Key Functions | BASIC Commands | HP-IL Operations | Other HP-75C Resources | Feedback
[Last updated Thursday, 05-May-2016 09:23:00 PDT (Deleted E-mail addresses)]
Denotes information added to this page at the last update.
HP 75 Operations Summary| Key | Function |
| ATTN | Power on |
| SHIFT-ATTN | Power off |
| ATTN (with program running) | Break program |
| TIME | Display/Set time |
| APPT | Display/Edit appointments | EDIT | Command-line mode |
| Up-Arrow | Up one line in program or catalog listing |
| Down-Arrow | Down one line in program or catalog listing |
| Left-Arrow | One character left |
| Right-Arrow | One character right |
| I/R | Insert or Replace characters |
| FET | Retrieve (fetch) a given line of BASIC code for editing |
| DEL | Delete one character right |
| CLR | Clear command line |
| SHIFT+LOCK | Lock alpha keys in upper-case |
| LOCK | Turn off upper-case if shift-locked |
| CTL+any letter key | Generates a Greek letter or other symbol |
| Command | Function | Syntax | Invocation |
| @ | used as a command separator to put multiple commands on one line | for i=1 to 10 @ print i @ next i | N/A |
| ; | used in I/O statements to append data without linebreak | 10 print "hello "; 20 print "world" | N/A |
| assignio | assign names to connected HP-IL devices |
user input HP75C response
assignio 1 Device(s) on loop
Device #1 = ': ' | RTN |
| beep | make the speaker go "beep" from command line or program | beep; beep N (0<N<1650 step 10); 10 beep N | RTN |
| cat | catalog of saved programs | cat (shows last program edited); cat all (lists all stored programs) | RTN |
| copy | make a copy of a stored program | copy 'prog1' to 'prog2' | RTN |
| def fn | define a function (see also end def) | 10 def fnf(x)= 1/(1/x) 20 input x 30 print fnf(x) | used in programs |
| delete | delete a line or range of lines | delete 10; delete 10,100 | RTN |
| dim | set the dimensions of an array | dim a(5); dim a(5,5) | RTN (usually in programs) |
| disp | synonym for print | disp "hello "; @ print "world" | RTN (usually in programs) |
| edit | edit new or saved program in basic or text mode | edit 'program'; edit basic; edit text | RTN |
| end def | marks the end of a multiline function | 10 def fnq(a$) 20 input "what is your name? ";a$ 30 b$="Hi, ";a$ 40 end def 50 print fnq(a$ | used in programs |
| fetch | retrieve a specific line of BASIC code for editing (equivalent to the FET key) | given:
10 REM line 10 20 REM line 20 30 REM line 30 fetch 20 returns: 20 REM line 20 | RTN |
| goto x | jump to the specified line number | 10 print "hello " 20 goto 40 30 print "world" 40 print "there" | used in programs |
| hex$(x$) | returns the hex value of a string or sting variable | print hex$("A") returns 40, or 64 decimal | RTN (usually in programs) |
| input | get user-entered data | input a$ | RTN (usually in programs) |
| list | lists current program | list 10; list 10,100 | RTN |
| mem | return current amount of free memory | mem | RTN |
| output | ? | RTN | |
| display data on LCD (or send to HP-IL?) | print "hello"; print i; print a$ | RTN (usually in programs) | |
| printer is | Assign a previously named HP-IL device as the output device | printer is ':aa' | RTN |
| purge | erase program or appointment | purge 'program'; purge appt | RTN |
| put | ? | RTN | |
| rem | a comment in a program | 10 rem this line is a remark | RTN (usually in programs) |
| rename | rename a stored program | rename 'prog1' to 'prog2' | RTN |
| reset i/o | reset the HP-IL bus? | RUN | |
| rmd(x,y) | ? | ||
| run | run the current program | run; run 'program' | RTN |
| set | set the time and date | set (in time mode) | TIME mode |
| short | a data type? | ||
| time | returns the system time in seconds since midnight (to three decimal places) | time; 10 n=time | RTN |
| work | ? | RTN | |
| command | function | syntax | invocation |
My most profound thanks to Paolo Marri of Roma, Italy for giving me a couple of HP-IL hints. To wit:
My undying gratitude also to Michael Sperber, of Bubenreuth, Germany for sending me reprints of the Computerclub Deutschland Prisma newsletter, chock-full of HP BASIC program listings. Now, if I can just con one of my German-speaking coworkers into doing some translating for me... .
And there's no way to thank Mark Hardman enough: He sent me reprints of the actual HP-75 documentation!! Also a Yahtzee program he'd written 'way back when. (Mark's given me permission to put his sources on this page, but I'll have to free up some space first.)
To Alex Knight, who happened to have an offline copy of this page lying around when I inadvertantly trashed it: Thanks buddy, you really saved me!
Here's some basic information on the HP-IL interface. (From The HP-IL System: An Introductory Guide to the Hewlett-Packard Interface Loop, by Gerry Kane, Steve Harper, and David Ushijima, OSBORNE/McGraw-Hill, 1982.)