Posted By
gerliczer
on 2016-09-22
15:43:02
|  Re: What would I do differently in the Plus/4
@MMS: SRAM from the era: https://www.google.hu/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&cad=rja&uact=8&ved=0ahUKEwigi4P-2aPPAhXEXCwKHTC_BEAQFggjMAE&url=http%3A%2F%2Fcs.smith.edu%2Fdftwiki%2Fimages%2Fa%2Fab%2F2114_datasheet.pdf&usg=AFQjCNEDeRWdPBAPLbihnrGglueX6JYOMw. I think this was the general type they used in the C64. Unfortunately, it is not such an easy task to speed up any 8 bit machines as dropping in faster RAM. You need to circumvent a lot of hardwired parts of the system, and replace them with new components or even a complete new system design.
@JamesD: Actually, it doesn't matter that SRAM needs no refresh cycles. TED, VIC-II, CRTC 6845 and similar ICs have integrated memory refresh function that is usually cannot be turned off. Z80 based systems work with the refresh feature integrated into it. So, even if the DRAM memory is replaced with SRAM in these machines, there's no benefit because the memory will still be refreshed.
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