Re: /etc/disktab on vax
Mouse <[email protected]>
| Newsgroups | gmane.os.netbsd.ports.sparc64,gmane.os.netbsd.ports.vax |
|---|---|
| Message-ID | <[email protected]> |
>> IIRC the Z80 required a 4x clock, so a 20MHz Z80 is about as fast as >> a 5MHz 8080 or 8085. > It's not that the Z80 "requires a 4x clock", but four T-states (clock > cycles) make up one machine cycle. [...] Also - and this memory is seriously fuzzy, so it could be entirely wrong - I think the 8080 required a two-phase clock, so that there are four, not two, state changes on the clock pins per clock cycle. This could easily turn into "requires a 4x clock", so if my memory is right and the Z80 copied that particular bit of design.... /~\ The ASCII Mouse \ / Ribbon Campaign X Against HTML [email protected] / \ Email! 7D C8 61 52 5D E7 2D 39 4E F1 31 3E E8 B3 27 4B