atrax27407 Posted January 17, 2022 Share Posted January 17, 2022 Dies anyone know, and can post, the location of the EVEN byte ROM on a QI motherboard? 1 Quote Link to comment Share on other sites More sharing options...
HOME AUTOMATION Posted January 17, 2022 Share Posted January 17, 2022 Can we take every other byte from here? 1 Quote Link to comment Share on other sites More sharing options...
+Ksarul Posted January 17, 2022 Share Posted January 17, 2022 It is actually to figure out which of the two console ROM chips is for the even bytes on a QI console so that a modified chip will land in the correct socket. . . 1 Quote Link to comment Share on other sites More sharing options...
HOME AUTOMATION Posted January 17, 2022 Share Posted January 17, 2022 Haha, looks like I got the question wrong. (Okay, do-over) Looking at the QI schematic... U3, connects to DATA LINES CD0 - CD7(odd), while U5 connects to DATA LINES CD8 - CD15(even). Any better? 2 Quote Link to comment Share on other sites More sharing options...
HOME AUTOMATION Posted January 17, 2022 Share Posted January 17, 2022 TI 994/A Console And Peripheral Expansion System Technical Data 2 Quote Link to comment Share on other sites More sharing options...
HOME AUTOMATION Posted January 17, 2022 Share Posted January 17, 2022 Physical location... TI 994/A Console And Peripheral Expansion System Technical Data 2 Quote Link to comment Share on other sites More sharing options...
atrax27407 Posted January 17, 2022 Author Share Posted January 17, 2022 U3 is the odd byte ROM and U5 is the even byte ROM. Is that for the standard console or the QI version (which has the motherboard revised)? 1 Quote Link to comment Share on other sites More sharing options...
+Ksarul Posted January 17, 2022 Share Posted January 17, 2022 Looking at the schematic @HOME AUTOMATION linked to, this is for the QI board (at least that's what the note on the bottom of the schematic says). 1 Quote Link to comment Share on other sites More sharing options...
HOME AUTOMATION Posted January 17, 2022 Share Posted January 17, 2022 That's as much as I know, I don't have a QI, anymore. Thumbing back a few pages, reveals the schematics and layout of the standard console. 2 Quote Link to comment Share on other sites More sharing options...
atrax27407 Posted January 17, 2022 Author Share Posted January 17, 2022 For reference, where are the EVEN and ODD byte ROMs on a standard console.? 2 Quote Link to comment Share on other sites More sharing options...
+Lee Stewart Posted January 17, 2022 Share Posted January 17, 2022 3 minutes ago, atrax27407 said: For reference, where are the EVEN and ODD byte ROMs on a standard console.? Even byte is U610 (parallel to the TMS9900). Odd byte is U611 (perpendicular to the TMS 9900). ...lee 2 Quote Link to comment Share on other sites More sharing options...
+mizapf Posted January 17, 2022 Share Posted January 17, 2022 If you have a look inside the ROM sets of MAME (ti99_4a.zip), you will see that I named the files according to the socket of the ROM. $ unzip -t ti99_4a.zip Archive: ti99_4a.zip testing: 994a_grom0.u500 OK testing: 994a_grom1.u501 OK testing: 994a_grom2.u502 OK testing: 994a_rom_hb.u610 OK testing: 994a_rom_lb.u611 OK No errors detected in compressed data of ti99_4a.zip. However, I did not do this for the QI, as the ROMs are identical except for GROM 0, and the other ROMs are taken from the "parent" system (ti99_4a.zip). $ unzip -t ti99_4qi.zip Archive: ti99_4qi.zip testing: 994qi_grom0.u29 OK No errors detected in compressed data of ti99_4qi.zip. 2 Quote Link to comment Share on other sites More sharing options...
atrax27407 Posted January 17, 2022 Author Share Posted January 17, 2022 Thanks, all! 1 Quote Link to comment Share on other sites More sharing options...
Swim Posted January 17, 2022 Share Posted January 17, 2022 Ditto what atrax27407 typed. Quote Link to comment Share on other sites More sharing options...
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