Zak Posted May 19, 2021 Share Posted May 19, 2021 Hi! I am repairing a COLECO GEMINI and apparently the E4002 chip (TIA clone) is damaged. I think about the possibility of replacing it with an ATARI TIA remapping the legs, the problem is that I cannot clearly find how I would have to redirect the legs. I found the pinout of each chip but they are named differently. maybe you know about the subject and can help me to achieve a comparison of pins E4002 GEMINI / TIA Atari e4002 pinout: https://console5.com/wiki/E4002 TIA pinout: https://console5.com/wiki/TIA E4002 GEMINI : TIA Atari pin 1 : 1 (GND) pin 2 : ?????? pin 3 : 3 (RDY) pin 4 : 2 (SYNC) ?? pin 5 : ????? pin 6 : ????? pin 7 : ????? pin 8 : ????? pin 9 : ????? pin 10 : 10 (Color Adjust) pin 11 : 11 (OSC input) pin 12 : 14 (DB0) pin 13 : 15 (DB1) pin 14 : 16 (DB2) pin 15 : 17 (DB3) pin 16 : 18 (DB4) pin 17 : 19 (DB5) pin 18 : 33 (DB6) pin 19 : 34 (DB7) pin 20 : 20 (Vcc) pin 21 : 24 (CS0) pin 22 : 23 (CS1) pin 23 : 22 (CS2) pin 24 : 21 (CS3) pin 25 : 25 (R/W) pin 26 : 26 (Φ2) pin 27 : 13 (Sound B) pin 28 : 12 (Sound A) pin 29 : 27 (A5) pin 30 : 28 (A4) pin 31 : 29 (A3) pin 32 : 30 (A2) pin 33 : 31 (A1) pin 34 : 32 (A0) pin 35 : 35 (Trigger 1) pin 36 : 36 (Trigger 0) pin 37 : 37 (Pot 3) pin 38 : 38 (Pot 2) pin 39 : 39 (Pot 1) pin 40 : 40 (Pot 0) thank you very much for the help cc @ChildOfCv Quote Link to comment Share on other sites More sharing options...
alex_79 Posted May 19, 2021 Share Posted May 19, 2021 2 hours ago, Zak said: E4002 GEMINI : TIA Atari pin 1 : 1 (GND) pin 2 : 4 (Φ0) pin 3 : 3 (RDY) pin 4 : 2 (C.SYNC) pin 5 : 7 (LUMA OUT 2) pin 6 : 5 (LUMA OUT 1) pin 7 : 8 (LUMA OUT 0) pin 8 : 6 (V. Blank) pin 9 : 9 (COLOR OUTPUT) pin 10 : 10 (Color Adjust) pin 11 : 11 (OSC input) pin 12 : 14 (DB0) pin 13 : 15 (DB1) pin 14 : 16 (DB2) pin 15 : 17 (DB3) pin 16 : 18 (DB4) pin 17 : 19 (DB5) pin 18 : 33 (DB6) pin 19 : 34 (DB7) pin 20 : 20 (Vcc) pin 21 : 21 (/CS3) pin 22 : 22 (/CS2) pin 23 : 23 (CS1) pin 24 : 24 (/CS0) pin 25 : 25 (R/W) pin 26 : 26 (Φ2) pin 27 : 13 (Sound B) pin 28 : 12 (Sound A) pin 29 : 27 (A5) pin 30 : 28 (A4) pin 31 : 29 (A3) pin 32 : 30 (A2) pin 33 : 31 (A1) pin 34 : 32 (A0) pin 35 : 35 (Trigger 1) pin 36 : 36 (Trigger 0) pin 37 : 37 (Pot 3) pin 38 : 38 (Pot 2) pin 39 : 39 (Pot 1) pin 40 : 40 (Pot 0) Double check using the attached pdf: see pages 31-32 for a descriptions of the pins, and the diagram on page 35 for the active state of the "chip select" pins. ColecoVision_Expansion_Module_1_Tech_Specs.pdf 1 Quote Link to comment Share on other sites More sharing options...
Zak Posted May 20, 2021 Author Share Posted May 20, 2021 Thank you very much @alex_79, in these days I will be testing the adaptation. I already have a replacement TIA. Quote Link to comment Share on other sites More sharing options...
+ArcadeJunkie Posted May 30, 2021 Share Posted May 30, 2021 i believe you may be able to harvest a replacement one from a coleco expansion module 1. That is how I repaired mine. Quote Link to comment Share on other sites More sharing options...
