Embedded Systems September 2000 Vol13_10

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SEPTEMBER 2000 50 . . .... ~~~ยท New Twists on the Z80 Despite being a quarter-century old, the 8-bit Z80 and its derivatives continue to be popular with embedded system designers. With two new derivatives emerging within the last year, it's a good time to take a fresh look at the architecture. This article consicU;!rs the architectural choices from the perspective of an RTOS implementer or user . BY JEAN LABROSSE Sequence Enumeration Sequence enumeration is a technique for analyzing systems. It can be used to turn a complex set of requirements into an easily implemented state machine. BY ROB OSHANA COVER Will the open source movement prove to be profitable, or will you end up getting short-changed? Cover illustration by Rupert Adley. 146 128 Doing Hartley Smartly Think the fast Fourier transform is fast enough? Think again. Meet the fast Hartley transform. BY ROBERT SCOTT Get by Without an RTOS Too many simple systems use a commercial RTOS. All that 's sometimes needed is a way to implement event-driven and periodic functions. Here's an easy way to do just that. BY MICHAEL MELKONIAN 166 Configuration Management Tips Whether you're just getting started with version control techniques or an old pro, this article has some good suggestions for you to improve your overal l plan. BY ALLAN FOLZ

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