BeebMaster - Econet Clocks


Econet Clocks



Pre-BBC Micro
Econet Clock		 BBC Micro Clock Acorn Clock type 1
Acorn Clock type 2 SJ Research Clock Acorn FileStore
E01 Clock
Acorn Stacking FileStore
E01S Clock		 SJ Research Econet Bridge Clock SJ Research BEN Clock
American Clock InterClock BeebMaster Econet Clock Issue 1 BeebMaster Econet Clock Issue 2


The purpose of an Econet Clock is not to tell the time. It is to transmit a signal to all stations on the network to allow them to synchronise the transmission and receipt of data. Without an Econet Clock, the network will not function.

The speed of the clock setting determines the speed of data transfer along the network. The are two phases to the clock's timing, the Mark and the Space. The Mark and the Space, when added together, produce the Period which indicates the speed of the clock.

Clock speeds are determined in microseconds and the mark duration should be lower than the space duration. In some clocks, the space is expressed as a multiple of the mark so it is impossible to set the space shorter than the mark. In other clocks the mark and space can be set independently so it would be possible to set the space shorter than the mark.

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