Anybody feel like trying this code modification?
It reverses the state of the feature lamps near the left saucer under the plastics that look like non-functioning G.I lamps.
Normally those lamps are off which leaves that area of the playfield being dark. They flash on when the ball enters the tube.
The modification results in those lamps being normally on so the area is lit, and flash off when the ball enters the tube.
Using a hex editor, perform the following changes and program new EPROMs:
offset: old values ---> new values
U1:
$06D5: $8A, $30 ---> $84, $CF
$07FC: $A6 ---> $0D
U2:
$0412 $CA, $30 ---> $C4, $CF
$0687 $FF ---> $CF
$070F $5C, $23 ---> $5F, $DC
$07FD $96 ---> $71
U6:
$0FDC $FF, $FF, $FF ---> $BD, $5C, $23
$0FDF $FF, $FF ---> $C6, $CF
$0FE1 $FF, $FF, $FF ---> $F7, $02, $14
$0FE4 $FF ---> $39
$0FF7 $DB ---> $BB
If your game has U1 and U2 merged into a larger ROM at U2 (i.e. there's no U1), modifications for the larger U2 are as follows:
U2:
$06D5: $8A, $30 ---> $84, $CF
$07FC: $A6 ---> $0D
$0C12 $CA, $30 ---> $C4, $CF
$0E87 $FF ---> $CF
$0F0F $5C, $23 ---> $5F, $DC
$0FFD $96 ---> $71