Humberto Costa built the HC SDK, a NASM-inspired assembler SDK for retro 8-bit computing, after finding that existing Z80 assemblers lacked NASM-style Intel syntax support. The project targets the 8080, 8085, 8086, and Z80 processors, with 6502 support in progress. It runs on macOS, Windows, Linux, OpenBSD, and FreeBSD, and is
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