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GEMINI repair E4002 / TIA full pinout comparation


Zak

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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

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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

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  • 2 weeks later...
  • 1 year later...
  • 2 weeks later...
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

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  • 4 months later...
  • 2 weeks later...
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.

 

IMG-20221222-WA0043.jpg

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  • 2 months later...
4 hours ago, dognaldo said:

I've been using it for quite some time now. Works without problems.

 

398327561_photo_2023-04-01_14-12-19(2).thumb.jpg.b6f6dd1cfd780bc846bce919ede3debb.jpgphoto_2023-04-01_14-12-19.thumb.jpg.4e72b66b26ee47a05d89546a39475e2f.jpg1794949685_photo_2023-04-01_14-12-18(2).thumb.jpg.17333d2977bf670163ec3e44c1a63883.jpgphoto_2023-04-01_14-12-18.thumb.jpg.013cfb3e52449369d6d87042a72a4362.jpg960647221_photo_2023-04-01_14-12-19(4).thumb.jpg.c539c7113348bb12a8c582c3d6db297c.jpg1575099460_photo_2023-04-01_14-12-19(3).thumb.jpg.ae528fb49a4af92a3802ad9bb7c6be60.jpg

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

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