Posted By
gerliczer
on 2017-02-19
01:36:45
|  Re: DRAM regeneration at C+4/16
You're welcome. The number of refresh reads necessary depends on actual DRAM organisation. AFAIK, 4164 requires 7 bit refresh scheme (maybe $FF80-$FFFF), however 41256 or 4464 requires 8 bit refresh (and 44256, imagine this, requires 9 bits). How actually that specific TED mode works is nowhere written in detail, or at the least I never met any such description. You should attach a logic analyser and check how it exactly works. Or take a look at the plus4emu sources. Maybe IstvanV made proper measurements to base the emulated TED behaviour on.
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