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

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

PLEASE is a very small package for a standard KIM-1. It has a tiny monitor, command interpreter and many handy subroutines.

	PLEASE INSTRUCTIONS
	PLEASE LISTING

A small book with five experiments with the KIM-1.
1. User
2. Input/output
3. I/O controller
4. Timing
5. Hardware interrupts

KIM-1 experiments)

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.

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