Command line arguments can be passed to main()
after BLOAD. Since this is not
supported by BASIC, the following syntax was chosen:
]CALL2051:REM ARG1 " ARG2 IS QUOTED" ARG3 "" ARG5
main
is the program name.These are defined to be OpenApple + number key.
The runtime for the enhanced Apple //e uses routines marked as .CONDES
type interruptor
for ProDOS 8 interrupt handlers. Such routines must be
written as simple machine language subroutines and will be called automatically
by the interrupt handler code when they are linked into a program. See the
discussion of the .CONDES
feature in the
assembler manual.
The function
dio_open() has the single parameter
drive_id
to identify the drive to be opened. Therefore an Apple II
slot and drive pair is mapped to that drive_id
according to the formula
drive_id = (slot * 2) + (drive - 1)
so that for example slot 6 drive 1 is mapped to drive_id
12.
The function dio_open() succeeds only if a formatted disk is present in the drive. However intentionally no check is performed on the presence of a ProDOS 8 disk. Therefore access to all standard 16-sector disks (as for instance DOS 3.3) is possible.