Sanyo MBC-550 Series User Manual page 261

diskett status variable in the data
segment of this module
0 Successful operation (AH=0 on return)
Failed operation (AH has error reason)
CY =
CY = 1
For READ/V/RITE/VERIFY
DS,BX,DX,CH,CL preserved
NOTE: (1) If an error is reported by the diskette code,
the appropriate action is to reset the diskette,
then retry the operation. On read acceses, no
motor start delay is taken so that three retries
are required on reads to ensure that the problem
is not due to motor start-up.
(2) Inside the ( ) shows the Registor and data is
in hexadecimal.
5-20