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Diffstat (limited to 'src/mame/drivers/halleys.cpp')
-rw-r--r--src/mame/drivers/halleys.cpp3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/mame/drivers/halleys.cpp b/src/mame/drivers/halleys.cpp
index 437b0fbfbbe..9619ae37f2d 100644
--- a/src/mame/drivers/halleys.cpp
+++ b/src/mame/drivers/halleys.cpp
@@ -1637,6 +1637,8 @@ static ADDRESS_MAP_START( halleys_map, AS_PROGRAM, 8, halleys_state )
AM_RANGE(0x1000, 0xefff) AM_ROM
AM_RANGE(0xf000, 0xfeff) AM_RAM // work ram
+ AM_RANGE(0xff00, 0xffbf) AM_RAM AM_SHARE("io_ram") // I/O write fall-through
+
AM_RANGE(0xff66, 0xff66) AM_READ(collision_id_r) // HACK: collision detection bypass(Halley's Comet only)
AM_RANGE(0xff71, 0xff71) AM_READ(blitter_status_r)
AM_RANGE(0xff80, 0xff83) AM_READ(io_mirror_r)
@@ -1650,7 +1652,6 @@ static ADDRESS_MAP_START( halleys_map, AS_PROGRAM, 8, halleys_state )
AM_RANGE(0xff96, 0xff96) AM_READ_PORT("DSW2") // dipswitch 3
AM_RANGE(0xff97, 0xff97) AM_READ_PORT("DSW3") // dipswitch 2
AM_RANGE(0xff9c, 0xff9c) AM_WRITE(firq_ack_w)
- AM_RANGE(0xff00, 0xffbf) AM_RAM AM_SHARE("io_ram") // I/O write fall-through
AM_RANGE(0xffc0, 0xffdf) AM_READWRITE(paletteram_r, paletteram_w)
AM_RANGE(0xffe0, 0xffff) AM_READ(vector_r)