Display s... of the CPU registers,
Continue operation-of a routine after a Breakpoint.
Return to Basic.

H.x dump to Printer.

Text entry.

Disassemble any area of memory into Z80 mnemonics
either to the screen, or to both the screen and the ZX
Printer. j

N — Number conversion, Hex to Decimal or Decimal to Hex,

NGU<OJ

Al command codes are accessed by a single keystroke denoted by
the letter in the left hand column above. "All keyboard entries are
checked for validity., and at any given time, only the permitted
keyboard entries are accepted by the MONITOR; any other key
press is rejected and the keyboard is scanned again,

All numeric inputs and displays are in Hex to facilitate the entry of
the Z80 Op. Codes. The number conversion routine simplifies
access to Hex addresses.

PLEASE NOTE RANE v

All references to addresses and their contents in these instructions
will be in Hex, and will be shown as a two or four figure number,
without the suffix 'H',

Each command will now be dealt with in detail, with examples, to

clarify its operation.

M — Display contents of memory location

The screen should still only show the prompt and cursor in the
bottom left corner.

Type M

An inverse M (blue letter on a white sguare) wili appear immediately
to the right of the prompt, and the cursor will move along the
bottom line by one character space.

Now type in the Hex value of the address that you wish to inspect,
say 6000. (You can use the MONITOR to inspect or change any
memory location in RAM or ROM, although you cannot alter the
ROM values.) The address appears on the screen as you type itin,

"o. . č Č 5

d ss soon as you have typed the fourth digit, a two character Hex
"um ber appears on the sereen to the right of the address, showing
the Hex value of the contents of that memory location,

MIEIL000 00 -

The cursor has now moved on, leaving a space after the two
contents digits. žini
Now type FF. ;

t
H

/
EIEGO0O 00 FF -

This has loaded the Hex value FF into memory iocation 6000. The
value is loaded into the location automatically after you type the
second digit,

Now type ENTER.

KIALO0O OO FF
6001 00 —

The original line with the prompt has serolled Up one line, and
6001 00 is now displayed on the bottom line. Atall times, the

MONITOR operates with a scrolling screen, and new information is
always displayed on the bottom line.

Typing ENTER displays the next memory location and its contents,
To enter a value in this new address, enter the two Hex digits, or
type ENTER again for the next memory location.

Now let's check that FF really has been loaded into address 6000.
Type M

MEL00O 00 FF -
6001 00 s
u- ; i

The screen has scrolled up one line, and the inverse M has
reappeared on the bottom line.

Typing M after a Hex address, data entry, or ENTER, allows you to
re-enter the M command routine at the start. To re-enter the M

command in the middle of typing a Hex address, type X, to escape,
and M to enter the M command, :

Now type 6000