> > Basically, see it at the show... and remember: the release version should > > run at 18Mhz (if you go for the cheapo one). > > I asume that you can turn it off?!
Ummm.... the easiest way to do that is to remove it from the back of the machine. We've also got a couple of other problems - programs which rely on the R register for a random number generator, for example, won't work any more :( We're working on it - remember, this is just the protoprototype :) > > > > Interesting facts found out during development: > > > > 1) NMOS Z80's output 0 when you do ED 71 (the undocumented OUT (C),0 > > instruction) > > 2) CMOS Z80's output &FF when you do the same... good way of determining > > what type you're using? > > Well, if it is undocumented you never know what the future brings. > But my guess is that you get the result you get because the NMOS > probably 'pulls' the databus up, whilce CMOS 'pulls' it down > in order to make something readable. The instruction does not > actually generate anything. Surely the other way around? Actually, on the Z380 that instruction takes another operand, so you get OUT (C),n (format: ED 71 nn) > > 3) Z380's ... well... that'd be telling... > > What about ARM? :) Wellll... we'll see :) > > 4) The ASIC seems to be able to manage asynchronous IOs perfectly well... > > which is surprising to say the least. > > Does Brucey know about this? Not yet, but then, cadging his phone number out of Chris White is like pulling teeth without anaesthetic. Simon
