Atari 400 Technical Reference Manual page 232

~8
STICKO - STICK3 [0278.4J -- Driving controller sense
The 4 driving controller sense variables contain an encoded
rotation <position) sense value, as shown below:
7 6 5 432 1 0
+-+-+-+-+-+-+-+-+
1000 0 1 llvall
+-+-+-+-+-+-+-+-+
where a clockwise rotation of the controller produces the following
continuous se~uence of four values <shown in hexadecimal):
OF,OD,OC,OE,OF,OD,.~ .....
and a counterclockwise rotation of the controller produces the
following continuous sequence of four values:
OF,OE,OC,OD,OF,OE •.......
~9
STRIGO - STRIG3 [0284,4J -- Driving trigger sense
The four driving trigger sense variables each contain a single bit
indicating the position of the driving tTigger as shown below:
7 6 5 432 1 0
+-+-+-+-+-+-+-+-+
:0 0 0 0 0 0 O:TI
+-+-+-+-+-+-+-+-+
where: T
= 0
indicates trigger pressed.
K. DISK FILE MANAGER
See Section 5 for information relating to the Disk File Manager.
Kl FMSZPG* [0043,7J -- FMS reserved space
FMSZPG is the reserved space in the database for the variables shown
below; the names associated with K2 through K5 are not in the svstem
e~uate file.
K2 ZBUFP* [0043,2J -- Buffer pointer
K3 ZDRVA* [0045,2J -- Drive pointer
K4 ZSBA* [0047,2J -- Sector buffer pointer
OPERATING SYSTEM C016555 -- Appendix L
247