I always wondered about that. This is a revelation for me. I still remember SASI and SCSI drives, And the switch to serial methods puzzled me. Of course it’s more convenient.
On Sun, May 5, 2019 at 10:37 Ralph DiMola via use-livecode < use-livecode@lists.runrev.com> wrote: > This not a limit without real world consequences... > > I was hamstrung with the 1 foot per nanosecond limitation back in 1979. We > had a CGI rack with a 6 foot backplane clocked at 25 MHz Of course 1 > foot/ns > is a theoretical limit. Although we had 40 ns we ran into not only the time > it took to get from the bottom(CPU) to the top (MPU) of the 6 foot > backplane > but keeping 32 parallel bits in sync. We had so many errors that we had to > design a repeater in the center of the backplane to re-sync the bits. The > challenges of keeping parallel data in sync in a copper medium is why > parallel SCSI and IDE hard drives were jettisoned for high speed serial. > With present technology it's easier, cheaper and more reliable to use ultra > fast serial rather than slower 32 or 64 bit wide parallel busses to achieve > the same effective data rate. This is another one of those real world > things > that the casual bystander finds hard or refuses to believe. The fact that > serial is better that parallel is not intuitive but true. > > Ralph DiMola > IT Director > Evergreen Information Services > rdim...@evergreeninfo.net > > -----Original Message----- > From: use-livecode [mailto:use-livecode-boun...@lists.runrev.com] On > Behalf > Of Mark Wieder via use-livecode > Sent: Friday, May 03, 2019 9:47 PM > To: use-livecode@lists.runrev.com > Cc: Mark Wieder > Subject: How big is a nanosecond? > > https://www.youtube.com/watch?v=JEpsKnWZrJ8 > > -- > Mark Wieder > ahsoftw...@gmail.com > > _______________________________________________ > use-livecode mailing list > use-livecode@lists.runrev.com > Please visit this url to subscribe, unsubscribe and manage your > subscription > preferences: > http://lists.runrev.com/mailman/listinfo/use-livecode > > > _______________________________________________ > use-livecode mailing list > use-livecode@lists.runrev.com > Please visit this url to subscribe, unsubscribe and manage your > subscription preferences: > http://lists.runrev.com/mailman/listinfo/use-livecode > -- -- Stephen Barncard - Sebastopol Ca. USA - mixstream.org _______________________________________________ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode
