Version analysis of Authors' names

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

Cassette and Electron

Code variations between these versions are shown below.

       Name: Authors' names
       Type: Variable
   Category: Copy protection
    Summary: The authors' names and a copyright notice, buried in the code


 This copyright notice is not used anywhere and it is obfuscated by EOR'ing
 each character with 164, but presumably the authors wanted their names buried
 in the code somewhere. Though they do also have recursive token 94, which
 reads "BY D.BRABEN & I.BELL" and can be displayed on the title screen using
 the "X" configuration option, so this isn't the only author name easter egg
 in the game. It contains the following text:

Code variation 1 of 2A variation in the comments only

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

Cassette
Electron
   (C)Bell/Braben1984
   (C)BellBraben'84

Code variation 2 of 2Minor and very low-impact

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

Cassette
Electron
 EQUB '(' EOR 164
 EQUB 'C' EOR 164
 EQUB ')' EOR 164
 EQUB 'B' EOR 164
 EQUB 'e' EOR 164
 EQUB 'l' EOR 164
 EQUB 'l' EOR 164
 EQUB '/' EOR 164
 EQUB 'B' EOR 164
 EQUB 'r' EOR 164
 EQUB 'a' EOR 164
 EQUB 'b' EOR 164
 EQUB 'e' EOR 164
 EQUB 'n' EOR 164
 EQUB '1' EOR 164
 EQUB '9' EOR 164
 EQUB '8' EOR 164
 EQUB '4' EOR 164
 EQUB '(' EOR 164
 EQUB 'C' EOR 164
 EQUB ')' EOR 164
 EQUB 'B' EOR 164
 EQUB 'e' EOR 164
 EQUB 'l' EOR 164
 EQUB 'l' EOR 164

IF _IB_ACORNSOFT

 EQUB '/' EOR 164

ENDIF

 EQUB 'B' EOR 164
 EQUB 'r' EOR 164
 EQUB 'a' EOR 164
 EQUB 'b' EOR 164
 EQUB 'e' EOR 164
 EQUB 'n' EOR 164

IF _IB_SUPERIOR

 EQUB ''' EOR 164

ELIF _IB_ACORNSOFT

 EQUB '1' EOR 164
 EQUB '9' EOR 164

ENDIF

 EQUB '8' EOR 164
 EQUB '4' EOR 164