Apr 17,2021
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  • Hello. I have not been able to get this cartridge to work. Could U1 be a 74LS379?

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  • what are the part numbers for U1 and U2? Any info on this build?

    Gabriel Delgadillo 2022-06-14 09:59:50Reply

    i found the following on the net, u2 is a 27cxxxx rom, u1 is 74hcxxx, the rear pads are here: http://facele.eu/ti-museum/ti-99/ti-99-4a-4

    Fabrizio Corpetti 2022-06-14 19:44:27Reply

    U1=74ls378

    Gabriel Delgadillo 2022-06-17 08:24:49Reply

    and the rest of components Cx and Rx?

    Engineer 2022-09-20 22:04:10Reply

    Hello , i search for Rx but i can t found a solution , are you sure for the 378 all the pcb use 379 ?

    Engineer 2022-09-20 22:22:09Reply

    C1 1uF C_1210 C2 1nF C_1210 C3 100nF C_1210 R1 68 ohm R_1210 R2 2,2 kohm R_1210

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