TI 990 architecture / was Re: TI-99/4A Floppies
bfranchuk at jetnet.ab.ca
Wed Oct 3 14:04:51 CDT 2007
Peter C. Wallace wrote:
> The registers-in-memory architecture might be suitable for a FPGA CPU
> where BlockRAM (as system memory) is almost as fast as registers. Why
> not have registers in memory instead of simulatiing it badly (and
> expensively power wise) via caching, that is, why move data if you dont
> have to?
Simple registers are expensive. Look at the PDP-5. This is the 1960's
when most architectures where developed. Even the PDP-10 I think
was designed to use core memory as registers unless you want the
optional module for F/F registers.
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