Version analysis of ECMOF - Elite on the BBC Micro and NES

This code appears in the following versions (click to see it in the source code):

Cassette, Disc (flight), Disc (docked), 6502 Second Processor, Master and Electron

Code variations between these versions are shown below.

       Name: ECMOF
       Type: Subroutine
   Category: Sound
    Summary: Switch off the E.C.M.


 Switch the E.C.M. off, turn off the dashboard bulb and make the sound of the
 E.C.M. switching off).

Code variation 1 of 4A variation in the comments only

This variation is blank in the Cassette, Disc (flight), Disc (docked), 6502 Second Processor and Master versions.

Electron
 Other entry points:

   ECMOF-1              Contains an RTS


.ECMOF

Code variation 2 of 4Specific to an individual platform

Tap on a block to expand it, and tap it again to revert.

Cassette, Flight, Docked, 6502SP, Electron
Master
 LDA #0                 \ Set ECMA and ECMP to 0 to indicate that no E.C.M. is
 STA ECMA               \ currently running
 STA ECMP
IF _SNG47

 LDA #0                 \ Set ECMA and ECMP to 0 to indicate that no E.C.M. is
 STA ECMA               \ currently running
 STA ECMP

ELIF _COMPACT

 STZ ECMA               \ Set ECMA and ECMP to 0 to indicate that no E.C.M. is
 STZ ECMP               \ currently running

ENDIF

Code variation 3 of 4Specific to an individual platform

This variation is blank in the Disc (docked) version.

Tap on a block to expand it, and tap it again to revert.

Cassette, Flight, 6502SP, Electron
Master
 JSR ECBLB              \ Update the E.C.M. indicator bulb on the dashboard
 JMP ECBLB              \ Update the E.C.M. indicator bulb on the dashboard and
                        \ return from the subroutine using a tail call

Code variation 4 of 4Specific to an individual platform

This variation is blank in the Master version.

Cassette, Flight, Docked, 6502SP, Electron
 LDA #72                \ Call the NOISE routine with A = 72 to make the sound
 BNE NOISE              \ of the E.C.M. being turned off and return from the
                        \ subroutine using a tail call (this BNE is effectively
                        \ a JMP as A will never be zero)