V3/usr/man/man2/csw.2

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including files from this version of Unix. 
.pa 1
.he 'CSW (II)'7/29/72'CSW (II)'
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NAME		csw -- read console switches
.sp
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SYNOPSIS	sys csw	/ csw = 38. not in assembler
.br
(value of csw in r0)
.br
(value of buttons in r1)
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DESCRIPTION	The setting of
the console switches is returned in r0.
The setting of the
external buttons is returned in r1.
.a
The return is synced to
a 30 CPS clock for graphical applications.
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SEE ALSO	--
.sp
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DIAGNOSTICS	none
.sp
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BUGS		Currently the buttons are unavailable.