Version analysis of ou2 - 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), 6502 Second Processor, Master and Electron

Code variations between these versions are shown below.

       Name: ou2
       Type: Subroutine
   Category: Flight
    Summary: Display "E.C.M.SYSTEM DESTROYED" as an in-flight message


.ou2

 LDA #108               \ Set A to recursive token 108 ("E.C.M.SYSTEM")

Code variation 1 of 1Specific to an individual platform

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

Cassette, Flight, Electron
6502SP, Master
 EQUB &2C               \ Fall through into ou3 to print the new message, but
                        \ skip the first instruction by turning it into
                        \ &2C &A9 &6F, or BIT &6FA9, which does nothing apart
                        \ from affect the flags
 JMP MESS               \ Print recursive token A as an in-flight message,
                        \ followed by " DESTROYED", and return from the
                        \ subroutine using a tail call