On Oct 25, 2010, at 5:24 PM, Doug McNutt wrote: > > It's the last question that makes me do this. I had an IBM 024 punch in my > office that nobody else wanted because it didn't print the letters on the top > edge. The 026's did. It's really fun to check a FORTRAN deck for typos when > all you have to look at is the holes.
Which means it ought to be about 4 times as fun to check a COBOL deck for typos. > > But 3 GHz translates to a wavelength of 1/3 of a foot because the foot - a > metric unit now that the meter is defined in terms of the speed of light - is > the distance that light travels in a nanosecond. Those clocks you're talking > about would be a full cycle out of phase in two inches round trip if you > tried that on a memory bus. > > What the manufacturer really means is that you, the designer, give me > something slower, a few MHz, on a pin and I'll multiply it up to a 3 GHz > clock that stays wholly inside the microprocessor. There we're dealing with > much shorter path lengths. > > The time delay in a wave guide is still limited by the speed of light. Bigger > and longer doesn't get better. The time delay in a wave guide is limited by the speed of light. The time delay in a wire is limited by the propagation velocity which is slower, often around 2/3 C. Clark Martin Redwood City, CA, USA Macintosh / Internet Consulting "I'm a designated driver on the Information Super Highway" -- You received this message because you are a member of G-Group, a group for those using G3, G4, and G5 desktop Macs - with a particular focus on Power Macs. The list FAQ is at http://lowendmac.com/lists/g-list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/g3-5-list
