HP 82104A User guide

HEWLETT-PACKARD
82104 A
ARD READER
OWNER’'S HANDBOOK

Notice
Hewlett-Packard Company makes no express or implied war-
ranty with regard to the keystroke procedures and program
material offered or their merchantability or their fitness for
any particular purpose. The keystroke procedures and pro-
gram material are made available solely on an “as is” basis,
and the entire risk as to their quality and performance is with
the user. Should the keystroke procedures or program mate-
rial prove defective, the user (and not Hewlett-Packard Com-
pany nor any other party) shall bear the entire cost of all nec-
essary correction and all incidental or consequential damages.
Hewlett-Packard Company shall not be liable for any incidental
or consequential damages in connection with or arising out of
the furnishing, use, or performance of the keystroke proce-
dures or program material.

A caciano
HP 82104A Card Reader
Owner’s Handbook
March 1983
82104-90001 Rev. E
Printed in Singapore © Hewlett-Packard Company 1979

Contents
Section 1: Using the HP 82104A Card Reader ...................... 5
Battery Power ... .. . 5
Plugginginthe Card Reader ................................ 6
Removing the Card Reader ................................. 7
Section 2: Card Reader Operations ..............c.coivuuiennennn.n. 9
Magnetic Cards . ............. . 9
Protecting (Clipping) Cards .. ..., .. 10
Marking Cards . ............. i 11
Program Card Operations . .................coiiiiieeenooni.. 11
Writing a Program OntoaCard . ........................... 11
Writing Programs on Clipped (Protected) Cards ............. 13
Writing a Private Program Card . ........................... 13
Reading a Program FromaCard .......................... 14
Reading Subroutines ............ . ... ... ... ... 16
Reading Private Program Cards ......................... 18
Merging Programs ............. ... .. 19
Automatic Execution . ......... ... 20
Data Card Operations ................ccouiiiiiiiiaanannnni. 21
WritingDataOntoaCard ................................. 21
Writing Data Onto Clipped (Protected) Cards ................ 23
Reading Data From Cards .................. ... ........... 23
Status Card Operations . ..., . 26
Writing Status Cards .............. ... ... .. 26
Reading Status Cards . ................................... 27
“Write-All” Card Operations ............... ... 28
Writing All Information in the HP-41CtoCards .............. 28
Reading the “Write-All" Cards ............................. 29
Verifying Cards . ... 29
Executing Programs Containing Card Reader Functions ........ 31
Section 3: HP-67/HP-97 Compatability............................. 35
Reading HP-67/HP-97 Program Cards ....................... 35
Executing HP-67/HP-97 Card Programs .................... 36
Storage Register Compatibility . ............................ 37
Program Length ....... ... ... .. . 38
Reading HP-67/HP-97 DataCards .. ......................... 39
2

Compatibility Details . . ................... ... ... ...... ... 39
Compatibility Function List ........... ... ... ... ... .. .. 42
Appendix A: Accessories, Maintenance and Service........ 49
ACCESSONIES . . ... .. 49
Standard Accessories . .......... .. ... 49
Optional Accessories for the HP 82104A Card Reader . . . .. 49
Maintenance .. ....... ... ... ... 49
Card Reader Maintenance . ............................ 49
Limited One-Year Warranty . . ........... ... ... ............ 52
What We Will Do . ....... ... .. .. . ... .. .. .. ... ... ... 52
What Is Not Covered. . . ...... ... ... ... ... ... ......... 52
Warranty for Consumer Transactions
in the United Kingdom . ........ .. ... ... .. ....... ... 53
Obligation to Make Changes ........................... 53
Warranty Information . .......... ... ... . ... .. 53
Service . .. ... 54
Obtaining Repair Service in the United States .......... .. 54
Obtaining Repair Service in Europe. .. ........ ... ... ... .. 55
International Service Information ... ... ... .. ... ... ... ... .. 56
Service Repair Charge .......... ... ... .. ... ... ... ... 56
Service Warranty . ......... ... . ... ... ... ... 57
Shipping Instructions . .......... ... ... ... .. ... .. ...... 57
Further Information .. ... ... ... ... ... ... .. ... .. ... ... 57
Potential for Radio/Television Interference (for U.S.A. Only) ... 58
Technical Assistance ........... .. ... ... .. ... .. .. ... ..... 58
Dealer and Product Information . .......... .. ... ... .. ... .. 59
Appendix B: Messages and Errors......................... 60
Appendix C: Application Pac Compatibility ............... 63
HP 82104A Card Reader Function Index. . ................ 70
3/4

