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⌂ ∞ Elite on the BBC Micro and NES

Tube: read_0346

[Elite-A, Parasite]

       Name: read_0346                                               [Show more]
       Type: Subroutine
   Category: Tube
    Summary: Get the value of LASCT by sending a read_0346 command to the I/O
             processor

    Context: See this subroutine in context in the source code
 References: This subroutine is called as follows:
             * DEATH calls read_0346
             * Main flight loop (Part 3 of 16) calls read_0346
             * Main flight loop (Part 16 of 16) calls read_0346




.read_0346

 LDA #&98               \ Send command &98 to the I/O processor:
 JSR tube_write         \
                        \   =read_0346()
                        \
                        \ which will ask the I/O processor to send the value of
                        \ its copy of LASCT

 JSR tube_read          \ Set A to the response from the I/O processor, which
                        \ will be the value of LASCT that's stored in the I/O
                        \ processor

 STA LASCT              \ Update LASCT to the value received from the I/O
                        \ processor

 RTS                    \ Return from the subroutine