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  1. Replies
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    Speaking of spaghetti code... "8) Just...

    Speaking of spaghetti code... "8)

    Just kidding - BASIC limits choice in this regard.

    Although it can be done...
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    Typo fix - BASIC Line numbers 260 & 270 are: ...

    Typo fix - BASIC Line numbers 260 & 270 are:


    * 260 IF HIN<10 THEN HIN$=CHR$(HIN+48) ELSE HIN$-CHR$(HIN+55)

    * 270 IF LON<10 THEN LON$=CHR$(LON+48) ELSE LON$-CHR$(LON+55)


    and should be:
  3. Replies
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    Do thermal printers for programmable calculators...

    Do thermal printers for programmable calculators count? :) I picked up

    a TI PC-100(C?) for my TI-59 in 1977(?, IIRC...). It made me realize how

    useful a real printer might be - Hard copy...
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    Warning: Spaghetti Code...

    What's all this embedded code stuff, anyway? Why not just use GETMEM and

    read the code <from> the DATA statement into RAM?

    Because - The guy I wrote this for has a super-rare "Tiger-Stripe"...
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    In my sheltered life, I'd never heard of a...

    In my sheltered life, I'd never heard of a Printer 80 - Sounds good though.
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    OK, I found the Printer 80 user manual at...

    OK, I found the Printer 80 user manual at whtech, and dumping ROM to it

    looks doable - I've never seen, or used, a Printer 80...
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    What I used between the '74 & the PC: ...

    What I used between the '74 & the PC: https://www.adafruit.com/product/284

    Genuine FTDI, works great.
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    Sure, if you know the protocol the printer...

    Sure, if you know the protocol the printer expects.

    But it might be simpler to write the data to file on a PC, through a Serial-to-USB

    Converter to a Terminal Emulator on the PC. Do you have...
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    Bugfix - Change >201A in attachment from >7F to...

    Bugfix - Change >201A in attachment from >7F to >FF.

    Attachment has also been corrected - I hope...
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    Fun with CC40s

    I've been poking around in ROM, trying to learn a bit more about

    Hook tables in System RAM. A few years ago Acadiel asked me to

    write a pgm to dump the CC40 system ROMs - I'd thought the...
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    I was wondering what happened to the Cortex...

    I was wondering what happened to the Cortex crowd... "8)

    Jack
  12. If I was going to go to the trouble of fitting a...

    If I was going to go to the trouble of fitting a non drop-in RTC, I'd use one

    of the Maxim DS 3232 (I2C) or 3234 (SPI) chips.

    Chronometer-grade timekeeping right out of the box, for less...
  13. Replies
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    Steam engines are a lot of fun - Here's the...

    Steam engines are a lot of fun - Here's the dynamometer pgm

    I mentioned awhile back - Nothing special, but might be useful...
    ...
  14. Replies
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    ...I am trying to sort out how it was decided...

    ...I am trying to sort out how it was decided that the two bits were to be used for paging. Are there routines in the ROM using them in that way?

    Sorry I missed this 1st time through... I loaded...
  15. Replies
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    Hi Thumbs - It's possible to store data above the...

    Hi Thumbs - It's possible to store data above the high memory pointer

    (assuming you have RAM above the high memory pointer), & it will sur-

    vive power cycling, & (usually) crashes.
  16. Replies
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    Pretty cool, Thumbs. I've got a bicycle...

    Pretty cool, Thumbs. I've got a bicycle dynamometer program somewhere -

    I'll see if I can find it.

    Jack
  17. Replies
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    I'm guessing that it may not be clear to everyone...

    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.
    ...
  18. Replies
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    Hi Jon, The 74 & 74S ROMs are slightly...

    Hi Jon,

    The 74 & 74S ROMs are slightly different. Bug fixes mostly; the most

    significant one I know about is a bug in one of the trig identity functions.

    ADDMEM also behaves differently,...
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    More info about the CALL-able subroutines...

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

    https://computerarchive.org/files/mirror/ftp.whtech.com/hexbus_cc40_ti74/CC40%20user%20guide/

    74 loadable subroutines are...
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    Amended - ... If you have a 186/286/386, ...

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

    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:
    ...
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    Hi fellows - PEEK, POKE, & EXEC are...

    Hi fellows -

    PEEK, POKE, & EXEC are available as callable sub-routines.
  23. Replies
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    Hi Jon. In the 74 ADDMEM will add 8K to SYSRAM, ...

    Hi Jon. In the 74 ADDMEM will add 8K to SYSRAM, assuming its available.

    In the 74S ADDMEM will append up to 32K to SYSRAM. HTH. Jack
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    Brain - The article referenced by SMB is...

    Brain -

    The article referenced by SMB is here:

    http://ftp.whtech.com/hexbus_cc40_ti74/cc40%20ti74%20hexbus.txt

    Bits 2 & 3 of the Peripheral File register P25 control the cartridge paging
    ...
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    I like the bad ground suggestion, followed by a...

    I like the bad ground suggestion, followed by a thorough examination of power

    & power distribution, before more ambitious surgery.

    I've been bit several times by flaky ON/OFF switches, ...
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