Preserving the Roots of Personal Computing

The Unitron Apple II clone, known initially as the Unitron AP II, was introduced in Brazil around 1982. Developed by Unitron Eletrônica during a period of restricted computer imports, it served as a domestic alternative to the Apple II, offering near-complete hardware and software compatibility. It used a MOS Technology 6502A processor running at 1 MHz, and typically came with 64 KB of RAM, expandable through internal slots. The machine supported standard Apple II video modes and sound output, included…

The Synertek SYM-1, introduced in 1978, was a single-board computer designed as a successor and improvement to the popular KIM-1. Developed by Synertek Systems in California, the SYM-1 was built around the 6502 processor running at 1 MHz, accompanied by 1 KB of onboard RAM and 4 KB of ROM containing the SuperMon monitor program. The system provided a solid entry point for hobbyists, educators, and developers looking to explore or prototype with the 6502 architecture. The board featured a 28-key hexadecimal keypad…