Every computer should have a machine language monitor
in ROM. at least on
a par with DEBUG.
I would agree... On the other hand every version of Forth worthy of the
name ahs the words ! and @, and often related words like C! and C@ (the
HP71 versionn has N! and N@ to access individualt nybbles too(). So it's
easy enough to write a machien code monitor in Forth.
Even most ROM BASICs count, in tha they have PEEK and POKE (and related
commends to accesss I/O ports on appropriate machines). The ROM BASIC In
my IBM machines saved me a lot of time when I had a disk controller
fault. The machine couldn't boot of course, but I could send values ot
the controller I/O ports from the ROM BASIC and trace the signals on the
PCB wit ha logic probe. I am not sure how you do it with no porgramming
lanaugage available (and no front panel, for the pedants).
-tony