David JONESCool, so. It turns out YOU can create your own copy of the BIOS ROM for the IBM Enhanced Graphics Adapter (EGA) using the zip on this archive.org upload https://archive.org/details/6277356-ega-bios-source/
It contains the listings (from the IBM EGA manual i suppose, which included them), and shell scripts to compile them. The script runs on Unix and uses the `emu2` program to run the text-mode DOS programs (MASM.EXE and LINK.EXE which are included in the zip). I had to clone and compile emu2 myself (just like the good old days).
