piero.a Posted April 16, 2015 Share Posted April 16, 2015 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! Quote Link to comment Share on other sites More sharing options...
+Schmitzi Posted April 16, 2015 Share Posted April 16, 2015 (edited) 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 April 16, 2015 by schmitzi Quote Link to comment Share on other sites More sharing options...
+Lee Stewart Posted April 16, 2015 Share Posted April 16, 2015 @Stuart is our resident 990 expert and should be along ere long. ...lee Quote Link to comment Share on other sites More sharing options...
Flottmann1 Posted April 16, 2015 Share Posted April 16, 2015 (edited) see also here https://archive.org/stream/bitsavers_ti990ds990temModel1SitePreparationandInstallation_3884406/2262325-9701_DS990_System_Model_1_Site_Preparation_and_Installation_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.ricomputermuseum.org/Home/equipment/ti-99010--99012 Edited April 16, 2015 by Flottmann1 Quote Link to comment Share on other sites More sharing options...
Stuart Posted April 16, 2015 Share Posted April 16, 2015 @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. Quote Link to comment Share on other sites More sharing options...
piero.a Posted April 18, 2015 Author Share Posted April 18, 2015 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 1 Quote Link to comment Share on other sites More sharing options...
piero.a Posted April 18, 2015 Author Share Posted April 18, 2015 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-computers.com/museum/computer.asp?st=1&c=1025 Quote Link to comment Share on other sites More sharing options...
piero.a Posted April 18, 2015 Author Share Posted April 18, 2015 (edited) 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 April 18, 2015 by piero.a Quote Link to comment Share on other sites More sharing options...
+Ksarul Posted April 18, 2015 Share Posted April 18, 2015 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. Quote Link to comment Share on other sites More sharing options...
+mizapf Posted April 18, 2015 Share Posted April 18, 2015 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)? Quote Link to comment Share on other sites More sharing options...
piero.a Posted April 19, 2015 Author Share Posted April 19, 2015 Yes, those are the two board with TMS9900, CPU and I/O Controller Quote Link to comment Share on other sites More sharing options...
+mizapf Posted April 19, 2015 Share Posted April 19, 2015 Hmm ... no, I had those in mind, so maybe there were different projects behind ... http://computermuseum.informatik.uni-stuttgart.de/dev/tm990_189/ http://www.cozx.com/~dpitts/ti990.html http://computermuseum.informatik.uni-stuttgart.de/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. Quote Link to comment Share on other sites More sharing options...
piero.a Posted April 23, 2015 Author Share Posted April 23, 2015 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. Quote Link to comment Share on other sites More sharing options...
piero.a Posted April 24, 2015 Author Share Posted April 24, 2015 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? Quote Link to comment Share on other sites More sharing options...
Flottmann1 Posted April 24, 2015 Share Posted April 24, 2015 (edited) ask here for Spare Parts or Doku http://www.ricomputermuseum.org/HomeContact usEmail: rhodeislandcomputermuseum@gmail.com ormerle@ricomputermuseum.orgdan@ricomputermuseum.orgphone: (401) 603-3321 good Luck Edited April 24, 2015 by Flottmann1 1 Quote Link to comment Share on other sites More sharing options...
piero.a Posted April 24, 2015 Author Share Posted April 24, 2015 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. 1 Quote Link to comment Share on other sites More sharing options...
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