System programmer's manual (``Das Systemhandbuch für den PC-1600´´, in German)
BibTeX entry
@book{DvO-PC1600-Systemhandbuch,
author = {Oheimb, David von},
title = {{Das Systemhandbuch f"\ur den PC-1600}},
year = 1987,
publisher = {Verlag Klaus Ditze, Weilerswist},
note = {ISBN 3-925641-08-4, out of print}
}