Sandbox collapse test

$FFFF8A38.W|RW|BLT_LPB|Lines per BOB                         (0:65536)|BLT
$FFFF8A3A.B|RW|BLT_HTO|Halftone Operation                   %______xx |BLT

[$FFFF8A3A bit detail]

$FFFF8A3B.B|RW|BLT_LGO|Logical Operation                    %____xxxx |BLT
$FFFF8A3C.B|RW|BLT_LNM|Line Number                          %BHS_xxxx |BLT

$FFFF8A3A  BLT_HOP  Halftone Operation      bits 1-0 used
  0   all ones ($FFFF)
  1   halftone RAM word
  2   source word
  3   source word AND halftone RAM word