The sixth issue of Optron covers the creation of the first Soviet ZX Spectrum clone in Lviv in 1984–1985 and details the initial ULA chip reverse-engineering. The technical section provides an analysis of NMI handling alongside a practical guide for building a 16KB Pseudo-ROM using 6264 ICs. Further hardware articles focus on floppy drive modifications, Miko-Best memory quirks, and shell updates for 48K Spectrum models. Completing the issue are local hardware and software classifieds, plus a continuation of Stephen King's story 'Night Shift'.
Issue contents:
- NMI / INT and others - The problems of c interrupts NMI.
- Lit. Page - Night Shift (continued).
- Letters from readers - SunLion about the newspaper. Pseudo-ROM.
- Advertising - Advertisements and announcements ...
- So who's first? - When and how did the first Domestic Spectrum? ..
- four kilobytes - Modernization of the shell.
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