A developer has created an x86 assembly project from the original printed IBM PCjr BIOS source code listing, enabling a byte-identical BIOS image to be built using period-appropriate assembler and linker tools running in DOS or DOSBox. The build process produces an executable converted to a BIN file via a Python script, which must then be split into two 32 kB ROM images to match the PCjr's hardware. The BIOS code remains under IBM copyright, so this is a preservation effort rather than an open-source release. The project helps keep the history of the short-lived PCjr alive.
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