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MACHINE PARAMETERS
SynchroNet ES/2 Service Manual
SERVO PARAMETERS
The servo system uses a 24-bit number to set the output frequency of a programmable divider.
There are three possible servo outputs for a machine, these are FILM, FM and DC. For a given
SERVO VALUE, the frequency of the FILM output is:
8000000
VALUE
For a tach+dir output, or half this for a bi phase output. More about FILM output later.
The frequency of the FM output is calculated as:
æ 8000000 ö
÷÷ * 96
ç
è VALUE ø
SVODIV
Thus with SVODIV set to 2 and NOMPLY = $9C40 we get the usual 9600Hz FM servo output.
SLOLIM $1000/1/2
This 24 bit number determines the slowest speed at which the ES/2 will attempt to make the
machine run in external speed control. The number is a measure of the servo period and so the
larger it is the slower the machine will run.
NOMPLY $1003/4/5
This 24-bit number determines the nominal play speed for machine under external speed control. It
may be modified by the kernel to reflect the speed at which the machine last locked to the timeline.
FSTLIM $1006/7/8
This 24-bit number determines the fastest speed at which the ES/2 will attempt to make the
machine run in external speed control.
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