> On Fri, 10 Feb 1995 11:25:42 +0000 (GMT), Nigel J Kettlewell said: > > 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? > > This is what Simon proposed some time ago (that is, adding a souped up CPU > and a chunk of memory, neither of which the ASIC knows anything about, and > some kind of linkage which allows the new CPU to write to the Sam's memory > if it wants (which it has to do in order to display a picture)). > > imc
And as soon as we can get hold of that damned 20MHz Z80, we'll build one too... the only problem I can see is the Dynamic RAM refresh circuitry. Anyone know any reference text that's perfect for the job? Simon
