🚀 go-pugleaf

In article <1992Nov16.154958.9682@unix.brighton.ac.uk>, rjb12@unix.brighton.ac.uk (Titch) writes:
> Does anyone know of a method to save the state of a PC (ie environment, 
> data, programs) - up to the 1MB boundary - so that, later, I can reload
> and things behave as if no interruption occurred.
> 
> Cheers,
> 
> Rich.

Hmmm.  Interesting idea.  I guess you are aware of laptops which does exactly
this at the press of a button, but i take it you want such a beast for
a normal table-top pc.

A program to save and restore the PC state will have to be run in protected
mode, that is, it will probably only work on 386s or better.  The code
will have to reside above the first megabyte, otherwise overlap conflicts 
will occur when restoring the memory image.

Also, the video state should be saved correctly.  Consider all those 
undocumented VGA modes and Super VGA modes...  you have to save all VGA
registers in addition to the VGA memory.  All BIOS variables and
the interrupt vectors should be saved, too...  ah well, just some
thoughts.

Let me know if you get any positive response on this.  Task-switching is
possible, as we can observe in DOS 5.0, so saving a task to disk and
restoring it another day should be possible
 
> Rich Browning (rjb12@bton.unix)   * The Intel Plentium: Ethernet controller  


Robert