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Software Usage and Examples
1
~:1[1
COP'''''
"ABC"
t:C$ TO
G:t.
2(1(1 PUF.:GE
II
DEF
II
t:C$
If
C$=" : t'11" ,
an HP-IL mass storage device named
t'11
will be used. If
[:$=" : >::t'1Et-1" ,
the electronic
disc will be used. If
C$="
II
(null string), main memory will be used. Once this change has been made
throughout the program, the file's location can be changed globally within the program by just changing
the line where the string assignment occurs.
If a program is using text or data files, the only code that needs to change is that where the files are
opened. For example, to open a file in main memory:
becomes
Subsequent
PEAD #, PP I t·n #,
and
F.:E::nOPE
*t.
statements will read from, write to, and move the
data pointer within file
::<' ' ' ' ' Z
on the electronic disc. Again, set a string variable to either the null string
or :
::·::t'1Et'1,
and change file references to append the string variable (e.g.,
A::;::;
I
Gt·~
#
1
TO
II
>:: 1/ Z
II
:~.:C:$).
NOTE
If you have existing programs that were written on a stand-alone HP-75
(i. e., not installed in an HP 8271 8A), you will need to reenter certain
program lines for them to properly use the electronic disc.
For details
about this, see appendix C.
Initializing the Electronic Disc
The HP-75 and the electronic disc are initialized independently of each other, just as the HP-75 and an
HP-IL mass storage device are initialized independently. If the HP-75 is reset ([SHIFT] [CTL] [CLR]),
the electronic disc is not. Similarly, if the electronic disc is reset
(UH T I AL I ZE
": ::·::t'1Et'1"),
the
HP-75 is not.
The electronic disc can be reset to its default state by executing
I HIT I AL I ZE ": >::t'1Et'1".
This is the
only way for the user to erase the contents of the electronic disc. The electronic disc software resets the
disc automatically at three different times:
1) The HP-7 5 is turned on and the electronic disc has not previously been initialized.
2) The HP-7 5 is turned on and the electronic disc contents have been corrupted.
3) The electronic disc RAM is bad.
50
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•
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