Texas Instruments Home Computer 99/4A: Difference between revisions

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(Added main board replacement table.)
(Finished replacement parts for main board and added BOM)
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|-
|-
|C4, C5, C6, C8, C9
|C4, C5, C6, C8, C9
|4
|5
|22 µF
|22 µF
|16 v
|16 v
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|C1, C2, C7
|C1, C2, C7
|3
|3
|
|107TTA025M
|
|[https://www.mouser.com/ProductDetail/Cornell-Dubilier-CDE/107TTA025M?qs=3tP%252BN51vMXf2HTCReIRm4Q%3D%3D Mouser]
|-
|-
|C3
|C3
|1
|1
|
|106TTA035M
|
|[https://www.mouser.com/ProductDetail/CDE-Illinois-Capacitor/106TTA035M?qs=3tP%252BN51vMXfV%2FQIgVrRM3w%3D%3D Mouser]
|-
|-
|C4, C5, C6, C8, C9
|C4, C5, C6, C8, C9
|4
|5
|
|226TTA035M
|
|[https://www.mouser.com/ProductDetail/Cornell-Dubilier-CDE/226TTA035M?qs=3tP%252BN51vMXc11%252BNWGOKmzw%3D%3D Mouser]
|}
|}
''If parts are not available or different selection is preferred, you can use the values in the [[#Original_Parts|Original Parts]] section to perform a parametric search.''
''If parts are not available or different selection is preferred, you can use the values in the [[#Original_Parts|Original Parts]] section to perform a parametric search.''


===Kits===
===Kits===
* Digikey BOM: https://www.digikey.com/
* Mouser BOM: https://www.mouser.com/ProjectManager/ProjectDetail.aspx?AccessID=0cbfd92611


== Related Links ==
== Related Links ==

Revision as of 22:55, 4 January 2024

For more information, see this article's corresponding Wikipedia page: TI-99/4A.
TI-99/4A
Preliminary Information
Release Year 1979
Leak Risk Not Sure
Batteries None
Mounting Technology Through Hole, Sockets
Capacitor Types Aluminum Electrolytic
Destructive Entry No

Original Parts

Power Supply

4A/PS

NO

1049689-2

Capacitor Specifications and Footprint Information
RefDes Qty Capacitance Voltage Mount Diameter/Size Height Lead Spacing Temp Type Brand Series
C7, C10 2 47 µF 16 v THT 6mm 12mm Axial 85 °C Electrolytic Nichicon SE(M)
C8 1 1000 µF 25 v THT 13mm 26mm Axial 85 °C Electrolytic Nichicon SE(M)
C9 1 3300 µF 35 v THT 22mm 39mm Axial 85 °C Electrolytic Nichicon (M)
C12 1 4.7 µF 50 v THT 6mm 12mm Axial 85 °C Electrolytic Nichicon SE(M)
C15 1 470 µF 12 v THT 12.5mm 24mm 5mm 105 °C Electrolytic Nippon Chemi-Con CERX

Main Board

The main board of the TI-99/4A has very little silkscreening. The only permanent marking on the board are an unrecognizable symbol followed by "-24 (ET) 246".

TI-99-4A Main Board Label
TI-99-4A Main Board Label





Capacitor Specifications and Footprint Information
RefDes Qty Capacitance Voltage Mount Diameter/Size Height Lead Spacing Temp Type Brand Series
C1, C2, C7 3 100 µF 16 v THT 8mm 16mm Axial 85 °C Electrolytic Nichicon SE(M)
C3 1 10 µF 16 v THT 5mm 12mm Axial 85 °C Electrolytic Nichicon SE(M)
C4, C5, C6, C8, C9 5 22 µF 16 v THT 6mm 12mm Axial 85 °C Electrolytic Nichicon SE(M)

The reference designations used for the main board here are not official as there are no designations silkscreened onto the PCB. See the image of the main board for the designations.

TI-99-4A Main Board
TI-99-4A Main Board with electrolytic capacitor designations.





Replacement Parts

Power Supply

Capacitors
RefDes Qty Compatible Part Number Order Links
C7, C10 2 476TTA016M Mouser
C8 1 108TTA025M Mouser
C9 1 338TTA035M Mouser
C12 1 475TTA050M Mouser
C15 1 EEU-FR1V471LB Mouser

Main Board

Capacitors
RefDes Qty Compatible Part Number Order Links
C1, C2, C7 3 107TTA025M Mouser
C3 1 106TTA035M Mouser
C4, C5, C6, C8, C9 5 226TTA035M Mouser

If parts are not available or different selection is preferred, you can use the values in the Original Parts section to perform a parametric search.

Kits

Related Links

References

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