Q: Why do you need to emulate a ROM chip anyway?Ī: Like most 8-bit computers, the keyboard interface eventually talks directly to the memory bus. Python code that can respond to an Output Enable signal.KiCad files for the ROM Interposer Board.How hard could it be to replace that dual-chip setup with a microcontroller to emulate another kind of keyboard? Bald Engineer tries using an Arduino Mega 2560, Teensy 4.0, and a Pi Pico to replace a vintage ROM chip. The Apple IIe uses a custom microcontroller and ROM chip to put ASCII values into the computer’s memory.
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