Circuit details for the internal 512K RAM upgrade

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Pr0f
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Circuit details for the internal 512K RAM upgrade

Postby Pr0f » Wed Feb 14, 2018 9:01 am

Hi - Does anyone have any circuit details for the internal 512K dynamic RAM upgrade that was done with piggy back 256K DRAM chips?

Specifically I am after the bit that drives CAS and multiplexes the aditional address pin on the dram chips...


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