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⌂ ∞ ▽ Elite on the BBC Micro and NES

Dashboard: update_pod

[Elite-A, Parasite]

       Name: update_pod                                              [Show more]
       Type: Subroutine
   Category: Dashboard
    Summary: Ensure the correct palette is shown for the dashboard/hyperspace
             tunnel, by sending a write_pod command to the I/O processor

    Context: See this subroutine in context in the source code
 References: This subroutine is called as follows:
             * DFAULT calls update_pod
             * EQSHP calls update_pod
             * ESCAPE calls update_pod
             * LL164 calls update_pod
             * n_buyship calls update_pod
             * status_equip calls update_pod




.update_pod

 LDA #&8F               \ Send command &8F to the I/O processor:
 JSR tube_write         \
                        \   write_pod(escp, hfx)
                        \
                        \ which will update the values of ESCP and HFX in the
                        \ I/O processor, so the palette gets set correctly for
                        \ the dashboard (ESCP) and hyperspace tunnel (HFX)

 LDA ESCP               \ Send the first parameter to the I/O processor:
 JSR tube_write         \
                        \   * escp = ESCP

 LDA HFX                \ Send the second parameter to the I/O processor:
 JMP tube_write         \
                        \   * hfx = HFX
                        \
                        \ and return from the subroutine using a tail call