TMSI IDIOT/4 Monitor Summary

All inputs are echoed but ignored until one of the following commands is
typed. All numbers are in hexadecimal. Follow each command with a <CR>.
Backspace, Rubout, etc. aren't used. Spaces, Linefeeds, etc. can be used
freely except if they cause ambiguity. Only the last 4 digits of byte
counts and addresses are used; continue typing to correct errors.

?Maaaa nnnn <CR>        Examine Memory: Lists nnnn bytes of memory
                        starting at address aaaa. Each line begins with
                        the address, followed by up to 16 data bytes in
                        groups of 2. If more, the line ends with a
                        semicolon (;) and the listing continues on the
                        next line.

!Maaaa dd..dd; comment  Change Memory: Writes data byte pairs dd into
  aaaa dd..dd, comment  successive locations beginning at address aaaa.
       dd..dd <CR>      End the line with a semicolon (;) to continue
                        on the next line at a new address. End the line
                        with a comma (,) to continue on next line at the
                        next consecutive address. Comments after the ";"
                        or "," are ignored. Accepts ?M format.

?Maaaa nnnn !Mbbbb <CR> Move Memory: Moves a block of nnnn bytes of
                        memory from address aaaa to bbbb. Blocks can
                        be any size and can overlap without error.

?R                      Examine Registers: Lists 1802 registers as they
                        were saved in RAM at the time of entering the
                        monitor. Format is same as $M. Contents can be
                        altered using !M to change the memory image,
                        then $R to restore them. Example:
        ?R <CR)
        10B8 (ID,T) (DF,D) (IE,Q) (EF1-4)
        10C0 (R0) (R1) (R2) (R3) (R4) (R5) (R6) (R7);
        10D0 (R8) (R9) (RA) (RB) (RC) (RD) (RE) (RF)
        *

$R <CR>                 Run Registers: Restore 1802 registers to the
$Rp <CR>                values shown by the ?R command, and begin
$Rxp <CR>               execution with the specified values of X and P
                        (or 0 if not specified). Example: If entered
                        from BASIC, return with "$R23".

$Paaaa <CR>             Run Program: Begin program execution at address
                        aaaa with X=0, P=0, and interrupts disabled.
                        "$P0" is the same as a hardware reset.

Hardware Interrupt: If interrupts are enabled, a hardware interrupt
enters the monitor and T contains the old X and P. Return with $R(T).

Breakpoints (for programs in RAM): Replace 1 byte of program with SEP R1
(D1) using !M. When executed, D1 saves all registers in RAM except P and
X, and enters the monitor. To also save X and P, replace 2 bytes of
program with MARK, SEP R1 (79, D1). MARK saves X and P in T and M(R2),
and decrements R2.

To resume after a breakpoint, restore the original bytes replaced in the
program, adjust the program counter accordingly, and return with $Rxp.