SC: > > Just talked to Zilog UK... estimated cost of a 20MHz accelerator for the > > sam is now around 80/90 UKP. FT: > Hmmm....sounds very interesting.... > > > > > AND... if you don't mind losing a little compatibility (the R register > > springs to mind, and some ports), we could also use a 33MHz Z180 ... > > What are the gains in this case? What's the price difference? > Etc.? ;) > Hang on... isn't that rather similar to the Z800 series, in fact isn't it just the same chip under a different name? I do know that the Z8108 (ne Z180?) uses clock doubling and quadrupling in relation to the bus clock.. so why not just drop it in on a daughter board over the old Z80B and have a 24Mhz version? Surely this is much simpler from a programming point of view since you don't need to worry about any external ports etc. that you get if you use it as a copro. In this case, you lose R register compatibility since it no longer uses the R register for refresh purposes, having a seperate on board refresh generator instead. The R register is therefore no longer incremented, and is merely used as a general purpose register. I believe this is more than made up for by system and user modes, 256 bytes of cache ( or look ahead ) memory, 32 bit commands (double word), not to mention those lovely MULT and DIV commands...
DMZ === PS OK then, is anybody NOT there? :)
