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TI99/4A DC Power Board

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Replaces TI99/4A power board to allow it to be powered with a 16v to 18v DC Power Supply

Make sure to check the pinout on your original power board, the pinout is the same as my (UK) model but i've heard there are different pinouts on other models, so you may need to make an adapter cable

in the UK i've had success here:

The Original TI99/4A Power Board is REALLY thin, I made this at 1.6 and it fit, but there was a little fighting with the case. You might want to see if you can get it made thinner, although the ground plane does make that harder.

I've successfully made a board with 0.8 thickness on JLCPCB and it works fine



TI99/4A DC Power Board

TI99 DC Power Board


ID Name Designator Footprint Quantity
1 Barrel Jack P1 HDR-1X2/2.54 1
2 Header-Male-2.54_1x4 TI99 DIP-1X4P-3.96MM-SK 1
3 Slide_Switch U1 SLIDE_SWITCH 1
4 LED-5MM LED1 LED-5MM/2.54 1
5 V7812-1000 U5 V7812W-500 1
6 22uf 16v C9,C5 CAP-D5.0×F2.0 2
7 10uf 25v C8,C7 CAP-D5.0×F2.0 2
8 220 R1 L_AXIAL-0.4 1
9 10uf 50v C1,C3 CAP-D5.0×F2.0 2
10 V7805-2000 U3,U4 V78031500 2


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