{"product_id":"synertek-sy6522-6522-via-versatile-interface-adapter-40-pin-dip-1981-6502","title":"Synertek SY6522 6522 VIA Versatile Interface Adapter 40-Pin DIP 1981 6502","description":"ITEM SPECIFICS\u003cbr\u003eBrand: Synertek\u003cbr\u003eMPN: SY6522\u003cbr\u003eSeries: 6500\u003cbr\u003eType: Versatile Interface Adapter (VIA)\u003cbr\u003eFunction: Peripheral I\/O Controller\u003cbr\u003eI\/O: Two 8-Bit Bidirectional Ports\u003cbr\u003eTimers: Two 16-Bit Interval Timers\u003cbr\u003eClock Speed Grade: 1 MHz (no-suffix version)\u003cbr\u003eSupply Voltage: Single +5 V\u003cbr\u003ePackage: 40-Pin Plastic DIP\u003cbr\u003eMounting Type: Through Hole\u003cbr\u003eAdditional Visible Markings: 3040\/128 (underside)\u003cbr\u003eDate Code: 8135 (1981, week 35)\u003cbr\u003eCountry of Manufacture: Singapore\u003cbr\u003eQuantity: 1\u003cbr\u003eCondition: New\u003cbr\u003e\u003cbr\u003eDESCRIPTION\u003cbr\u003eSynertek SY6522 Versatile Interface Adapter (VIA) in a 40-pin plastic dual in-line package. The photographed unit carries the Synertek logo with the SY6522 and 8135 markings, plus 3040\/128 and SINGAPORE on the underside. The top has light surface marks; see photos.\u003cbr\u003e\u003cbr\u003eFeatures:\u003cbr\u003eTwo 8-bit bidirectional I\/O ports.\u003cbr\u003eTwo 16-bit programmable interval timers.\u003cbr\u003eSerial shift register for parallel-to-serial and serial-to-parallel conversion.\u003cbr\u003eLatching on the I\/O port inputs.\u003cbr\u003eHandshake control lines for data transfers between the processor and peripherals.\u003cbr\u003eSingle +5 V supply.\u003cbr\u003e1 MHz speed grade.\u003cbr\u003e\u003cbr\u003eCompatibility:\u003cbr\u003eDirect replacement for SY6522 in 40-pin sockets designed for the 6522 VIA. Same 6522 VIA function as the MOS Technology 6522 and Rockwell R6522; match the speed grade to your system (the A-suffix versions are 2 MHz). Used with 6502-family microprocessors, including the Synertek SYM-1 and Commodore 1541 disk drive and VIC-20. The W65C22 is a later CMOS version; check electrical differences before substituting.\u003cbr\u003e\u003cbr\u003eQ\u0026amp;A:\u003cbr\u003eQ: What does the 6522 VIA do?\u003cbr\u003eA: It is an I\/O controller for 6502-family systems, with two 8-bit ports, two 16-bit timers, and a serial shift register.\u003cbr\u003e\u003cbr\u003eQ: What is the difference between the SY6522 and SY6522A?\u003cbr\u003eA: The SY6522 is the 1 MHz version. The SY6522A is the 2 MHz version.\u003cbr\u003e\u003cbr\u003eQ: Will this work in a Commodore 1541 or VIC-20?\u003cbr\u003eA: Those machines use the 6522 VIA. Confirm your board's clock speed matches the 1 MHz rating.\u003cbr\u003e\u003cbr\u003eQ: What does 8135 mean?\u003cbr\u003eA: 8135 is the date code (1981, week 35).\u003cbr\u003e\u003cbr\u003eTroubleshooting:\u003cbr\u003eConfirm +5 V at VCC and ground at VSS (pin 1).\u003cbr\u003eCheck that the system clock does not exceed 1 MHz for this version.\u003cbr\u003eVerify chip select and register select lines are decoding correctly.\u003cbr\u003eCheck that the reset line releases after power-up.\u003cbr\u003e\u003cbr\u003eDISCLAIMER\u003cbr\u003ePlease review all photos and specifications before purchasing, and make sure this part is right for your application. Item is sold as shown in the photos.\u003cbr\u003e\u003cbr\u003eLEGAL DISCLAIMER\u003cbr\u003eAmerican Industrial Parts Group is not an authorized distributor, reseller, or representative of Synertek. All product names, trademarks, brands, and logos are the property of their respective owners and are used for identification purposes only. As an independent reseller, the original manufacturer warranty does not apply.\u003cbr\u003e\u003cbr\u003eSY6522, Synertek SY6522, 6522, 6522 VIA, VIA 6522, 6522 VIA chip, MOS 6522 VIA, R6522, versatile interface adapter, 6502 peripheral IC, Commodore 1541 VIA, VIC-20 VIA, SYM-1 6522, 40-pin DIP IC, vintage Synertek IC 1981, 1541 drive not working replacement chip, vintage computer repair IC.\u003cbr\u003e\u003cbr\u003eThank you for shopping with American Industrial Parts Group!","brand":"Synertek","offers":[{"title":"Default Title","offer_id":50015594840219,"sku":"SYN-SY6522-N","price":12.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0767\/0857\/7435\/files\/synertek-sy6522-6522-via-interface-adapter-dip-40-1-american-industrial-parts-group.jpg?v=1793578169","url":"https:\/\/americanindustrialpartsgroup.com\/products\/synertek-sy6522-6522-via-versatile-interface-adapter-40-pin-dip-1981-6502","provider":"American Industrial Parts Group","version":"1.0","type":"link"}