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<title> OS/A65 Machine Language Monitor </title>
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<p><h1 align=center> OS/A65 Machine Language Monitor </h1></p>
<p> <h2 align=center> (c) 1989-98 Andre Fachat </h2></p>
<hr><p>
This machine language monitor owns the most standard commands together
with some interesting features taken from my C64
<a href="../c64/assembler/">assembler</a> and some commands to
do system calls easier.<br>
All addresses and data bytes can be given in hex, decimal (with
preceding "."), octal (with preceding "&") or in binary (with
preceding "%"). The output of the commands M, B, R, D, G and C can
be piped to a file with "> filename", like in the shell.
<p>
<pre>
X exits monitor (goes to shell)
D a b disassemble from address a to b
B a b binary list
M a b hex dump
R shows register contents
; a mnem
A a mnem assembles 6502 mnemonic to address a
+ pc ac xr yr sp sr
sets registers to a new value. a "-" instead of a
value leaves the register unchanged
E a b exchanges environment block a (the a'th MMU register) with
with memory block b
S "name" a b save memory from a (included) to b (not included)
in file "name". The first two bytes in the file are the
memory address
G a Goto address (executes a JSR)
L a b reads b bytes from STDIN and saves them at address a
L "name" a Load file "name" to address a or the included load
address if a is left out
C a b c Compare memory area from a to b with the area starting at c
T a b c Transfer (copy) memory from a to b to the address c
O a b c Occupy (fill) memory from a to b with c
P a b c sets system parameter: a becomes the standard drive (for
load/save), b is the number of bytes printed in a line
with hex dump and c becomes the number of available
memory blocks (a 4kByte) for this task. A "-" leaves the
value unchanged.
U a b c d e change in the memory area from a to b all three byte
assembler opcode addresses pointing to the area between
c and d to the area starting at e
I a b c ...
, a b c ... writes bytes b, c, ... into the memory at address a
F a b string tries to Find the string (which is mixed from bytes,
separated by spaces and strings, enclosed in double quotes)
in the address area from a to b
FA a b addressing
search all assembler codes in memory from a to b, that have
the given addressing mode: "FA a b (**AB)" means to search
all absolute indirect addressing modes with low byte
equal to $AB
FR a b search for relative jumps
F- a b c search in memory from a to b for bytes that are not equal to c
YD a b c DEVCMD with device a, command b and parameter c
YM GETMEM
YF a FREMEM memory block a
YS GETSTR
YR a FRESTR stream a
YE GETENV
YP adr env stdin stdout stderr
FORK
YW sem PSEM
YV sem VSEM
YG a tries to get memory block a with GETBLK
YC d:mask show directory
</pre>
<h4>Memory Map</h4>
The shell and the monitor both use the zeropage addresses
from 64-128 ($40-$80) and memory addresses from 768-1024 ($300-$400).
In addition to this, of course the stack ($0100-$01ff) and the PCBUF
Send buffer ($0200-$02ff) are being used.
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