Command summary:
A - one line assembler - e.g. A 033A LDA #$10 <CR>
B - set break point
C - compare memory - e.g. C ssss eeee wwww compares start to end with w
D - disassemble (with bidirectional scrolling)
E - kill MICROMON and exit to BASIC
F - fill memory - e.g. F ssss eeee xx
G - go / run
H - hunt mem range for pattern -
    e.g. H ssss eeee 'READ - or H ssss eeee ww xx yy zz...
K - kill MICROMON and stay in TIM
L - load - use for disk only - use K followed by normal TIM L for cassette
M - mem dump with HEX and ascii
N - new locate a m/c program (complicated)
O - calc branch offset - e.g. O 033A 0350 <CR>
Q - quick trace - run from address until set breakpoint reached
R - register display / edit
S - save prog to disk - e.g. S"1:FAT GIT",08,033A,03FF -
    use K followed by normal TIM S for cassette
T - transfer memory - e.g. T ssss eeee dddd
W - walk code - single step
X - exit to basic leaving MICROMON enabled
Z - toggle character sets
$ - hex conversion to other bases - e.g. $5B00 <CR>
# - decimal to other bases
% - binary conversion
" - ascii conversion
+ - addition - e.g. + 2222 3333 <CR>
- - subtraction
& - checksum - e.g. & 033A 03FF <CR>