Flottmann1 Posted September 5, 2017 Share Posted September 5, 2017 I thought I'd look at a TI-99/4A Console, which only shows black Screen when switching on .first I had changed the TMS9918A in this PAL Machine, nothing - Screen blackthen I changed the SN76494N, and now - the original TI-99 Welcome screen what is this Chip 2 Quote Link to comment Share on other sites More sharing options...
RickyDean Posted September 5, 2017 Share Posted September 5, 2017 I thought I'd look at a TI-99/4A Console, which only shows black Screen when switching on . first I had changed the TMS9918A in this PAL Machine, nothing - Screen black then I changed the SN76494N, and now - the original TI-99 Welcome screen what is this Chip Look here, this will get you started : http://www.unige.ch/medecine/nouspikel/ti99/tms9919.htm 2 Quote Link to comment Share on other sites More sharing options...
+Ksarul Posted September 5, 2017 Share Posted September 5, 2017 It is the sound chip--and if it fails to initialize, you will get the black screen of death. . . 2 Quote Link to comment Share on other sites More sharing options...
+Schmitzi Posted September 6, 2017 Share Posted September 6, 2017 I prefer the blue screen, © by Microsofft Quote Link to comment Share on other sites More sharing options...
Flottmann1 Posted September 6, 2017 Author Share Posted September 6, 2017 (edited) I also found a TI-99 modified Console by TI-Workshop Wiesbaden 32 K Memory this show me @1981 PEXAS INSTRUIEJTS Edited September 6, 2017 by Flottmann1 2 Quote Link to comment Share on other sites More sharing options...
Stuart Posted September 6, 2017 Share Posted September 6, 2017 I also found a TI-99 modified Console by TI-Workshop Wiesbaden 32 K Memory this show me @1981 PEXAS INSTRUIEJTS That shows that one or more of your video RAM chips are bad. 2 Quote Link to comment Share on other sites More sharing options...
+Ksarul Posted September 6, 2017 Share Posted September 6, 2017 Note also that the error is a bit intermittent, as the letter "E" is correct sometimes and bad at others. . .but it is definitely a VDP RAM issue, as Stuart noted. 2 Quote Link to comment Share on other sites More sharing options...
Flottmann1 Posted September 6, 2017 Author Share Posted September 6, 2017 (edited) I have also found a defect TI-99/4A Board with Ceramic TMS9900 ,thought these were only installed in the 99/4 Edited September 6, 2017 by Flottmann1 4 Quote Link to comment Share on other sites More sharing options...
RickyDean Posted September 6, 2017 Share Posted September 6, 2017 I have also found a defect TI-99/4A Board with Ceramic TMS9900 ,thought these were only installed in the 99/4 If you don't want it, I'll gladly send you a plastic 9900, to take it's place, exchange. 1 Quote Link to comment Share on other sites More sharing options...
+chue Posted September 7, 2017 Share Posted September 7, 2017 (edited) I have also found a defect TI-99/4A Board with Ceramic TMS9900 ,thought these were only installed in the 99/4 Oh man, I have to open up my TIs now to check! I'm not holding my breath though. Edited September 7, 2017 by chue Quote Link to comment Share on other sites More sharing options...
Stuart Posted September 7, 2017 Share Posted September 7, 2017 If you don't want it, I'll gladly send you a plastic 9900, to take it's place, exchange. Note though that it is soldered in, and would be a right pain to remove. White ceramic 9900's come up fairly cheap on eBay occasionally if you really want one. There are some rather fetching purple ceramic ones as well. Quote Link to comment Share on other sites More sharing options...
RickyDean Posted September 7, 2017 Share Posted September 7, 2017 Note though that it is soldered in, and would be a right pain to remove. White ceramic 9900's come up fairly cheap on eBay occasionally if you really want one. There are some rather fetching purple ceramic ones as well. I've got two, that I have had for over twenty years, I have desoldered them before I thought about using this one on your 9900 board, All I have left to put on it at this time is the little stuff, that was not included in the package. All the IC's are mounted in sockets. 2 Quote Link to comment Share on other sites More sharing options...
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