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

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{{WikipediaInfoAlt|en.wikipedia.org/wiki/TI-99/4A}}
{{WikipediaInfoAlt|TI-99/4A}}
{{DeviceAlerts}}
{{InfoboxDevice
{{InfoboxDevice
|Title = TI-99/4A
|Title = TI-99/4A
|Picture =  
|Picture =Texas Instruments TI-99-4A (transparent bg).png
|Release Year = 1979
|Release Year = 1981
|Mounting Technology = Through Hole, Sockets
|Mounting Technology = Through Hole, Sockets
|Capacitor Types = Aluminum Electrolytic
|Capacitor Types = Aluminum Electrolytic
Line 11: Line 10:
|Destructive Entry = No
|Destructive Entry = No
}}
}}
== Known Issues ==
===Symptom or Problem Encountered===
====Causes====
*Description of cause
====Solutions====
*Solution to the problem
== Disassembly Notes ==
Warnings or tips to disassemble the device
== Original Parts ==
== Original Parts ==


Line 47: Line 33:
!Series
!Series
|-
|-
|C7
|C7, C10
|1
|2
|0 µF
|47 µF
|
|16 v
|THT
|THT
|6mm
|6mm
Line 75: Line 61:
|C9
|C9
|1
|1
|
|3300 µF
|
|35 v
|THT
|THT
|22mm
|22mm
Line 83: Line 69:
|85 °C
|85 °C
|Electrolytic
|Electrolytic
|
|Nichicon
|(M)
|(M)
|-
|-
|C10
|C12
|1
|1
|47 µF
|4.7 µF
|16 v
|50 v
|THT
|THT
|
|6mm
|
|12mm
|Axial
|Axial
|
|85 °C
|Electrolytic
|Electrolytic
|Nichicon
|Nichicon
|
|SE(M)
|-
|-
|
|C15
|
|1
|
|470 µF
|
|12 v
|
|THT
|
|12.5mm
|
|24mm
|
|5mm
|
|105 °C
|
|Electrolytic
|
|Nippon Chemi-Con
|CERX
|}
|}


=== Basic PCB Name ===
=== Main Board ===
''Note model numbers and board revisions here''
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".''
 
[[File:TI-99-4A Main Board Label.jpg|alt=TI-99-4A Main Board Label|left|thumb|TI-99-4A Main Board Label]]
 
 
 
 
 
 
 
 
{| class="wikitable sortable"
{| class="wikitable sortable"
|+Capacitor [[Capacitor Specifications|Specifications]] and  [[Part Footprints|Footprint]] Information
|+Capacitor [[Capacitor Specifications|Specifications]] and  [[Part Footprints|Footprint]] Information
Line 129: Line 126:
!Series
!Series
|-
|-
|
|C1, C2, C7
|
|3
|0 µF
|100 µF
|
|16 v
|
|THT
|
|8mm
|
|16mm
|
|Axial
|0 °C
|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.
[[File:TI-99-4A Main Board.jpg|alt=TI-99-4A Main Board|left|frameless|TI-99-4A Main Board with electrolytic capacitor designations. ]]


