Save and load: CATD

       Name: CATD                                                    [Show more]
       Type: Subroutine
   Category: Save and load
    Summary: Load disc sectors 0 and 1 to &0E00 and &0F00 respectively
  Deep dive: Swapping between the docked and flight code
    Context: See this subroutine in context in the source code
 References: This subroutine is called as follows:
             * DEATH2 calls CATD
             * Elite loader (Part 1 of 3) calls CATD
             * LOMOD calls CATD
             * TT110 calls CATD


 This routine is copied to &0D7A in part 1 above. It is called by both the main
 docked code and the main flight code, just before the docked code, flight code
 or ship blueprint files are loaded.


.CATD

 DEC CATBLOCK+8         \ Decrement sector number from 1 to 0
 DEC CATBLOCK+2         \ Decrement load address from &0F00 to &0E00

 JSR CATL               \ Call CATL to load disc sector 1 to &0E00

 INC CATBLOCK+8         \ Increment sector number back to 1
 INC CATBLOCK+2         \ Increment load address back to &0F00

.CATL

 LDA #127               \ Call OSWORD with A = 127 and (Y X) = CATBLOCK to
 LDX #LO(CATBLOCK)      \ load disc sector 1 to &0F00
 LDY #HI(CATBLOCK)
 JMP OSWORD