This is a reconstruction of the original 1981-82 IBM PC BIOS source code using scanning and transcription of the BIOS listings found in the IBM Technical Reference manuals.
All 3 versions of the IBM PC BIOS were built using Intel ASM86 on an Intel development system. In each case the BIOS source code is a single large file and the BIOS code is 8KB which resides at F000:E000