> > On Fri, 10 Feb 1995 10:59:14 +0000 (GMT), Nigel J Kettlewell said: > > > This is true of just about any processor, though - accessing memory is > > > the slowest thing it can possibly do (barring floating point, perhaps) > > > > True. However, in this case the ASIC makes the problem worse by limiting > > access to one every 4 6MHz cycles even though the Z80 can manage one every > > 3 cycles (which is I think still five times as long as the RAM's access > > time). > > OK, so how about putting in your own RAM as well as a new CPU? Memory's > cheap, despite what SAMCo et al used to charge for it. That way, surely you > could stop the CPU caring what the ASIC says about RAM? > > I'm probably wrong, as I've not really done much SAM stuff for _ages_.
THat's the idea behind /my/ accelerator -- it has a faster processor *and* superfast shadow RAM that only refers back to the ASIC when it's writing data. Simon
