IBM PC hacking

[Tony Duell]

> IIRC, a PS/2 model 25 and 30 also have BASIC in ROM.  And a PCjr most certainly 
> does (along with a full diagnostic program and "keyboard tutorial" -- the diags 
> were impressive for the time).

The problem with those diagnostics (and most built-in diagnostics) is 
that a fairly large part of the machine has to be operational (at least 
the CPU, some memory, ROM, video) for them to be at all useful.

-tony