See Section 5 for a discussion of the resident Diskette Handler.
C1 BUFADR* [0015,2] -- Data buffer pointer
BUFADR acts as a temporary page zero pointer to the current diskette buffer.
C2 DSKTIM* [0246,1] -- Disk format operation timeout time
DSKTIM contains the timeout value for SIO calling sequence variable DTIMLO (see section 9). DSKTIM is set to 160 (which represents a 171-second timeout) at initilization time, and is updated after each diskette status request operation. It contains the value returned in the third byte of the status frame (see Section 5). Note that all diskette operations other than format have a fixed (7) second timeout, established by the Diskette Handler.