{"product_id":"8237a-5-p","title":"8237A-5 P","description":"\u003cdiv class=\"communicaintro\"\u003e\u003cspan\u003e4-Channel Programmable Direct Memory\u003c\/span\u003e\u003c\/div\u003e\u003cdiv class=\"communicadesc\"\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003cdiv\u003e\u003cul\u003e\r\n\u003cli\u003e\n\u003cstrong\u003e4 Independent Channels:\u003c\/strong\u003e Each channel can be individually programmed and has a 64K address and word count capability.\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eTransfer Modes:\u003c\/strong\u003e\r\n\u003cul\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eSingle Transfer:\u003c\/strong\u003e Releases the bus after every byte.\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eBlock Transfer:\u003c\/strong\u003e Moves the entire data block in one go.\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eDemand Transfer:\u003c\/strong\u003e Continues transferring as long as the external device requests it.\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eCascade:\u003c\/strong\u003e Allows multiple 8237A chips to be \"daisy-chained\" to increase the number of channels (e.g., how the IBM PC used two 8237s to get 7 channels).\u003c\/li\u003e\r\n\u003c\/ul\u003e\r\n\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eMemory-to-Memory Transfer:\u003c\/strong\u003e It can move data from one memory location to another, a feature not found in many other DMA controllers of its era.\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eAuto-Initialization:\u003c\/strong\u003e Allows a channel to automatically re-load its original starting address and word count after a transfer finishes (useful for repetitive tasks like CRT refreshing).\u003c\/li\u003e\r\n\u003c\/ul\u003e\u003c\/div\u003e\n\u003ch2\u003eAdditional Information\u003c\/h2\u003e\n\u003cdiv\u003e\u003ctable border=\"1\" cellpadding=\"7\"\u003e\u003ctbody\u003e\u003ctr\u003e\n\u003ctd\u003eDevice\u003c\/td\u003e\n\u003ctd\u003eProgrammable Memory\u003c\/td\u003e\n\u003c\/tr\u003e\u003c\/tbody\u003e\u003c\/table\u003e\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Communica","offers":[{"title":"Default Title","offer_id":45624682283052,"sku":"8237A-5 P","price":16.5,"currency_code":"AED","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0300\/5376\/1068\/files\/8237a-5-p-7102544.jpg?v=1781108695","url":"https:\/\/xytron.ae\/de\/products\/8237a-5-p","provider":"Xytron","version":"1.0","type":"link"}