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Diffstat (limited to 'src/mess/drivers/pc9801.c')
-rw-r--r--src/mess/drivers/pc9801.c9
1 files changed, 6 insertions, 3 deletions
diff --git a/src/mess/drivers/pc9801.c b/src/mess/drivers/pc9801.c
index 3576ce68bd0..17bce6e5b1a 100644
--- a/src/mess/drivers/pc9801.c
+++ b/src/mess/drivers/pc9801.c
@@ -3349,9 +3349,12 @@ MACHINE_START_MEMBER(pc9801_state,pc9801rs)
{
address_space& space = m_maincpu->space(AS_PROGRAM);
membank("wram")->set_base(m_ram->pointer());
- space.install_read_bank(0x100000, 0x100000 + m_ram_size - 1, "ext_wram");
- space.install_write_bank(0x100000, 0x100000 + m_ram_size - 1, "ext_wram");
- membank("ext_wram")->set_base(m_ram->pointer() + 0xa0000);
+ if(m_ram_size)
+ {
+ space.install_read_bank(0x100000, 0x100000 + m_ram_size - 1, "ext_wram");
+ space.install_write_bank(0x100000, 0x100000 + m_ram_size - 1, "ext_wram");
+ membank("ext_wram")->set_base(m_ram->pointer() + 0xa0000);
+ }
}
m_ide_rom = memregion("ide")->base();