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Full title Monitor
Year of release 1983
Publisher Jupiter Cantab
Producer / Author(s) Roy Nickson
Memory 3K
Type Game
Cost : £5.95
Download Monitor [CRC32 942074ED]
Distribution Permission Allowed | Group 2



Load the program by entering
load monitor
Run by entering

The computer asks you for an address (in hex). This is the current address, which the computer is currently looking at. You can list an address, which means that the address, the value of the byte there, and the corresponding ASCII character are printed out on one line. As a general rule, the current address is always updated to be the last one listed.

Under the monitor all words from the FORTH dictionary are available, including the following ones loaded with the monitor.

a (address) to enter a new current address (when the computer requests it, enter the new address).
p (previous) to move the current address back a specified number. Type the number in before p. as in the usual reverse Polish form.
n (next) to move the current address forward a specified number of bytes. Type the number in before n.
t (type) like n, but lists all the addresses between the current address and the new one.
z move the current address forward one and list it.
L (list) like a, but type in the new current address before L.
f (find) move the current address forward until a given character is found there, and then list the five addresses up to that place. Enter the character when asked.
x (exchange) change contents of the current address to a given byte, to be entered when the computer requests it.
in read numbers into memory, starting at the current address. Enter the numbers (all in one buffer-full) after you have entered in.
s display the stack.
d change number base to decimal (ten)
h change number base to hex (sixteen)
o change number base to octal (eight)
q quit the monitor

Screen shots

Tape Inlay

Cassette Body


Review: from Home Computing Weekly 12 July 1983

Jupiter Ace

Jupiter Cantab, Cheshunt Buildings, Bateman Street, Cambridge CB2 ILZ

A fairly standard utility program featuring the usual machine code facilities, with the useful options of reading the stack and using FORTH words interactive from within the monitor.
A buffer-full of bytes can be poked directly into nominated addresses, but there is no provision for reading the amount of memory left and the
monitor will cheerfully list the contents of non-existent memory addresses - try FFFF!
Hex, octal and decimal bases are available but the main display uses only half the screen and there is no automatic carriage return between successive inputs.
This produces a rather un-tidy display and provides less information than the Remsoft toolkit with which this monitor will inevitably be compared.

value for money