Zak Posted May 31, 2021 Author Share Posted May 31, 2021 Thanks @ArcadeJunkie. Here in Argentina is more dificult to get an Expansion Module #1 than another Gemini. But, it's not a bad idea to keep in mind that you can get a replacement from there. 1 Quote Link to comment Share on other sites More sharing options...
dognaldo Posted July 28, 2022 Share Posted July 28, 2022 On 5/31/2021 at 12:22 AM, Zak said: Thanks @ArcadeJunkie. Here in Argentina is more dificult to get an Expansion Module #1 than another Gemini. But, it's not a bad idea to keep in mind that you can get a replacement from there. Hi, Did you complete the repair? Did you replace the E4002 GEMINI with a TIA Atari? Quote Link to comment Share on other sites More sharing options...
Zak Posted August 7, 2022 Author Share Posted August 7, 2022 On 7/28/2022 at 7:41 PM, dognaldo said: Hi, Did you complete the repair? Did you replace the E4002 GEMINI with a TIA Atari? No. I finally found the fault on the motherboard, it was a bad diode causing the black screen. It will be pending to test if the E4002 can really be replaced by a TIA Quote Link to comment Share on other sites More sharing options...
pcrock Posted December 22, 2022 Share Posted December 22, 2022 A friend os mine, here in Brazil, made a small PC board adapter to use an ATARI TIA 6526N to replace Gemini E4002 IC. It Works perfect! 1 Quote Link to comment Share on other sites More sharing options...
Zak Posted December 22, 2022 Author Share Posted December 22, 2022 6 hours ago, pcrock said: A friend os mine, here in Brazil, made a small PC board adapter to use an ATARI TIA 6526N to replace Gemini E4002 IC. It Works perfect! great job, could you get the board files and schematic? tnks cc @Alesmukler 1 Quote Link to comment Share on other sites More sharing options...
pcrock Posted December 22, 2022 Share Posted December 22, 2022 (edited) As I said, that was done by a friend of mine. I asked for the PCB files and if I get them I will share here for sure. Edited December 22, 2022 by pcrock 1 Quote Link to comment Share on other sites More sharing options...
pcrock Posted January 2 Share Posted January 2 On 12/22/2022 at 10:19 AM, Zak said: great job, could you get the board files and schematic? tnks cc @Alesmukler Today I did this Pinout converter plan. Please keep on mind that I haven't tested it yet!!! If you plain to test it, please tell us the results. Quote Link to comment Share on other sites More sharing options...
pcrock Posted January 3 Share Posted January 3 On 12/22/2022 at 10:19 AM, Zak said: great job, could you get the board files and schematic? tnks cc @Alesmukler Here is the great job (NOT TESTED YET) made by Brazilian friend Marco F. Costa. That's is an array to became able to use a NTSC ATARI TIA (CO10444D or 6526N or KSC131 and others) to replace the very hard to find Coleco Gemini E4002 TIA. I used the E4002 datasheet pinouts to check several times the schematics made by our friend Marco and compare with CO10444D datasheet. All about circuit looks very good to me. I did not find any error but you must to keep on mind that nothing here were actually tested yet. Special thanks for the friend Marco F. Costa from Brazil by his efforts on drawing the schematics. Quote Link to comment Share on other sites More sharing options...
dognaldo Posted April 1 Share Posted April 1 I've been using it for quite some time now. Works without problems. 2 Quote Link to comment Share on other sites More sharing options...
Zak Posted April 1 Author Share Posted April 1 4 hours ago, dognaldo said: I've been using it for quite some time now. Works without problems. Could you share the PCB design so that I can print it here in Argentina? Thank you very much in advance for your contribution, it looks excellent work 1 Quote Link to comment Share on other sites More sharing options...
ApolloBoy Posted April 3 Share Posted April 3 @pcrock do you mind if I post this onto the Consolemods wiki (link in my sig)? This would be great to have for Gemini and EM1 owners with a busted TIA clone. Quote Link to comment Share on other sites More sharing options...
pcrock Posted April 4 Share Posted April 4 Hi friend. I am looking for the schematics or the service manual for this coleco console compatible with Atari 2600. Do you have it to send me??? Thanks Quote Link to comment Share on other sites More sharing options...
ApolloBoy Posted April 4 Share Posted April 4 That didn't answer my question though. Quote Link to comment Share on other sites More sharing options...
dognaldo Posted April 7 Share Posted April 7 On 01/04/2023 at 19:10, Zak said: Você poderia compartilhar o projeto do PCB para que eu possa imprimi-lo aqui na Argentina? Desde já muito obrigado pela sua contribuição, parece um excelente trabalho E4002_1_2023-03-12.zip 1 Quote Link to comment Share on other sites More sharing options...
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