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⌂ ∞ Elite on the BBC Micro and NES

Loader: PROT4

[BBC Micro disc version, Loader 3]

       Name: PROT4                                                   [Show more]
       Type: Subroutine
   Category: Loader
    Summary: Fetch the address of the keyboard translation table before
             carrying on with the copy protection

    Context: See this subroutine in context in the source code
 References: This subroutine is called as follows:
             * Elite loader (Part 1 of 3) calls PROT4




IF _SRAM_DISC

.PROT4

 LDA #172               \ Call OSBYTE 172 to read the address of the MOS
 LDX #0                 \ keyboard translation table into (Y X)
 LDY #255
 JSR OSBYTE

 STX TRTB%              \ Store the address of the keyboard translation table in
 STY TRTB%+1            \ TRTB%(1 0)

 JMP PROT1              \ Call PROT1 to calculate checksums into CHKSM,
                        \ returning from the subroutine using a tail call

ENDIF