davidm@uunet.UU.NET (David S. Masterson) (03/20/90)
I'm a little curious for comparison sake... Does anyone have a ballpark figure as to the Maximum Transfer rate and Sustainable Transfer rate for the Amiga bus? Just for comparison, what is the IBM PC bus speed? -- =================================================================== David Masterson Consilium, Inc. uunet!cimshop!davidm Mt. View, CA 94043 =================================================================== "If someone thinks they know what I said, then I didn't say it!"
daveh@cbmvax.commodore.com (Dave Haynie) (03/21/90)
In article <CIMSHOP!DAVIDM.90Mar19165457@uunet.UU.NET> cimshop!davidm@uunet.UU.NET (David S. Masterson) writes: >I'm a little curious for comparison sake... >Does anyone have a ballpark figure as to the Maximum Transfer rate and >Sustainable Transfer rate for the Amiga bus? The maximum data transfer rate, which is also the sustainable transfer rate, is about 3.75 Megabytes/second. Since the bus supports multiple masters, this means that a DMA device can transfer data from an I/O port, such as SCSI, to memory, at the full 3.75 Megabytes/second. >Just for comparison, what is the IBM PC bus speed? In theory, the PC-AT bus can go at 4 MB/s. However, in practice, the throughput is actually a maximum of 2 MB/s. Without multimaster capability, the bus requires the PC-AT's DMA controller (which takes additional wait states) or CPU to effect transfers across the bus. In a sense, most of the things done on the PC bus work much like the non-DMA things done on the Amiga bus. Not all PC buses will run at 8MHz, and while some are clocked faster, most things are standardized at either the 4.77MHz rate of the original PC or the de-facto AT standard of 8MHz. The AT bus has a number of other defects avoided by the Amiga bus. >David Masterson Consilium, Inc. -- Dave Haynie Commodore-Amiga (Systems Engineering) "The Crew That Never Rests" {uunet|pyramid|rutgers}!cbmvax!daveh PLINK: hazy BIX: hazy Too much of everything is just enough