Re: Idea...

[toddpw@bradbert.ugcs.caltech.edu (Todd P. Whitesel)]

Cyrus Roton <croton@ridgecrest.ca.us> writes:

>>  (is it a coincidence that SCSI allows up to seven devices?!).
>>
>No, not a coincidence. Three data lines allow eight device codes 
>(from zero to seven). Four data lines would have allowed sixteen codes, 

SCSI actually allows eight devices -- one per bit of the data bus, which
is used to assert requests during the arbitration phase. On a standard
SCSI implementation, the host machine must be counted as a device, hence
seven other devices may be added.

>tend to one tenth as fast as parallel communications. A SCSI interface to 
>a network would require a parallel-to-serial converted, and all that 
>speed would be lost.

what		bits	Mhz	speed
----		----	---	-----
Apple bus	8	1	1.00 MB/s
Ethernet	1	10	1.25 MB/s

Who's losing speed?

Todd Whitesel
toddpw @ ugcs.caltech.edu