Section 1
Using the HP 82104A Card Reader
The HP 82104A Card Reader is a very powerful system addition for
the HP-41C or HP-41CV calculators. The card reader was
specifically designed to complement the calculator system, adding
virtually unlimited data and program storage capacity using small
magnetic cards.
Note: The HP-41C and HP-41CV differ only in their
initial Continuous Memory capacities. The term
“HP-41C"" is used throughout the rest of this
handbook, unless otherwise specified, to refer to both
calculators.
Even though there are significant differences between the HP-67/HP-97
calculators and the newer HP-41C, the HP 82104 A Card Reader enables
you to use nearly all current HP-67/HP-97 Application Pac Programs, as
well as most of the programs in the vast HP-67/HP-97 Hewlett-Packard
User’s Library.
So that you can take advantage of the advanced capabilities of the card
reader and make full use of the HP-41C system, take a few minutes to
work through this handbook. You will find using the card reader simple
and intuitive, but with substantial power.
Battery Power
The alkaline batteries in your HP-41C supply power to the HP 82104A
Card Reader. An automatic power checking system has been built into
the card reader to prevent it from operating when battery power is low. If
the LOW BAT display appears while you are operating the calculator/card
reader system, remove the card from the card reader and replace the
batteries in the HP-41C with fresh size N alkaline batteries. Refer to
Batteries in appendix B of the HP-41C Owner’s Handbook and Pro-
gramming Guide.
An AC adapter and rechargeable battery pack are available as
optional accessories for the HP-41C that can be used in
combination to operate the system from line power.
5

6 Using the HP 82104A Card Reader
Plugging in the Card Reader
1. Make sure the calculator is turned
off.
2. Remove the plug-in module or
port cap that is in port 4. (If you
remove a memory module, make
sure the HP-41C has enough
memory allocated to data storage
registers—executing [size] 064
will ensure this.) Refer to section
S or 7 in the HP-41C Owner’s
Handbook and Programming
Guide for more information about
(size].
3. Insert the card reader connector
into port number 4 as shown.
Press the card reader straight into
the calculator until it snaps firmly
into place.
Your HP-41C calculator and card reader system is now ready to use!

Using the HP 82104A Card Reader 7
Removing the Card Reader
1. Turn the HP-41C off!
2. Grasp the body of the card reader.
3. Press the tabs on either side of the
card reader as shown.
4. Pull the card reader straight back
until the connector is free from
port 4.
5. Replace the port cap on port 4.

Section 2
Card Reader Operations
Most of the capabilities of the card reader are available through
the use of small magnetic cards that store information in a greatly
condensed form. Information stored in the calculator can be
magnetically recorded on the small cards and then read back into
the calculator again at a later time. This gives you almost limitless
capacity for storing programs and data that you use in you
HP-41C* system.
The remaining card reader capabilities involve expanded software com-
patibility. With a few exceptions, all software that can be executed and
recorded on an HP-67 or HP-97 can be read into the HP-41C system
through the HP 82104 A Card Reader, and then executed by the HP-41C.
The HP 82104 A Card Reader actually contains a sophisticated translator
that changes operations on HP-67/HP-97 cards to special HP-41C-
compatible functions. All of the capabilities of the card reader are
available only when the card reader is plugged into the HP-41C.
Magnetic Cards
Depending upon the kind of information magnetically stored on cards,
they are placed in one of four categories: program cards, data cards,
status cards, and ‘‘write all’’ cards.
Each magnetic card has two sides or tracks. Each track on a card can
belong to one of these four categories. A card can hold up to 32 registers
of information, 16 registers on each track.
Magnetic Card
Track 1 ——
¢ . 4.:; a— Track 2
o
Sip A A A
View showing how information is stored on a card (not normally visible).
Upto e
16 register S / ll”_‘Illel.l‘:l.l'..lflm‘"-T:l“lul.l‘l\‘“h LT Up to
16 registers
* The HP-41C and HP-41CV model calculators differ only in their initial Continuous Memory
capacities. The term “HP-41C” is used throughout the rest of this manual to refer to both
calculators.
9

