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Schmitzi

TI-99/4A - Show your modded systems here

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If you can get it working again, you can test as follows:

 

If the computer immediately resets on button press -> Reset

If it locks up, restart, do a CALL LOAD(-4,131,224,0,36) and try again. If it resets -> Load interrupt

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My HFDC seems to be defect :( No reaction on anything.... it´s back to the shelf now

 

As there was so much struggle today, I decided to test my floppydrives first.

 

IMG_5027.thumb.JPG.e59da03307d3e7cc1715a8ea7eb32847.JPG

 

 

 

 

 

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 Here the theory about my airflow:

 

just remember, the 2 additional fans in the front of the PEB:

 

IMG_5018.thumb.JPG.a9693095e55518cc5ba493ccbbdf866b.JPG

 

 

 

I mounted the external heatsink from the Myarc DDCC-1 sitting very tight on the backside of the PEB,

1.) right in the airstream of fan #3   and   2.) with full contact to the PEBs cold metal housing.

This really works good. Before, this thing was so damn hot that I could not hold in my hands after 10 minutes or so,

NOW, it´s just a little bit warm and that after half an hour of full business with 4 drives  :thumbsup: 🏋️‍♂️

 

IMG_5151.thumb.JPG.9af3ebecf695a12c0cd277dcd77d3022.JPGIMG_5154.thumb.JPG.048e82243c5619ff7e675ef6c94c5424.JPG

 

 

When I touch the other cards, Geneve and Ramdisk, this is no more such hot as before. Much better.

(But the top cover must be closed that this concept works)

And it is not loud or so, with the 2+1 fans. They are not reduced in speed at this moment,

this maybe will follow when I got the exact temperatures. (How do I get them ??? With some expensive toys ?)

 

1058988081_IMG_5167-AIRFLOW.thumb.JPG.b347fb2e44d1a9caf1cc07ffdfc209aa.JPG

 

 

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On 1/30/2021 at 7:22 PM, Schmitzi said:

My HFDC seems to be defect :( No reaction on anything.... it´s back to the shelf now

 

As there was so much struggle today, I decided to test my floppydrives first.

 

IMG_5027.thumb.JPG.e59da03307d3e7cc1715a8ea7eb32847.JPG

 

 

 

 

 

I really dont know what a HFDC is. But, have you already tried another transformer / power supply?

Edited by Sid1968

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30 minutes ago, Sid1968 said:

I really dont know what a HFDC is. But, have you already tried another transformer / power supply?

 

At the moment we think this may be the problem: (last pic in the post):

 

https://atariage.com/forums/topic/316273-geneve-9640-configuration-questions-over-questions/?do=findComment&comment=4748242

 

 

 

 

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Here is a no cut F18a modded TI-99/4a I did for a customer a week ago.

 

Module is bolted on so no adhesives were used to secure it. Non destructive so no damage was done to the shell and it 100% reversible.  :)

145631941_762805204343582_7481431446092765469_o.jpg

145574018_762805257676910_8982817517283544308_o.jpg

147412323_762805314343571_2451653279020412508_o.jpg

145841758_762805377676898_1114666237525609243_o.jpg

147364144_762805487676887_2451272665560986625_o.jpg

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1 hour ago, Schmitzi said:

 

At the moment we think this may be the problem: (last pic in the post):

 

https://atariage.com/forums/topic/316273-geneve-9640-configuration-questions-over-questions/?do=findComment&comment=4748242

 

 

 

 

 

So the first thing to do is to see if all cables are properly connected. Maybe change the power cord. Then use a different power supply / transformer. If you have a circuit diagram, you should measure whether the voltages are correctly applied everywhere. If you don't understand anything about measuring, I would have re-soldered the soldering points in your place. Just heat it up again. They don't look really fresh anymore. Maybe you have a cold solder joint somewhere on the board. I've already had that on one of my VIC-20s. I don't know the circuit diagram, but does the left capacitor leg touch the contact on the right? It would certainly not damage your board or the contacts if it was cleaned with isopropanol. ;-)

 

Do everything at your own risk.

Edited by Sid1968
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43 minutes ago, Ruggers Customs said:

Here is a no cut F18a modded TI-99/4a I did for a customer a week ago.

Module is bolted on so no adhesives were used to secure it. Non destructive so no damage was done to the shell and it 100% reversible.  :)

147412323_762805314343571_2451653279020412508_o.jpg

 

Damn!  That's nice!  Anymore pics... like of the interior?

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50 minutes ago, Ruggers Customs said:

Here is a no cut F18a modded TI-99/4a I did for a customer a week ago.

 

Module is bolted on so no adhesives were used to secure it. Non destructive so no damage was done to the shell and it 100% reversible.  :)

Lovely!! But how'd you route the VGA cable without pinching it?

 

That is a really nice shell :)

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6 minutes ago, Omega-TI said:

 

Damn!  That's nice!  Anymore pics... like of the interior?

Ty sir!  I just have the pics of the power supply board and the mobo out of the case.  There's not really anything else to show.  The mounting brackets are covered up by the rf shield so no way to get a real good picture of that.  Inside the signal box is just the flat cable for the vga, two red led light strips and wires for the audio.   After I designed and printed the box, I remembered that composite no doesn't exist with the f18a.  So the yellow jack is on there for looks haha.

 

Recapped both boards and the f18a just plugged into the mobo.  I had to replace that 9918 single wipe socket with a machined pin socket.

145880087_762812377676198_3546307496892745930_o.jpg

145719665_762812281009541_6144221003978517647_o.jpg

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7 minutes ago, Tursi said:

Lovely!! But how'd you route the VGA cable without pinching it?

 

That is a really nice shell :)

 

The 5 pin din is removed since there's no need for it anymore. That will go back to the customer along with the tms9918 & heatsink. The flat cable had to be cut and folded over to fit through the hole.  Then I just soldered all the wires back together inside the box and heat shrinked every wire.

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Right.. makes sense. I read "non-destructive" as "no changes that require a soldering iron". Definitely easy to reverse though ;)

 

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Keyboard Mod "Readiness" :grin: Good Morning :)

 

 

IMG_5657.thumb.JPG.ae8ce149378525a2a5e0e15ca06a54f5.JPG

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205676527_TI99testsystem.thumb.jpg.48a6fe00b41a98e6c1e63d8616eefc4f.jpg

 

This is my test end development system with in the background my Geneve system.

The test end development system contains an RS232 card with HDX, SAMS memory card, IDE card, TI diskcontroller and a card with stuff I'm working on (usually a 10 years project). In the front the first version of the TiBus project (see my website ti99-geek.nl for some details of the first year ... still nine years to go). I'm using a switching power supply here ... all cards have their voltage regulators removed.

 

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Posted (edited)

Here it is, probably the only pink TI-99/4A in the world! 

What if TI hade made computer in different colors, maybe that could have been a success?

 

I had this computer laying around for no use, it had a lot of scratches on the plastic, so I decided to save it from not being used.

It is my daughters computer for her to enjoy, it has an F18A (thanks @Hans23!), FinalGrom99, TIPI with a mouse and it works just fine, I noticed that the power led doesn't work.

The color is called Hell Pink and I left the plastic shell to a professional paint shop to remove the scratches and paint it.

 

 

 

IMG_20210430_141413.thumb.jpg.10f49c3e481bfebade76b9a26bfae952.jpgIMG_20210430_141403.thumb.jpg.44db6c5b3a10e293e52382db0c3b510a.jpgIMG_20210430_141346.thumb.jpg.d5addc320a94565f5a074f54e511d350.jpg

Edited by Nick99
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