Ohio Scientific Start Modes (was RE: PDP-11/44 boot prompt)

From: Bill Sudbrink <bill_at_chipware.com>
Date: Mon Nov 2 13:45:11 1998

D. Peschel wrote
> > Yup, every OSI machine I have dealt with powers on with:
> >
> > D/C/W/M ?
> >
> > and pressing the 'M' takes you to a neat little 6502 ROM
> > debug monitor.
>
> And D is for Diskette, I assume... is C for Cassette?
>
> W, of course, runs Windows. :) What does W really do?
>
> -- Derek
>

D - disk boot - Jumps to some fixed address where the disk bootstrap
                routine is known to be.

C - "cold" boot - Machine initializes all memory to power on values and
                  starts basic in ROM

W - "warm" boot - Machine performs minimal initialization to restart
                  basic in ROM. Attempts to leave memory (including
                  basic program store) in tact. Sort of a basic debug
                  mode. Example:
                  1) basic program hangs
                  2) hit reset button
                  3) warm boot
                  4) you can now do things like: LIST or even
                     better: PRINT X$

M - monitor - Runs monitor in ROM, again with minimal initialization

Bill Sudbrink
Received on Mon Nov 02 1998 - 13:45:11 GMT