the basic *RAS, *CAS, *WRITE and multiplexed address bus concept was retained intact. World leader in telecommunications products Mostek enjoyed many years of mastery of the international market for telecommunications products. Their product line included telephone tone and pulse dialers, touchtone decoders, counters, top-octave generators (used by Hammond, Baldwin, and others), CODECs, watch circuits, and a host of custom products for a variety of customers. The products used the simple aluminum-gate PMOS (& later aluminum-gate CMOS) process and helped maintain Mostek's cash flow through intense DRAM competition, and other semiconductor market pressures. In 1975 a smoky fire in the wafer fab fire closed it for several months and production of some critical products was shifted to a friendly fab (Synertek) in Silicon Valley. Several employees played a key role in the Telecommunications and Industrial Products Department. Bob Paluck headed the department, assisted by Mike Callahan, Charles Johnson, William Bradley, Robert C. Jones, Bob Banks, Ted Lewis, Darin Kincaid, William Cummings, and a host of other employees. Lewis and Bradley were designated as key employees after the United Technologies purchase. Bradley designed all of the custom products based on the single-chip-calculator platform, as well as the code for the wristwatch chips produced by Mostek for Bulova and other customers. For a short while, Paluck headed a joint venture called Mostek Hong Kong, a collaboration with Bulova for the production of high-end wristwatches based on Mostek designs. Bradley was an employee of that joint venture. Paluck left Mostek to work with Sevin Rosen Funds and Convex Computer. As Mostek's focus was shifted to its DRAM products, the industrial and telecommunications products were ignored and their market share vanished. Microprocessor second sourcing deals With this foundation in calculator chips and high volume DRAM production, Mostek gained a reputation as a leading semiconductor "fabrication house" (fab) in the early 1970s. MK5065 In 1974 Mostek introduced the MK5065, an 8-bit PMOS microprocessor, with 51 instructions whose execution times range from 3 to 16 μs. Architectural features included multiple nested indirect addressing and three register sets (each consisting of an accumulator, a program counter and a carry/link bit) which could be used for interrupt processing or for subroutines. Bill Mensch was one of the engineers who had actually designed the 5065 at Motorola for Olivetti. MK3870 A more popular product was the MK3870, which combined the two-chip Fairchild F8 (3850 + 3851) into a single chip,