Posted By
gerliczer
on 2021-09-06
12:14:06
|  Re: Sidekick264 - software defined cartridge
@Frenetic: There is one thing with the Sound Expander for the C64 I always had hard to accept: the necessity of having three addresses for accessing the registers. I do understand that one is for selecting the YM3812's register for I/O, one is for writing into the selected register and the third is for reading from said register. But couldn't the last two have been combined into one? The R/W signal on the Expansion Port always marks the direction of I/O. What did they gain constructing the device that way? And is it really necessary to replicate that for the 264 series machines or could it be done in a way that's more sparing with address space resources, as in two addresses and the second is bidirectional?
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