10 Card Reader Operations
Program Cards. A program card is one that has program instructions
stored on it. Each side of a card (track) can store up to 16 registers of
program instructions. So, if you had program memory of the basic
HP-41C completely full with program instructions, you could write all
of that information onto just two cards (four tracks). Each additional
memory module (64 registers) is equivalent to two more magnetic cards.
Data Cards. Data cards are simply cards that have data from the
HP-41C data storage registers written on them. As with program cards,
each card holds up to 32 registers (16 on each track).
Status Cards. Status cards have special status information written on
them. The information includes the status of flags O through 43 (which
includes display format and trigonometric mode); statistics register loca-
tions; number of data storage registers; key reassignments of standard
HP-41C functions and plug-in application module functions; and con-
tentsof X, Y,Z, T, LAST X, and ALPHA registers. The function
is used to write the status information on cards.
‘““Write-All’” Cards. ‘‘Write-All’’ cards are special cards that hold the
entire contents of the calculator. is used to write all information in
the calculator onto cards.
Protecting (Clipping) Cards
Information on any of the types of cards can be ‘‘protected’’ from
inadvertent clearing or re-recording. To protect a track of a recorded
card, clip the notched corner of the card at the beginning of the track you
wish to protect.
. 7~
Clip here to —» ,@ fl
protect track 1. ettt ¥ —Cllip here to
protect track 2.
Not here — you might lose some
of the information on the card.
When you have clipped a track of a card, you can read the information on
that card into the HP-41C any number of times, but you will not be able
to write any information onto that card unless you specifically instruct
the HP-41C to do so. You will learn more about this later.

Card Reader Operations 11
Marking Cards
So that you will not mix up your program and data cards, it is a good
idea to identify the contents of a card by marking the card. As you read
on in this handbook, you will see how marking cards is important and
how the different cards can be marked so they may be easily used and
cataloged.
Program Cards: Program name, subroutine names, version
number or date.
Data Cards: ‘‘Data,’’ program name, version number or
date.
Status Cards: *‘Status,’” program name, version number
or date, track number.
““Write-All’” Cards: *“WALL,’’ program name, version number
or date.
You can write on the face of a card using any writing implement that does
not emboss the card. Permanent ink marking pens (such as Schwan
Stabilo, Pilot Fine Point Permanent, Sanford Sharpie, and others),
pencils (0.5 mm lead for ‘‘film’’ using a 0.5 mm mechanical pencil
works well), and capillary pens using permanent ink for film (pens such
as Castell, or Koh-I-Noor) will work for marking on cards. Most of the
inks must be allowed to dry for a few seconds and pencil may smear.
Pencil, however, is erasable from the cards.
Program Card Operations
Even though programs that you key into the HP-41C are preserved by the
calculator’s Continuous Memory (even while the HP-41C is turned off),
you can conserve program memory and save a program permanently by
writing it onto a magnetic card using the card reader.
Writing a Program Onto a Card
Following is the procedure for writing a program onto a card.
1. Set the HP-41C to PRGM mode (press (prgm)).
2. Select a blank, unprotected (unclipped) magnetic card from the
packet of blank cards included with your HP 82104A Card
Reader.

