Commodore 1581 - Memory-Write Command

Here's a more general purpose program that reads one or more
locations anywhere in disk memory:
110 OPEN15,8,15
120 INPUT"# OF BYTES TO READ (0 = END)";NL
130 IF NL<1 THEN CLOSE 15:END
140 IF NL>255 THEN 120
150 INPUT'STARTING AT ADDRESS";AD
160 AH = INT(AD/256)AL=AD-AH*256
170 PRINT#15,"M-R"CHR$(AL)CHR$(AH)
CHR$(NL)
180 FOR 1=1 TO NL
190 GET#15A$:IF A$ = "" THEN A$ = CHR$(0)
200 PRINT ASC(A$);
210 NEXT I
220 PRINT
230 GOTO 120
Open command channel.
Enter number of bytes want
ed
unless done,
or way out of line.
Enter starting address.
Convert it into disk form.
Actual Memory-Read.
Loop until have all the data,
printing it as we go,
forever.
MEMORY-WRITE
The MEMORY-WRITE command is the equivalent of the BASIC
Poke command, but has its effect in disk memory instead of within the
computer. M-W allows you to write up to 35 bytes at a time into disk
memory. The MEMORY-EXECUTE and some User commands can be
used to run any programs written this way.
FORMAT FOR THE MEMORY-WRITE COMMAND:
PRINT#15,"M-W"CHR$(<address)CHR$(>address)CHR$
(# of bytes)CHR$(data byte(s))
where "<address" is the low order part, and ">address" is the high or
der part of the address in disk memory to begin writing, "# of bytes" is
the number of memory locations that will be written (from 1-35), and
"data byte" is 1 or more byte values to be written into disk memory,
each as a CHR$() value.
EXAMPLES:
We can use this line to turn off the "bumps" when loading DOS-pro
tected programs (i.e., programs that have been protected against being
copied by creating and checking for specific disk errors).
PRINT#15,"M-W"CHR$(48)CHR$(0)CHR$(1)CHR$(133)
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