Tandy 1000 SL Technical Reference Manual page 460

Innermost track r e s o l u t i o n :
609,
Min.
(10) If the value i n
i t e m (9) i s o u t of the s p e c i f i e d range, r e f e r t o i t e m
( 1 2 ) of "General method".
(11) Eject
t h e level d i s k .
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3448
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