The subdirectory "bios" contains source code for 
CP/M 2.2 bios on the Heath H89.

prel.pas is a Turbo Pascal version of a program
that is used in constructing the binary image of
the boot tracks on a Heath H89 cp/m disk.
<br>
<P><I><A HREF=http://www.math.purdue.edu/~wilker/misc/cpm/prel.pas> Prel.pas </A></LI> </P>
<P><I><A HREF=http://www.math.purdue.edu/~wilker/misc/cpm/bios> BIOS </A></LI> </P>