58368



GET BYTE vector
PUT BYTE vector
GET STATUS vector
SPECIAL vector
Jump to handler initialization routine (JMP LSB/MSB)

The device tables in location 794 ($31A) point to the particular
vector(s) used in each appropriate table. In each case, the 6502 X
register is used to point to the originating IOCB.

58368          E400           EDITRV
     Screen Editor (E:) entry point table.

58383          E40F           ....
     If you PEEK here and get back 56, then you have the older "A"
     version of the OS ROMs. If you get back zero, then you have the
     newer "B" version that was released in January 1982. The "B"
     version fixes some minor bugs, including the device time-out
     problems, enables POKEY timer four, and provides a vector for
     BREAK key interrupts. See Appendix 4.

58384          E410           SCRENV
     Display handler (television screen) (S:).

58400          E420           KEYBDV
     Keyboard handler (K:).

58416          E430           PRINTV
     Printer handler (P:).

58432          E440           CASETV
     Cassette handler (C:).

---------------------------------------------------------------------------
Locations 58448 to 58533 ($E450 to $E4A5) are more vectors: those to
location 58495 ($E47F) are Jump vectors, those from 58496 to 58533
($E480 to $E4A5) are the initial RAM vectors.

58448          E450           DISKIV
     Disk handler initialization vector, initialized to 60906 ($EDEA).

58451          E453           DSKINV
     Disk handler (interface) entry; checks the disk status. Initialized
     to 60912 ($EDF0).

58454          E456           CIOV
     Central Input/Output (CIO) utility entry. CIO handles all of the
     I/O operations or data transfers. Information placed in the
     IOCB's tells CIO what operations are necessary. CIO passes this
     information to the correct device driver routine and then passes
     control to the Device Control Block (DCB). This in turn calls up