Creating new CP/M disk from scratch

[Roy J. Tellason]

On Saturday 03 June 2006 02:08 am, Chuck Guzis wrote:
> Now, for the tough part.  You need to write a CBIOS, which at a minimum,
> has your terminal I/O routines and disk I/O routines.  The terminal I/O is
> going to depend on what hardware you have.  The simplest is using a
> connection to a serial terminal.  More complex routines may be needed if
> what you have is a video-mapped display.  The disk routines aren't too bad.
>  One set of them simply passes the disk parameter block information to
> CP/M; the other entry points merely store the track and sector and unit
> and transfer address of what's to be read or written and then reads or
> writes it.    Part of the CBIOS is also the cold boot loader, which loads
> the DOS part of CP/M.  There are other useful features in the CBIOS, such
> as punch, printer, and reader I/O as well as IOBYTE redirection, but you
> can do those later.

This is the part I keep tripping over...

<...>

> Peruse the "CP/M System Alteration Guide" for examples of how to build a
> CBIOS and a boot loader.

Google came back with _one_ hit on that,  and it was just a reference in a 
bibliography,  with no link to the actual document.  Oh well...

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