12 Card Reader Operations
3. Set the HP-41C to the program you wish to write onto the card.
(Press @9 ] name (ALpHA J, supplying the name of
the desired program.)
4. Hold the card face up and
firmly insert track 1 of the card
as shown.
a. If the program is longer
than 16 registers (each
track on a card holds a
maximum of 16 registers),
the HP-41C prompts you
for the next track with
RDY kk OF nn
where kk is the number of
the next track to be written
and nn is the total number
of tracks required to write
the entire program to cards.
(Notice that when you be-
gin writing a program to
cards, the HP-41C knows
the total number of tracks
required for that program.)
Simply turn the card over
and insert track 2 into the
card reader as shown.
Pressing (R/S], (=), or turning the HP-41C off at this point
will terminate the operation. Pressing any other keys will only
cause the display to blink and the pressed function will not be
executed. TheRDY kk OF nnand CARD prompts will remain
active for 10 minutes, at which time the operation is termi-
nated.
5. The entire program, including current key assignments of labels in
that program, is now written on the magnetic card and also
remains loaded in the program memory of the calculator. The
contents of all data storage registers, the stack, and ALPHA
registers are unchanged.

Card Reader Operations 13
When you pass an unprotected but previously recorded card through the
card reader with the HP-41C set to PRGM mode, the previous contents of
the track are lost and are replaced by the new program instructions.
Any card-writing session may be terminated by pressing or (=
Writing Programs on Clipped (Protected) Cards
Clipping the corners off of program cards normally prevents them from
being used again for writing operations. Clipped cards can, however, be
read any number of times.
Attempting to write on a protected track (one with the corner clipped)
will result in a special message:
PROTECTED
The card will pass through the card reader and is not written. The display
will prompt for another card with RDY kk OF nn.
To write a program onto a protected track, simply set flag 14, the card
reader Overwrite Flag, before you begin the writing operation. The
Overwrite Flag remains set and allows you to write on protected tracks
until the program writing operation is completed or terminated.
Flag 14 is automatically cleared each time you turn the HP-41C on and
when any reading or writing operation is completed or terminated.
This procedure prevents you from accidentally destroying the informa-
tion on a card, but allows you to re-use cards after they have been
protected.
Writing a Private Program Card
The HP-41C and card reader can work together to provide a
security system that will prevent accidental alteration and
reproduction of important programs. Once a program is made
“private” on a card, it cannot be viewed, altered, or re-recorded
onto another card through normal operations.
To write a private program card:
1. Select a blank, unprotected (unclipped) card.
2. Position the HP-41C to the program you wish to make private.
(Press @8 (<] (aLpHa)name (aLpHa ], supplying the program
name.)

14 Card Reader Operations
3. Execute the (write private program) function (
WPRV (acpra])). The HP-41C will prompt you with
RDY kk OF nn
where kk is the next track number and nn is the total number of
tracks required to write the complete program to cards.
4. Insert track 1 as shown. If the
program is longer than 16
registers, the HP-41C will
prompt you for subsequent
tracks with ADY kk OF nn,
5. The entire program, including
program key reassignments, is
now written on the magnetic
cards and is made a private
card.
The private card may be read and executed any number of times, but
cannot be viewed or altered. In addition, you cannot write an already
private program to a new card. Any attempt to view (e.g., (SsT], (BsT)),
alter or record this program will result in the display of the PRIVATE
message. The function is not programmable, that is, cannot be
keyed in as part of a program.
Reading a Program From a Card
Once a program is written onto a card, it is a simple matter to read that
program back into the HP-41C’s program memory.
Here is one procedure for reading programs from magnetic cards:
1. Ensure that the HP-41C is not in PRGM mode.
2. Press @B (] (=] This positions the HP-41C after the last
program in program memory. The program that is read in will be
placed after the last program in program memory. If you do not
do this step, the program you read in will replace the last
program in program memory.

