e.g. https://archive.org/details/bitsavers_ibmpcpc602renceAug81_17295874/page/n189/mode/2up https://archive.org/details/bitsavers_ibmpcpc602renceAug81_1... htt

e.g. https://archive.org/details/bitsavers_ibmpcpc602renceAug81_17295874/page/n189/mode/2up https://archive.org/details/bitsavers_ibmpcpc602renceAug81_1... https://sites.google.com/site/pcdosretro/ibmpcbios https://sites.google.com/site/pcdosretro/ibmpcbios has the source code for various models typed.