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  • TI-99/4A

VDP RAM wrong

If you have a problem with the 4116 video RAM and you don't have the oscilloscope, you can basically use these photos to find the faulty RAM. This help is useful if one of the RAMs has the DOUT pin locked (broken ram).

vdp ramWiring diagram. 

u102u103u104u105

u106u107u108u109

 

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