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  1. My rare items are pretty much centered on things...

    My rare items are pretty much centered on things with TI 9900 series processors in them.

    Marinchip S-9900
    Board set for a 1978 TI Dimension 4 prototype (the previous owner (a recycler) thought...
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    Do you hear any beeps or other sounds when you...

    Do you hear any beeps or other sounds when you turn it on? If you press a key right after it boots, do you hear a beep? You should hear a beep on startup and the first time you press a key (and you...
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    I used to love browsing eBay listings in the...

    I used to love browsing eBay listings in the areas of interest to me. The last couple of interface changes are truly annoying. Trying to give feedback for multiple transactions simultaneously is now...
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    Looking at the keytops on your beige keyboard,...

    Looking at the keytops on your beige keyboard, that is almost certainly a Mitsumi (membrane keyboard, the worst TI keyboard ever). What is funny about these is that at the beginning, everyone wanted...
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    2,178

    Have you put the Flex Card in a different slot in...

    Have you put the Flex Card in a different slot in the PEB? Sometimes changing the slot helps. Also, check with a different console if you have one. Sometimes the buffers in the console go bad too. . .
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    Since the light is on all the time for the...

    Since the light is on all the time for the controller, remove it and test your 32K again. If the 32K works, you can try again with the disk controller in the box--but try it in the seventh slot...
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    Really nice collection, Tez!

    Really nice collection, Tez!
  8. Thread: Poly 88 case

    by Ksarul
    Replies
    305
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    25,276

    I use a pace soldering/desoldering station, but...

    I use a pace soldering/desoldering station, but that is overkill for most hobby users. . .
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    The PALs are definitely blank, as CorComp always...

    The PALs are definitely blank, as CorComp always blew the fuses on their PALs, no known copy of the equations survives, and no one has taken the time to try and do a definitive I/O logic test to try...
  10. You might want to talk to Dave Pitts. He has a...

    You might want to talk to Dave Pitts. He has a website with a whole lot of TI-990 data. It doesn't mention the 990/1 specifically, but he may have some clues.
  11. Thread: Sanyo PHC 3100

    by Ksarul
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    1
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    377

    This is one I hadn't seen before, so thanks a lot...

    This is one I hadn't seen before, so thanks a lot for posting it. Now I have another TMS-9900 based computer to research. . .
  12. Sounds like it isn't finding a bootable operating...

    Sounds like it isn't finding a bootable operating system on the hard disk. You might want to try and boot it with a DOS disk in the floppy drive and look from there to see what you can see on the...
  13. Thread: Ti 99/4

    by Ksarul
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    738

    Definitely a good price for the /4 all by itself....

    Definitely a good price for the /4 all by itself. They usually go for between $180 and $220 each, without the monitor. That is the original Panasonic /4 monitor too. Those are usually about $100...
  14. And it appears that someone actually bought it...

    And it appears that someone actually bought it for the new BIN price. . .
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    I've been looking at the 99/4s for about as long...

    I've been looking at the 99/4s for about as long as they've been around (and I possess most of one of the Dimension 4 prototypes which preceded them (the innards, as the prior owner (a recycler)...
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    That is the classic symptom for a bad RAM chip....

    That is the classic symptom for a bad RAM chip. You have two options at this point. First would be to replace the RAM (assuming you have good soldering skills, as it is really easy to destroy an...
  17. I agree, this is one awesome demo. I burned a...

    I agree, this is one awesome demo. I burned a copy of the ROM to run it on my TI this weekend using one of the 512K Red cartridge boards. . .note that if you have access to a SAMS memory card for the...
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    You have a couple of options to remove the chips,...

    You have a couple of options to remove the chips, but it really depends on what type of soldering/desoldering equipment you have access to. You probably really want to protect the board from...
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    I like this project!

    I like this project!
  20. It was called a Back Plane on pretty much every...

    It was called a Back Plane on pretty much every machine I worked on back then. The Motherboard references started showing up with the single-board computers, as they had all of their electronics and...
  21. Thread: TI 99/4A Items

    by Ksarul
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    3
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    641

    I'm in Northern VA, in the vicinity of Ft...

    I'm in Northern VA, in the vicinity of Ft Belvoir. I'm interested in it and will make sure anything I don't use gets passed further into the community.
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    Definitely post the pics, as it will be...

    Definitely post the pics, as it will be interesting to see how you did the 9938 mod. One of these days I want to try and do up a little daughter board layout with a 9938 and its memory on it that I...
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    We are definitely still here--and active. This...

    We are definitely still here--and active. This thread has become one of the major Powertran Cortex resources on the Internet, and it makes me glad I started asking questions about the system when I...
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    You may want to play with the keys a little to...

    You may want to play with the keys a little to clear any stickiness from them. Pressing ten or twenty times will usually do it. With the early /4A keyboards, it was possible to pull the keytops and...
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    I've never seen a MIDI interface like that for...

    I've never seen a MIDI interface like that for the TI, although there is a MIDI Master software package with a special MIDI cable for the RS-232, so it is possible that this device might actually...
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