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title: "Understanding Your ZX81 ROM"
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published_at: "2020-10-27T17:18:52+00:00"
modified_at: "2024-06-23T01:04:51+00:00"
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excerpt: "SYNC readers will recognize Dr. Logan as a major ZX80/81 expert whose writings are well worthwhile. Understanding Your ZX81 ROM is no exception. The book is written for a serious beginner who has a fairly good knowledge of Basic and wishes to take advantage of Z80 machine code execution speed. It supplements, but does not…"
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pubdate: "July/August 1982"
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---

# Understanding Your ZX81 ROM

SYNC readers will recognize Dr. Logan as a major ZX80/81 expert whose writings are well worthwhile. Understanding Your ZX81 ROM is no exception. The book is written for a serious beginner who has a fairly good knowledge of Basic and wishes to take advantage of Z80 machine code execution speed. It supplements, but does not replace, the ZX81 manual which must be used as a reference.