Description: A unique historical archive consisting of original, hand-rendered engineering notes for the MOS Technology KIM-1 and the Commodore 1541 Disk Drive.

• KIM-1 Programming Guide: Hand-written on grid paper, these instructions detail the specific display layout (4-digit address / 2-digit data) and hex commands like [RS] (Reset) and [PC] (Program Counter). It includes a specific routine to "Run program at 1800H."

• 1541 Disk Drive Interface: A detailed, hand-drawn logic schematic on yellow paper titled "1541 Disk Drive Interface." This circuit diagram illustrates a custom "home-brew" interface using logic gates to connect a Commodore drive to a 6502-based system.

Manufacturer: Original engineering manuscript (Independent).

Manufactured In: Likely North America.

Condition Description: These are original vintage handwritten documents. The yellow and grid paper show age-appropriate tanning and minor handling wear. The ink and pencil drawings remain dark, sharp, and fully legible for study or framing.

True Condition: See pictures for true condition.

Model Number: KIM-1 / Commodore 1541 Custom Interface.

Extra Notes: These represent a rare "crossover" collectible. Documentation of users hacking Commodore peripherals onto earlier 6502 boards like the KIM-1 is a highly sought-after niche in the retro-computing community.