They asked all current New York contributors to help with the review. In 1984, PC Magazine decided to do a review of printers. This was the beginning of Petzold's career as a paid writer. This was submitted to PC Magazine for which they paid $800. This debt encouraged him to use the PC to earn some revenue so he wrote an article about ANSI.SYS and the PROMPT command. Petzold purchased a two-diskette IBM PC in 1984 for $5,000. This experience of digital circuitry and assembly language programming formed the basis of his book Code: The Hidden Language of Computer Hardware and Software. In 1979, Petzold started building a computer-controlled digital electronic music synthesizer based on the Zilog Z80 microprocessor. He had an interest in electronic music and in 1977 started building electronic music instruments out of CMOS chips. Aside from writing books about Windows programming he has contributed to various magazines about computers. He graduated with a Master of Science in Mathematics from Stevens Institute of Technology in 1975. He is also a Microsoft Most Valuable Professional and was named one of Microsoft's seven Windows Pioneers. Charles Petzold (born February 2, 1953) is an American programmer and technical author on Microsoft Windows applications.
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