higher quality, about 50 new PDFs.
Focal-65 V3D for TIM and KIM-1
A small book with five experiments with the KIM-1
A small book with five experiments with the KIM-1.
1. User
2. Input/output
3. I/O controller
4. Timing
5. Hardware interrupts
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KIM-1 experiments) |
See also:
KIM-1 connectors: beware the Chinese cheap variants!
Magazines: Compute! and Compute II
All documents in the MTU pages are now clean and higher quality, about 50 new PDFs.
Focal-65 V3D for TIM and KIM-1
MOS Technology KIM-1 Preliminary datasheet 1976
With one of my KIM-1s (a Rev G) came a MOS Technology KIM-1 Preliminary datasheet 1976.
Added to the KIM-1 manuals page.
See also:
KIM-1 connectors: beware the Chinese cheap variants!
Magazines: Compute! and Compute II
All documents in the MTU pages are now clean and higher quality, about 50 new PDFs.
Focal-65 V3D for TIM and KIM-1
Facebook, not now
I am administrator of several Facebook groups. But not at the moment. So if you came here looking why I am absent on Facebook starting August 22, read this: I am well, my Facebook account is not.
I am not a fan of Meta and the way they treat privacy, so I do not post any personal info there anymore and unfriended nearly all.
Meta also started to target personal advertisement in a more aggressive way, even blocking access for a couple of seconds on the phone to force me to accept that.
I stopped therefore a long time ago posting personal information.
But these groups are retro computing related, with a nice atmosphere and many members, of which I am the administrator and a major contributor:
– KIM-1, SYM-1, AIM 65, Elektor Junior and clones (over 1000 members)
– 6502 CPU family (over 4000 members)
– The School of Wirth (a dozen members)
Out of the blue Facebook blocked my access on August 22, I have not obeyed their ‘community rules’. Must be because I link to my websites a lot. Facebook hates people going offsite!
At the moment I am not allowed back in, I have appealed and wait for Facebook. It could mean permanent blocking and the groups will suffer.
There are backup admins, so they may survive.
If I am permanently blocked, my regards and good wishes to all members of the groups I administer!
See also:
KIM-1 connectors: beware the Chinese cheap variants!
Magazines: Compute! and Compute II
All documents in the MTU pages are now clean and higher quality, about 50 new PDFs.
Focal-65 V3D for TIM and KIM-1

All documents in the MTU pages are now clean and higher quality, about 50 new PDFs.
I got hold a about 10 cm of MTU documents. Several I already had in PDF format, some not available yet.
I took the opportunity to scan/rescan/repair what I have online until now.
All documents in the MTU pages are now clean and higher quality, about 50 new PDFs.
Noteworthy are the new revised K-1008 September 1979 document and the now complete and revised K-1013 manuals and 2 versions of the CODOS V1 manual.
All the K-1002 documents, for KIM-1, SYM-1, AIM 65 and Commodore PET are new.
Micro Technology Unlimited – Retro ComputingMTU history: Hal Chamberlin
MTU Catalogs, Product Descriptions and Newsletters
MTU Application notes
MTU K-1000 power unit
MTU K-1002 Audio D/A Converter
MTU K-1005 Card File and Motherboard using KIM/MTU bus
MTU K-1007 PET MTU bus interface
MTU K-1008 Visable Memory
MTU K-1008 documents
Dave Plummer has a K-1008
The K-1008 and the KIM-1 Simulator
Graphics Software Package K-1008
K-1008 Test programs
K-1008-2L Patches to Microsoft BASIC
K-1008 Visable Memory Replica by Eduardo Casino
MTU K-1009-1C AIM 65 Printer Enhancement Package
K-1012 PROM expansion board
K-1013 floppy controller
MTU CODOS
MTU K-1016 16K RAM board
MTU K-1020 Prototyping board
MTU K-1032 Banker RAM ROM I/O
See also:
KIM-1 connectors: beware the Chinese cheap variants!
Magazines: Compute! and Compute II
Focal-65 V3D for TIM and KIM-1
John Bell Engineering catalogs
Compumart KIM-1 documents
When I acquired a KIM-1 Rev A it came with some documentation revealing its provenance:
Warranty card
Brochure showing the Rev A
A document with KIM-1 program called KIM-1 Application CT1
KIM-1 Application Note 2 Interval Timer Operation
See also:
KIM-1 connectors: beware the Chinese cheap variants!
Magazines: Compute! and Compute II
All documents in the MTU pages are now clean and higher quality, about 50 new PDFs.
Focal-65 V3D for TIM and KIM-1

Compumart KIM-1 Rev A
When I acquired a KIM-1 Rev A it came with some documentation revealing its provenance:
- Warranty card
- Brochure showing the Rev A
- A document with KIM-1 program called KIM-1 Application CT1
- KIM-1 Application Note 2 Interval Timer Operation
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KIM-1 Application Programs CT1 |
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KIM-1 Application Note 2 Interval Timer Operation |

My Rev A CPU week 15 1976
See also:
A 2K Symbolic Assembler for the KIM-1
The Rockwell KIM-1
KIM-1 PCB Edge connectors
Dungeons And Dragons Dice Simulator For The KIM-1
KIM-1 Revisions update
I have added images of my recently acquired KIM-1s to the KIM-1 Revisions Images page.
First version. I have a more time correct CPU (ceramic, pre June 1976) 6502 for this board. Needs a cleanup/restore also.

My KIM-1 first version
Rev A. Mostly original board, some small repairs.

My Rev A CPU week 15 1976
Rev G. A high quality unaltered KIM-1.

My second Rev F