Make Trax Error

gameguy1957

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I've got a Make Trax that I'm finally getting around to testing. It powers up, first it comes up with a RAM Error 4C 40, then the screen scrolls completely red, and next it gives the code RAM Error 4D 40 over and over again.

When checking the schematics, 4C and 4D are not ram chips. 4C is a 74L500 and 4D is 74LS273.

Anyone know if 4C and 4D are actually bad like the test says or am I looking at the schematics wrong an it actually has a couple of bad ram chips?

Thanks,

-JM
 
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