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Type: Posts; User: rlauzon

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    Tandy 1400LT display question

    Playing with my Tandy 1400LT, and I notice that when the floppy drive is active, the screen backlight dims a bit.

    Is that normal? Or should I be checking out the capacitors more thoroughly the...
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    1. Run a term program on the Model 4P and PC and...

    1. Run a term program on the Model 4P and PC and do file transfers.
    2. Get a FreHD for your 4D and there's a utility that will copy files from the SD card of the FreHD to your TRS-80.



    I'm not...
  3. Cool! Thanks! I remember seeing that before,...

    Cool! Thanks!

    I remember seeing that before, but I didn't dig very deep into the project, so I didn't see the conversion tools.
  4. Where is the HFE conversion tools for Linux?

    Where is the HFE conversion tools for Linux?
  5. The FreHD will also let you "mount" diskette...

    The FreHD will also let you "mount" diskette images to your system using the "dsk/dct" driver.
    The only downside is that you can't boot from those images, but it does work nicely to create bootable...
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    If you can wait until Oct/Nov, take it to Tandy...

    If you can wait until Oct/Nov, take it to Tandy Assembly.
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    I was going to say "but you have to put it...

    I was going to say "but you have to put it together", but then I checked out the web page (https://altairclone.com/ordering.html) and $621 is the assembled price.
  8. The fan on my 4P is noticiable, but not very...

    The fan on my 4P is noticiable, but not very loud. I can hear it start up, but while running, it's pretty quiet. My furnace is louder.
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    Check out...

    Check out https://en.wikipedia.org/wiki/Field-programmable_gate_array for all the details.

    tl;dr
    The gate array units were designed so that they would be backward compatible.

    So with my 4P,...
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    RAM issue resolved. The memory check showed it...

    RAM issue resolved. The memory check showed it was the 8 bit, so I started by just pulling the current chips and replacing them with some RAM chips that I had from a different 4P.

    I wasn't sure...
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    I finally got my latest addition working. ...

    I finally got my latest addition working.

    https://photos.app.goo.gl/67J9y2xN6cQty9B2A

    Model 4P Gate Array version. 128K.
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    So I'm finally able to get back to this project...

    So I'm finally able to get back to this project (Ya, 6 months later). Thanks to everyone who've helped.

    Short update:
    + The new RAM didn't work. I think that there was a problem with the...
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    According to that guide, it looks like the...

    According to that guide, it looks like the problem that I have with my Model 4P GA is that the U5 8040542 chip is bad.

    Does anyone know of a good place to get a replacement chip?
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    Did you test the floppy drive? The drive belt...

    Did you test the floppy drive? The drive belt turns to goo over time, so it won't do anything with a diskette.
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    Thanks for the warning. I was going to get the...

    Thanks for the warning. I was going to get the wrong chips.
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    Thanks! I was able to source some 4164 chips...

    Thanks!

    I was able to source some 4164 chips from Jameco. My 4P only has 64K right now, but it looks like I'll just upgrade it to 128K while I'm fixing the RAM.
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    TRS-80 Model 4P RAM question

    So I'm finally getting around to working on my model 4P.

    According to what I've been reading, the issue that I have is that some of the RAM is bad.

    The chips are labelled: 8040665 FQD8446, but...
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    As I recall (keep in mind that it's been 30+...

    As I recall (keep in mind that it's been 30+ years), there was a plan to install diskette drives there, but never happened.
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    Cool. I was able to locate replacement...

    Cool. I was able to locate replacement batteries. Now, I need to acquire time to install them.
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    My newest: My Tandy 1100FD...

    My newest: My Tandy 1100FD

    And my portables: PC-4, PC-3, PC-2 and Model 100

    I even have all the peripherals (working!) for my PC-2
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    1. There was a time when people thought that they...

    1. There was a time when people thought that they were junk and trashed them.
    2. There are still companies that use these old terminals on their equally old computers. I had a friend of mine that,...
  22. The Model 100/102 were sold well into the MS-DOS...

    The Model 100/102 were sold well into the MS-DOS era. The ability to run for days on 4-AA batteries coupled with a built in modem was a combination that was unbeatable for quite some time.

    I...
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    Battery question. As long as I don't have the...

    Battery question.

    As long as I don't have the battery plugged in when I hook it up to AC power, could I replace the battery with something like this.
  24. You might want to talk to a Sysop on one of these...

    You might want to talk to a Sysop on one of these BBSs. They are doing that now - some with REAL old hardware (like a real C-64 or Apple II).
  25. The first PC that I owned was a Sperry HT. It...

    The first PC that I owned was a Sperry HT. It was an IBM-XT compatible but with basically double the clock speed and the ability to put 4 5.25" floppy drives into it.
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