build address table at runtime

src/fx/fx.dhgr.fizzle.a

@@ -5,6 +5,16 @@
 !to "build/FX/DHGR.FIZZLE",plain
 *=$6000
 
+addrs=$6100
+
+         ldx   #$1F                  ; build address lookup table
+-        txa
+         eor   #$20
+         sta   addrs, x
+         eor   #$80
+         sta   addrs+$20, x
+         dex
+         bpl   -
          ldx   #(end-start)          ; copy LFSR code to zero page
 -        lda   start-1, x
          sta   $0, x
@@ -51,8 +61,3 @@ exit     lda   $4000                 ; last lousy byte (because LFSR never hits
          rts
 }
 end
-addrs
-         !byte $20,$21,$22,$23,$24,$25,$26,$27,$28,$29,$2A,$2B,$2C,$2D,$2E,$2F
-         !byte $30,$31,$32,$33,$34,$35,$36,$37,$38,$39,$3A,$3B,$3C,$3D,$3E,$3F
-         !byte $A0,$A1,$A2,$A3,$A4,$A5,$A6,$A7,$A8,$A9,$AA,$AB,$AC,$AD,$AE,$AF
-         !byte $B0,$B1,$B2,$B3,$B4,$B5,$B6,$B7,$B8,$B9,$BA,$BB,$BC,$BD,$BE,$BF