Assembler Guru's.

[Ross Myers]

Hi All,

Been flicking through the code of some Holden stuff lately, and came across
the following, can any of you figure what this maybe used for, This code
structure continues for a fair while and occasionally jumps to some other
running code at $5xxx. An example -

180A CLRA
180B BRCLR $57,$40,$02    (1811 )
180F ORAA  #$80
1811 TST   $02C9
1814 BEQ   $02            (1818 )
1816 ORAA  #$40
1818 BRCLR $50,$02,$02    (181E )
181C ORAA  #$20
181E BRCLR $8E,$01,$02    (1824 )
1822 ORAA  #$10
1824 BRCLR $62,$04,$02    (182A )
1828 ORAA  #$08
182A BRCLR $61,$01,$02    (1830 )
182E ORAA  #$04
1830 BRSET $57,$01,$02    (1836 )
1834 ORAA  #$02
1836 BRCLR $62,$01,$02    (183C )
183A ORAA  #$01
183C STAA  $0488
183F CLRA

Any help appreciated as always.

Ross Myers