Card Reader Operations 15
Here is one procedure for reading programs from magnetic cards:
1. Ensure that the HP-41C is not in PRGM mode.
2. Press 8 () (] . This ensures that your last program
has an £/VD instruction and causes the program that is read
to be placed after your last program. (If the last program does
not have an £/VD instruction, it will be replaced by the new
program.)
3. a.
Insert track one of the program card. If the program is on more
than one track of a card, the HP-41C will prompt you for each
track with the standard prompt.
RDY kk OF nn
Insert the cards for the program until all of the tracks have been
read.
You can insert the cards for a program in any order you wish.
The HP-41C knows which tracks have been read and prompts
you for the lowest-numbered track not yet read. Regardless of
the order the cards are read, the program is placed in the proper
order in program memory.
. If you wish to use key assignments (of labels in the program)
that were written on the card, set the HP-41C to USER mode
before reading in the program. Key reassignments recorded
with the program are only active when the program on the
card is read and executed in USER mode. Only the key
reassignments of labels contained in the card program are
written onto and read from the card.
4. The program is now recorded into program memory and the
calculator is set to the top of the new program. The reassigned
keys can be used only when the program is read and executed in
USER mode.
Note: Programs that contain specific card reader functions
(e.g., (worax], [rsus]) must be executed with the card reader
plugged into the HP-41C. Those functions are contained in
the card reader, not the HP-41C. For all other programs, the
card reader need not be in place for proper program
execution.

16 Card Reader Operations
In the event that there is not enough room in program memory to hold the
entire program you are reading, the HP-41C displays the following:
NO ROOM (to let you know there was not enough room for the
entire program),
PACKING (to let you know it is packing program memory in an
attempt to find enough room),
TRY AGAIN (to let you know that you should try reading the card
again).
If you repeatedly get these messages after trying to read the card, you
will have to make room in program memory for the program by reallo-
cating registers, adding memory modules, or deleting instructions or
programs already in program memory.
Any program card-reading session may be terminated before all of the
tracks of a program have been read. Press or to terminate the
session. Program memory is left with the partially loaded program in
place.
Reading Subroutines
The (read subroutine) function is a programmable function
that causes the program on the card that is read to replace the last
program in program memory—all instructions between your last
END instruction and the permanent .£/V0. instruction. However, if
the last program in memory contains the executing function
(as an instruction in an executing program) or the calculator is
currently positioned to the last program (when is executed
from the display), the program that is read in is added after the last
program in program memory.

Card Reader Operations 17
—— Executed From the Keyboard
Program Memory
Program Card
: :J
The card program normally re-
places the last program in mem-
ory...
Last
Program
Program Memory
Program Card
: ;
...butwhen the HP-41C is currently
positioned to the last program in
program memory, the card pro-
gram is added after the last pro-
Last
Program
gram.
Program Memory
|RSUB| Executed in a Pr Ogramn ————
Program Card
f" )
En a s s
The card program normally re-
places the last program in mem-
ory...
Program Memory
Program Card
L
...but when the is in the
last program in memory, the card
program is added after the last
program.

18 Card Reader Operations
When vou execute the function, either in a program or from the
keyboard, the HP-41C prompts you for the card with
CARD
If more than a single track is required to read the complete program, the
HP-41C prompts for each subsequent track with the standard prompt.
RDY kk OF nn
Again, you can insert the tracks in any order and the HP-41C will always
prompt you for the lowest numbered track not yet read.
Program Operation. When executed by a program, the simply
halts program execution, prompts for the cards, and when the read
session is complete, execution resumes with the line following the [rsue).
You can construct ALPHA prompts in your programs that appear in the
display instead of the initial CARD prompt. Here is an example:
01 LBL ABC
02TINSERT CARD
03 AVIEW
04 RSUB
The display will show |NSERT CARD instead of the standard prompt
when the is executed. After the first track of the card is read, all
subsequent tracks read are prompted by the RDY kk OF nn message.
Reading Private Program Cards
The procedure for writing private program cards is given on page
13. Once a program is written to a card using (wPrv], that program
cannot be viewed, altered or re-recorded onto another card through
normal operations.
To read a private program card, simply set the HP-41C to normal or
USER mode, press g (*J (] and insert the card. The HP-41C
prompts you for additional tracks when required just like with non-
private program cards.