Tandy 1000 SL Technical Reference Manual page 150

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PROGRAMMABLE INTERRUPT T I M I N G AND D E S C R I P T I O N S
M u s t meet I n t e l
8 2 5 9 A . A n y
d i f f e r e n c e s m u s t
be s p e c i f i e d .
PROGRAMMABLE TIMER T I M I N G AND D E S C R I P T I O N S
M u s t meet I n t e l
8 2 5 4 - 5 .
A n y
d i f f e r e n c e s m u s t be s p e c i f i e d .
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