Version analysis of BELL - 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: BELL
       Type: Subroutine
   Category: Sound
    Summary: Make a standard system beep


 This is the standard system beep, as made by the ASCII 7 "BELL" control code.


.BELL

 LDA #7                 \ Control code 7 makes a beep, so load this into A

Code variation 1 of 1Related to the 6502SP version

If speech is enabled in the Executive version, only the BELL routine makes a standard system beep (the CHPR routine no longer does).

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

Cassette, Flight, Docked, Electron
Master
6502SP
                        \ Fall through into the TT26 print routine to
                        \ actually make the sound
 JMP CHPR               \ Call the CHPR print routine to actually make the sound
                        \ Fall through into the CHPR print routine to
                        \ actually make the sound

IF _EXECUTIVE

 BNE CHPRD              \ Jump down to CHPRD to actually make the sound,
                        \ skipping the code that prevents CHPR from beeping if
                        \ speech is enabled, so the beep gets made even if
                        \ speech is enabled (this BNE is effectively a JMP as
                        \ A is never 0)

ENDIF