HELPFUL Zapp is a fairly complete machine code utility for the Amstrad 464 from Hewson Consultants. As such it doesn't supnsingly enough have that much to compete with. Nevertheless it's excellent, combining disassember, high speed one pass assembler, single and multi step monitor, hex memory editor, file manager and text editor -more or less everything you could want. You can enter the code like lines of Basic with full error checking for syntax and editor, then step through the completed listing command by command to see how it works. Zapp doesn't teach you Z80 machine code - it refers you to Rodney Zack's book for that. The manual is clear and helpful, covering the main functions of the program and including a useful quick summary. It's not cheap, but the price is justified. Popular Computing Weekly 85-04-25
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