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TI DS990 Model 1


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#1 piero.a OFFLINE  

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Posted Thu Apr 16, 2015 12:50 PM

Hello everybody,

 

I recently got a DS990 Model 1, Double Floppy FD1000 and printer. I'm desperately searching for schematics but without success. I already look in bitsavers and other sites.

 

On my VDU Controller ( diagram 993422)  U25 and U14 seems to be missing. If somebody have same card may let me know which IC are on those places?

 

Thanks!

 

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#2 Schmitzi OFFLINE  

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Posted Thu Apr 16, 2015 1:11 PM

Hi Piero,

 

please have a look here:

 

ftp://u67140205-atariage:TeXasTI994A@toxic-instruments.com/_DOCUMENTS.bak/TI-990/

 

If it is not the right material, pls let me now. Have some more, but was too much for a quick upload right now.

 

Good luck :)


Edited by schmitzi, Thu Apr 16, 2015 1:14 PM.


#3 Lee Stewart OFFLINE  

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Posted Thu Apr 16, 2015 2:28 PM

Stuart is our resident 990 expert and should be along ere long.

 

...lee



#4 Flottmann1 OFFLINE  

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Posted Thu Apr 16, 2015 2:39 PM

see also here

 

https://archive.org/...lation_djvu.txt

 

 

Graphics kit which includes:

• ROM (32 X 8 bit words), part number 972923-

0001, U25 on VDU circuit card.

• ROM (32 X 8 bit words), part number 972923-

0002, U14 on VDU circuit card.

 

 

and here  Site's for

Texas Instruments (TI) 990

 

 

http://www.cozx.com/~dpitts/ti990.html

 

http://www.ricompute...ti-99010--99012


Edited by Flottmann1, Thu Apr 16, 2015 3:34 PM.


#5 Stuart OFFLINE  

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Posted Thu Apr 16, 2015 3:49 PM

Stuart is our resident 990 expert and should be along ere long.

 

...lee

Nope, two different systems! The poster has a TI990 (with an "I"), I have TM990 (with an "M"). TI990 was aimed at office-type systems, and the TM990 for industrial control sort of applications.

 

Stuart.



#6 piero.a OFFLINE  

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Posted Sat Apr 18, 2015 3:45 PM

Hi Piero,

 

please have a look here:

 

ftp://u67140205-atariage:TeXasTI994A@toxic-instruments.com/_DOCUMENTS.bak/TI-990/

 

If it is not the right material, pls let me now. Have some more, but was too much for a quick upload right now.

 

Good luck :)

Thanks a lot but I already found this. There are some documents but not schematics. I'm looking specially for diagram 993422



#7 piero.a OFFLINE  

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Posted Sat Apr 18, 2015 3:47 PM

Nope, two different systems! The poster has a TI990 (with an "I"), I have TM990 (with an "M"). TI990 was aimed at office-type systems, and the TM990 for industrial control sort of applications.

 

Stuart.

This is my one:

 

http://www.old-compu...asp?st=1&c=1025



#8 piero.a OFFLINE  

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Posted Sat Apr 18, 2015 3:53 PM

Graphics kit which includes:

• ROM (32 X 8 bit words), part number 972923-

0001, U25 on VDU circuit card.

• ROM (32 X 8 bit words), part number 972923-

0002, U14 on VDU circuit card.

You are right!! Graphic Kit is missing!!

 

Anybody have those two prom dumped??


Edited by piero.a, Sat Apr 18, 2015 3:55 PM.


#9 Ksarul ONLINE  

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Posted Sat Apr 18, 2015 4:44 PM

The most likely sources for 990 stuff on the net are Al Kossow and Dave Pitts. They've been amassing data on TI systems for decades now. . .so if they don't have it, it mat not be out there any more.



#10 mizapf OFFLINE  

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Posted Sat Apr 18, 2015 4:55 PM

I'm not sure whether we're talking of these boards, but don't the TM990 boards have a TMS9980A, while the TI990 is a minicomputer with a TMS 9900 CPU implemented as a TTL circuit board (with some additional features that did not make it into the TMS9900 later)?



#11 piero.a OFFLINE  

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Posted Sun Apr 19, 2015 5:32 AM

Yes, those are the two board with TMS9900, CPU and I/O Controller

 

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#12 mizapf OFFLINE  

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Posted Sun Apr 19, 2015 6:36 AM

Hmm ... no, I had those in mind, so maybe there were different projects behind ...

 

http://computermuseu.../dev/tm990_189/

 

http://www.cozx.com/~dpitts/ti990.html

 

http://computermuseu...e/dev/ti990_10/

 

Ah, wait a minute, on the bottom of that last page, the authors say that in the "little brother" of the 990/10, the 990/4, the TMS9900 was used as a circuit. So these boards above could indeed be 990/4 boards.



#13 piero.a OFFLINE  

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Posted Thu Apr 23, 2015 1:28 PM

Fix it will be an hard run for me...

 

Processor on CPU board (the one with speaker) seems to be running but no beep form speaker and no one led is on on keyboard .

I/O processor unit which have roms onboard is held on reset.

Monitor is black.



#14 piero.a OFFLINE  

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Posted Fri Apr 24, 2015 10:57 AM

I found one ram with addressing problems, now "IDLE" and "EXEC" are on on keyboard but I/O processor still in reset and black monitor.

 

Somebody can tell me if before to boot from floppy should I see a cursor on monitor or should be all black?



#15 Flottmann1 OFFLINE  

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Posted Fri Apr 24, 2015 11:11 AM

ask  here for Spare Parts or Doku

 

http://www.ricomputermuseum.org/Home

Contact us

Email: rhodeislandcomputermuseum@gmail.com or
merle@ricomputermuseum.org
dan@ricomputermuseum.org
phone: (401) 603-3321

 

good Luck


Edited by Flottmann1, Fri Apr 24, 2015 11:12 AM.


#16 piero.a OFFLINE  

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Posted Fri Apr 24, 2015 3:57 PM

Thanks a lot! Fixed!!!

 

It where just a couple of ram with addressing problems. I havent' test them properly, i was stupid... but I'm really happy now!!

 

I just need to make boot floppy.

 

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