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Peek-Poke and the TI-74?

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    Peek-Poke and the TI-74?

    Hi. I have a TI-74 Basicalc and I was wondering if there was any way to peek and poke on the TI-74?

    I have the manuals but can't find anything about peeks and pokes. I've tried peeking and poking but to no avail. I have a functioning TI-74 but I don't have a cassette interface. I do have an 8K Ram module.

    Thanks for any help or infomation.

    There is an article out there that compares the TI-74 to the previous TI CC-40:

    In that article, the author states:

    -- There is no direct access to assembly language except for
    CALL IO on the TI-74.  Therefore the following CALL's of
    CC40 BASIC are not available on the TI-74; GETMEM POKE PEEK
    So, I guess there's your answer. Apparently no PEEK & POKE in the TI-74.



      That's a shame. Thank you smp for the reply and information.


        I'm not a programmer or computer expert, just a hobbyist. If there are no peek or pokes available in TI-74 Basic, does anybody know of another way to "peek" and "poke" things in and out of memory?

        Edited to add:

        Did the factory have any external code or way to test or check out the TI-74 from the keyboard?
        Last edited by thumbs; February 4, 2018, 12:16 PM.


          Hi fellows -

          PEEK, POKE, & EXEC are available as callable sub-routines.


            Thank you for the reply, JDardner.

            How would I go about doing that on the TI-74?

            When I: Call Peek(256) or Call poke(256,1) I get an 'E13 Not found' error. If I: peek(256) or poke(256,1) I get an 'E17 Not defined' error.

            An guidance or help would be greatly appreciated.


              Originally posted by JGardner View Post
              Hi fellows -

              PEEK, POKE, & EXEC are available as callable sub-routines.
              You made me doubt myself (see my earlier post) so I got out my 74 and tried them. Nope, not available. Just to be certain, I scoured the Programming Reference Manual. Nope, nothing listed for PEEK, POKE, or EXEC.

              Why do you make that statement?



                Thank you JGardner for the reply.

                How would I go about doing that on the TI-74?

                When I: Call peek(256) or Call poke(256,1) I get an 'E13 Not found' error. If I: peek(256) or poke(256,1) I get an 'E17 Not defined' error.

                Any help or guidance would be greatly appreciated.


                  Hi gents. Sorry about the delay - I'm enjoying the flu at the moment.

                  The missing CC40 subs are available in the software package included

                  with the PC-IF, & separately here:


                  You need a PC-IF to install the software on the '74 - So far. The PC-IF

                  manual has the details, available here:



                  Connecting a PC-IF to a modern computer is problematic - For openers you

                  need a PC with a parallel port - If you have a 386 w/ a parallel port card,

                  & a PC-IF, PCIF.exe works great...


                    Amended -

                    ... If you have a 186/286/386, running MS-DOS 3x - 6x, w/ a parallel port card,

                    & connected PC-IF, PCIF.exe works great...


                      More info about the CALL-able subroutines packaged w/ PC-IF:


                      74 loadable subroutines are essentially identical to the corresponding CC40

                      subroutines contained in ROM, except for exec addresses, buffer addresses,

                      & so on.

                      HTH, Jack


                        Thank you Jack for all the great info. I'll see if I can find a PC-IF and an appropriate computer.

                        It's a shame TI didn't build this capability into the TI-74 in the just seems like there should be an easier way.


                          I'm guessing that it may not be clear to everyone interested that many of the

                          CC40s CALL-able subpgms (in ROM) are not present in the 74 ROM; invoking

                          them produces a "Not Found" error.

                          Most of these routines can be installed in 74 RAM with "LOAD.PGM" via a PC-IF

                          connected PC, & then CALL-ed from the command line, or from a pgm.

                          There are solutions which elide the PC-IF connected PC.

                          Those interested may contact me.


                            " There are solutions which elide the PC-IF connected PC.

                            Those interested may contact me. "

                            Thank you Jack. I may have a problem finding a suitable computer or the PC-IF. If there are alternate ways to peek/poke/exec within the TI-74 I'd be very interested.

                            I'm having a problem posting on this website. The software requires my posts to be approved by a moderator which doesn't seem to happen. I submitted a post yesterday thanking you for the information which still hasn't been posted. I also sent a PM inquire about what you said above.

                            If this ever gets posted, please leave information if it's possible to peek/poke/exec without having a PCIF/computer setup.