repetto74 Posted October 18, 2017 Share Posted October 18, 2017 Hi Guys, I have troubleshooted a faulty PAL TI99/4A and luckily I had another working machine to test by swapping the IC's. The faulty TI99/4A gives a black screen with a continuous pitch sound. It appeared that one of the two ROM chips is faulty, when swapping this rom into the working machine I have exactly the same problem. The ROM is the one sitting on the left of the two scratchpad Ram IC's and labelled : 8228 C71077 My question is to know the best action to replace this ROM. Is it affordable buying one or can it be replaced with any compatible Eprom ? I do have a programmer so in case this can be done I would like to have a guideline on how to proceed :-) Many thanks! Rick Quote Link to comment Share on other sites More sharing options...
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