This issue is focused on system development for the Micro Windows OS on ZX Spectrum, covering its architecture, memory mapping for versions 1.1 and 2.1, and practical applications of the system procedure library. Readers will find reviews of popular assemblers like GENS4D, PASM, and ZXASM, along with detailed guides on managing IM 0 and IM 2 interrupt modes. A separate technical article explains how to safely return from machine code to BASIC while restoring the stack and registers.
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