{"product_id":"24049","title":"MM504","description":"\u003cp\u003eDual 16-Bit Static Shift Register.Produced primarily during the late 1960s and 1970s, this integrated circuit (IC) was built on a single monolithic silicon chip using P-channel enhancement-mode MOS (Metal-Oxide-Semiconductor) transistor technology.Key Specifications \u0026amp; ArchitectureFunction: Dual 16-bit static register (containing two independent 16-bit shift registers on one chip).Technology: Low-threshold P-channel MOS.Operating Temperature Range: -25°C to +70°C (commercial grade).Note: The military-grade equivalent, rated for -55°C to +125°C, is designated as the MM404.Clocking: Designed to interface with sequential digital systems utilizing a two-phase clock system.Common ApplicationsIn early computing and digital engineering, the MM504 was utilized for:Data buffering and temporary digital storage.Sequential logic circuits and time-delay generation.Early digital data correlation systems. 1970s Electronic Desktop CalculatorsBefore single-chip microprocessors became cheap and dominant, calculators processed math serially (one digit or bit at a time).The Product: High-end programmable or scientific desktop calculators from manufacturers like Friden, Monroe, Anita, and Singer.Role of the MM504: The chip served as the primary Arithmetic Register Memory (storing the Accumulator register and the Entry register). Because it is a Dual 16-bit register, one single MM504 chip could store two separate 16-digit Binary Coded Decimal (BCD) numbers or status flags while the calculator executed long-division or multiplication algorithms.The Circuit Setup: The input lines tied directly to an adder\/subtractor circuit, looping the output back into the input of the MM504 through a multiplexer to continuously refresh or update the numbers on every clock cycle.2. Early Video Display Terminals (VDTs) \u0026amp; \"TV Typewriters\"In the early 1970s, RAM was incredibly expensive. Early computer terminals used shift registers to hold text data for screen refreshing.The Product: Early data terminals, serial character receivers, and DIY computer kits like the famous Don Lancaster TV Typewriter or early Southwest Technical Products Corp (SWTPC) terminals.Role of the MM504: It acted as a Line Buffer Memory. As characters were typed or received via a serial line, they were shifted into the MM504. The 16-bit capacity perfectly held short segments of data or configuration data (like tab stops or cursor horizontal coordinates) before being fed into a character generator ROM to be drawn onto a CRT television screen.3. Electronic Musical Organs (Digital Synthesis)The Product: Early digital and hybrid electronic church\/home organs (such as early digital models by Allen Organ Company or Baldwin).Role of the MM504: The shift registers were configured as digital delay lines or multiplexed key-assignment buffers. When you pressed keys on the keyboard, the state of the keys was scanned sequentially and stored in the shift register to distribute pitch data to the tone generation circuits.\u003c\/p\u003e","brand":"NATIONAL","offers":[{"title":"Default Title","offer_id":24052596146240,"sku":"","price":50.27,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0219\/7936\/5440\/products\/ACtC-3ffA9gP-4XktekPz7dnzIsvGPszLaouFfiatesTSDzcTtDPMYuESE52dSfV81H86nbwbFIVeDzvdGDTgPRkGc-KAm6NfJi1K805Zk2hwDFHoj47Y6U8Tp-ytmU6HRZHY863Ek3Cgd2olajFyHtOthCDYg_w920-h617-no_71a2cd35-1b5d-42e6-9e9d-9b3b8c16c5a8.png?v=1614908357","url":"https:\/\/greenbrookonline.com\/products\/24049","provider":"Green Brook Online","version":"1.0","type":"link"}