View source for Texas Instruments Home Computer 99/4A

{{WikipediaInfoAlt|TI-99/4A}}
{{InfoboxDevice
|Title = TI-99/4A
|Picture = 
|Release Year = 1979
|Mounting Technology = Through Hole, Sockets
|Capacitor Types = Aluminum Electrolytic
|Leak Risk = Not Sure
|Batteries = None
|Destructive Entry = No
}}
== Original Parts ==

=== Power Supply ===
''4A/PS''

NO

1049689-2
{| class="wikitable sortable"
|+Capacitor [[Capacitor Specifications|Specifications]] and [[Part Footprints|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".''

[[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"
|+Capacitor [[Capacitor Specifications|Specifications]] and  [[Part Footprints|Footprint]] Information
!RefDes
!Qty
!Capacitance
!Voltage
![https://caps.wiki/wiki/Part_Footprints Mount]
!Diameter/Size
!Height
!Lead Spacing
!Temp
![https://caps.wiki/wiki/Capacitor_Types 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
|4
|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==

=== Power Supply ===
{| class="wikitable sortable"
|+Capacitors
! RefDes
! Qty
! Compatible Part Number
! Order Links
|-
|C7, C10
|2
|476TTA016M
|[https://www.mouser.com/ProductDetail/CDE-Illinois-Capacitor/476TTA016M?qs=3tP%252BN51vMXdawNdOcuVCrQ%3D%3D Mouser]
|-
|C8
|1
|108TTA025M
|[https://www.mouser.com/ProductDetail/CDE-Illinois-Capacitor/108TTA025M?qs=3tP%252BN51vMXdOwo41euK5LQ%3D%3D Mouser]
|-
|C9
|1
|338TTA035M
|[https://www.mouser.com/ProductDetail/Cornell-Dubilier-CDE/338TTA035M?qs=3tP%252BN51vMXcX7WpbB043mQ%3D%3D Mouser]
|-
|C12
|1
|475TTA050M
|[https://www.mouser.com/ProductDetail/Cornell-Dubilier-CDE/475TTA050M?qs=3tP%252BN51vMXdn7LI1ODkIcw%3D%3D Mouser]
|-
|C15
|1
|EEU-FR1V471LB
|[https://www.mouser.com/ProductDetail/Panasonic/EEU-FR1V471LB?qs=n1SRcuzDZT29cYaqooxsEQ%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.''

===Kits===
* Digikey BOM: https://www.digikey.com/

== Related Links ==

* [https://www.youtube.com Videos or other things that might be helpful to check out]

== References ==
<references />

[[Category:WorkNeeded:General]]
[[Category:WorkNeeded:OriginalParts]]
[[Category:WorkNeeded:ReplacementParts]]
[[Category:1970s]]
[[Category:Computer]]
[[Category:Microcomputer]]
[[Category:Texas Instruments]]