{"product_id":"handwritten-engineering-notes-collection","title":"KIM-1 \u0026 Commodore 1541 \"Homebrew\" Interface Notes","description":"\u003cul\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"2,0,0\"\u003e\u003cb data-path-to-node=\"2,0,0\" data-index-in-node=\"0\"\u003eDescription:\u003c\/b\u003e A unique historical archive consisting of original, hand-rendered engineering notes for the \u003cb data-path-to-node=\"2,0,0\" data-index-in-node=\"105\"\u003eMOS Technology KIM-1\u003c\/b\u003e and the \u003cb data-path-to-node=\"2,0,0\" data-index-in-node=\"134\"\u003eCommodore 1541 Disk Drive\u003c\/b\u003e.\u003c\/p\u003e\n\u003cul data-path-to-node=\"2,0,1\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"2,0,1,0,0\"\u003e\u003cb data-path-to-node=\"2,0,1,0,0\" data-index-in-node=\"0\"\u003eKIM-1 Programming Guide:\u003c\/b\u003e 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.\"\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"2,0,1,1,0\"\u003e\u003cb data-path-to-node=\"2,0,1,1,0\" data-index-in-node=\"0\"\u003e1541 Disk Drive Interface:\u003c\/b\u003e 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.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"2,1,0\"\u003e\u003cb data-path-to-node=\"2,1,0\" data-index-in-node=\"0\"\u003eManufacturer:\u003c\/b\u003e Original engineering manuscript (Independent).\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"2,2,0\"\u003e\u003cb data-path-to-node=\"2,2,0\" data-index-in-node=\"0\"\u003eManufactured In:\u003c\/b\u003e Likely North America.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"2,3,0\"\u003e\u003cb data-path-to-node=\"2,3,0\" data-index-in-node=\"0\"\u003eCondition Description:\u003c\/b\u003e 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.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"2,4,0\"\u003e\u003cb data-path-to-node=\"2,4,0\" data-index-in-node=\"0\"\u003eTrue Condition:\u003c\/b\u003e See pictures for true condition.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"2,5,0\"\u003e\u003cb data-path-to-node=\"2,5,0\" data-index-in-node=\"0\"\u003eModel Number:\u003c\/b\u003e KIM-1 \/ Commodore 1541 Custom Interface.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"2,6,0\"\u003e\u003cb data-path-to-node=\"2,6,0\" data-index-in-node=\"0\"\u003eExtra Notes:\u003c\/b\u003e 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.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Thunder Bay Estate Sales","offers":[{"title":"Default Title","offer_id":45348797972671,"sku":"15c","price":79.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0519\/8639\/9423\/files\/15c-1.jpg?v=1773933876","url":"https:\/\/www.tbayes.ca\/products\/handwritten-engineering-notes-collection","provider":"Thunder Bay Estate Sales","version":"1.0","type":"link"}