==Replacement Parts==
==Replacement Parts==
===Basic PCB Name===
 
=== Power Supply ===
{| class="wikitable sortable"
|+Capacitors
! RefDes
! Qty
! Compatible Part Number
! Order Links
|-
|C7, C10
|2
|476TTA016M
|[https://www.digikey.com/en/products/detail/cornell-dubilier-illinois-capacitor/476TTA016MSD/5964383 DigiKey] [https://www.mouser.com/ProductDetail/CDE-Illinois-Capacitor/476TTA016M?qs=3tP%252BN51vMXdawNdOcuVCrQ%3D%3D Mouser]
|-
|C8
|1
|108TTA025M
|[https://www.digikey.com/en/products/detail/cornell-dubilier-illinois-capacitor/108TTA025M/5343993?s=N4IgTCBcDaIIwAYAcAVFBBBYCsBZEAugL5A DigiKey] [https://www.mouser.com/ProductDetail/CDE-Illinois-Capacitor/108TTA025M?qs=3tP%252BN51vMXdOwo41euK5LQ%3D%3D Mouser]
|-
|C9
|1
|338TTA035M
|[https://www.digikey.com/en/products/detail/cornell-dubilier-illinois-capacitor/338TTA035M/5344060?s=N4IgTCBcDaIMxwBwBVkEEAMcCsBZEAugL5A DigiKey] [https://www.mouser.com/ProductDetail/Cornell-Dubilier-CDE/338TTA035M?qs=3tP%252BN51vMXcX7WpbB043mQ%3D%3D Mouser]
|-
|C12
|1
|475TTA050M
|[https://www.digikey.com/en/products/detail/cornell-dubilier-illinois-capacitor/475TTA050M/5412738?s=N4IgTCBcDaICwHYCsAVFBBADEzBZEAugL5A DigiKey] [https://www.mouser.com/ProductDetail/Cornell-Dubilier-CDE/475TTA050M?qs=3tP%252BN51vMXdn7LI1ODkIcw%3D%3D Mouser]
|-
|C15
|1
|EEU-FR1V471LB
|[https://www.digikey.com/en/products/detail/panasonic-electronic-components/EEU-FR1V471B/2504091 DigiKey] [https://www.mouser.com/ProductDetail/Panasonic/EEU-FR1V471LB?qs=n1SRcuzDZT29cYaqooxsEQ%3D%3D Mouser]
|}
 
=== Main Board ===
{| class="wikitable sortable"
{| class="wikitable sortable"
|+Capacitors
|+Capacitors
Line 152: Line 220:
! Order Links
! Order Links
|-
|-
|
|C1, C2, C7
|
|3
|
|107TTA025M
|[https://www.digikey.com/ Digikey]
|[https://www.digikey.com/en/products/detail/cornell-dubilier-illinois-capacitor/107TTA025M/5343978?s=N4IgTCBcDaIIwAYDsAVFBBBYCsBZEAugL5A DigiKey] [https://www.mouser.com/ProductDetail/Cornell-Dubilier-CDE/107TTA025M?qs=3tP%252BN51vMXf2HTCReIRm4Q%3D%3D Mouser]
|-
|C3
|1
|106TTA035M
|[https://www.digikey.com/en/products/detail/cornell-dubilier-illinois-capacitor/106TTA035M/5410705 DigiKey] [https://www.mouser.com/ProductDetail/CDE-Illinois-Capacitor/106TTA035M?qs=3tP%252BN51vMXfV%2FQIgVrRM3w%3D%3D Mouser]
|-
|C4, C5, C6, C8, C9
|5
|226TTA035M
|[https://www.digikey.com/en/products/detail/cornell-dubilier-illinois-capacitor/226TTA035M/5411671 DigiKey] [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 ==
 
* [https://www.youtube.com Videos or other things that might be helpful to check out]
 
== References ==
<references />


[[Category:WorkNeeded:General]]
[[Category:WorkNeeded:General]]
[[Category:WorkNeeded:OriginalParts]]
[[Category:WorkNeeded:OriginalParts]]
[[Category:WorkNeeded:ReplacementParts]]
[[Category:Computer]]
[[Category:Microcomputer]]
[[Category:Texas Instruments]]
[[Category:1980s]]

Latest revision as of 23:06, 18 February 2024

For more information, see this article's corresponding Wikipedia page: TI-99/4A.
TI-99/4A
Preliminary Information
Release Year 1981
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 DigiKey Mouser
C8 1 108TTA025M DigiKey Mouser
C9 1 338TTA035M DigiKey Mouser
C12 1 475TTA050M DigiKey Mouser
C15 1 EEU-FR1V471LB DigiKey Mouser

Main Board

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

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