DD_INTERFACE
Check for the disk drive interface
Low Level API
+3DOS Low Level API
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The following are the floppy disk driver routines. The unit number is 0…3 for the uPD765A. On the +3, unit 0 is drive A: and unit 1 is drive B:, or optionally, both A: and B: may be mapped onto unit 0. Units 2 and 3 are not used.
With the exception of DD_INTERFACE, none of these routines may be called if the floppy disk interface is not present.
All routines assume that interrupts are enabled on entry, and will still be enabled on exit.
DD_INIT
Initialise the disk driver
DD_SETUP
Setup disk parameters
DD_SET_RETRY
Set try/retry count
DD_READ_SECTOR
Read a sector
DD_WRITE_SECTOR
Write a sector
DD_CHECK_SECTOR
Check a sector
DD_FORMAT
Format a track
DD_READ_ID
Read a sector identifier
DD_TEST_UNSUITABLE
Check disk is suitable to write to
DD_LOGIN
Log in a new disk
DD_SEL_FORMAT
Select a standard format
DD_ASK_1
Check to see if unit 1 is present
DD_DRIVE_STATUS
Check drive status
DD_EQUIPMENT
Ask what type of drive
DD_ENCODE
Set copy protection encode routine
DD_L_XDPB
Initialise XDPB for a given format
DD_L_DPB
Initialise DPB for a given format
DD_L_SEEK
Seek to required track
DD_L_READ
Low level uPD765A read command
DD_L_WRITE
Low level uPD765A write command
DD_L_ON_MOTOR
Turn on motor
DD_L_T_OFF_MOTOR
Start motor off timeout
DD_L_OFF_MOTOR
Turn off motor
Last modified November 24, 2021: Low level operations (11836cf)