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isbc: more ram, maybe (nw)

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This commit is contained in:
cracyc 2017-03-19 09:06:17 -05:00
parent c91a6b84f4
commit 69f45a5f59
1 changed files with 34 additions and 2 deletions
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36
src/mame/drivers/isbc.cpp
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@ -43,7 +43,9 @@ public:
m_pic_0(*this, "pic_0"), m_pic_0(*this, "pic_0"),
m_pic_1(*this, "pic_1"), m_pic_1(*this, "pic_1"),
m_centronics(*this, "centronics"), m_centronics(*this, "centronics"),
m_cent_status_in(*this, "cent_status_in") m_cent_status_in(*this, "cent_status_in"),
m_bios(*this, "user1"),
m_biosram(*this, "biosram")
{ {
} }
@ -55,6 +57,8 @@ public:
optional_device<pic8259_device> m_pic_1; optional_device<pic8259_device> m_pic_1;
optional_device<centronics_device> m_centronics; optional_device<centronics_device> m_centronics;
optional_device<input_buffer_device> m_cent_status_in; optional_device<input_buffer_device> m_cent_status_in;
optional_memory_region m_bios;
optional_shared_ptr<u16> m_biosram;
DECLARE_WRITE_LINE_MEMBER(write_centronics_ack); DECLARE_WRITE_LINE_MEMBER(write_centronics_ack);
@ -63,8 +67,13 @@ public:
// DECLARE_WRITE_LINE_MEMBER(isbc_uart8274_irq); // DECLARE_WRITE_LINE_MEMBER(isbc_uart8274_irq);
DECLARE_READ8_MEMBER(get_slave_ack); DECLARE_READ8_MEMBER(get_slave_ack);
DECLARE_WRITE8_MEMBER(ppi_c_w); DECLARE_WRITE8_MEMBER(ppi_c_w);
DECLARE_WRITE8_MEMBER(upperen_w);
DECLARE_READ16_MEMBER(bioslo_r);
DECLARE_WRITE16_MEMBER(bioslo_w);
protected: protected:
void machine_reset() override; void machine_reset() override;
private:
bool m_upperen;
}; };
void isbc_state::machine_reset() void isbc_state::machine_reset()
@ -76,6 +85,7 @@ void isbc_state::machine_reset()
} }
if(m_uart8251) if(m_uart8251)
m_uart8251->write_cts(0); m_uart8251->write_cts(0);
m_upperen = false;
} }
static ADDRESS_MAP_START(rpc86_mem, AS_PROGRAM, 16, isbc_state) static ADDRESS_MAP_START(rpc86_mem, AS_PROGRAM, 16, isbc_state)
@ -141,6 +151,7 @@ static ADDRESS_MAP_START(isbc286_io, AS_IO, 16, isbc_state)
AM_RANGE(0x00c0, 0x00c3) AM_DEVREADWRITE8("pic_0", pic8259_device, read, write, 0x00ff) AM_RANGE(0x00c0, 0x00c3) AM_DEVREADWRITE8("pic_0", pic8259_device, read, write, 0x00ff)
AM_RANGE(0x00c4, 0x00c7) AM_DEVREADWRITE8("pic_1", pic8259_device, read, write, 0x00ff) AM_RANGE(0x00c4, 0x00c7) AM_DEVREADWRITE8("pic_1", pic8259_device, read, write, 0x00ff)
AM_RANGE(0x00c8, 0x00cf) AM_DEVREADWRITE8("ppi", i8255_device, read, write, 0x00ff) AM_RANGE(0x00c8, 0x00cf) AM_DEVREADWRITE8("ppi", i8255_device, read, write, 0x00ff)
AM_RANGE(0x00c8, 0x00cf) AM_WRITE8(upperen_w, 0xff00)
AM_RANGE(0x00d0, 0x00d7) AM_DEVREADWRITE8("pit", pit8254_device, read, write, 0x00ff) AM_RANGE(0x00d0, 0x00d7) AM_DEVREADWRITE8("pit", pit8254_device, read, write, 0x00ff)
AM_RANGE(0x00d8, 0x00df) AM_DEVREADWRITE8("uart8274", i8274N_device, cd_ba_r, cd_ba_w, 0x00ff) AM_RANGE(0x00d8, 0x00df) AM_DEVREADWRITE8("uart8274", i8274N_device, cd_ba_r, cd_ba_w, 0x00ff)
AM_RANGE(0x0100, 0x0101) AM_DEVWRITE8("isbc_215g", isbc_215g_device, write, 0x00ff) AM_RANGE(0x0100, 0x0101) AM_DEVWRITE8("isbc_215g", isbc_215g_device, write, 0x00ff)
@ -156,7 +167,8 @@ ADDRESS_MAP_END
static ADDRESS_MAP_START(isbc2861_mem, AS_PROGRAM, 16, isbc_state) static ADDRESS_MAP_START(isbc2861_mem, AS_PROGRAM, 16, isbc_state)
ADDRESS_MAP_UNMAP_HIGH ADDRESS_MAP_UNMAP_HIGH
AM_RANGE(0x00000, 0xdffff) AM_RAM AM_RANGE(0x00000, 0xdffff) AM_RAM
AM_RANGE(0xf0000, 0xfffff) AM_ROM AM_REGION("user1",0) AM_RANGE(0xe0000, 0xfffff) AM_READWRITE(bioslo_r, bioslo_w) AM_SHARE("biosram")
// AM_RANGE(0x100000, 0x1fffff) AM_RAM // FIXME: XENIX doesn't like this, IRMX is okay with it
AM_RANGE(0xff0000, 0xffffff) AM_ROM AM_REGION("user1",0) AM_RANGE(0xff0000, 0xffffff) AM_ROM AM_REGION("user1",0)
ADDRESS_MAP_END ADDRESS_MAP_END
@ -218,6 +230,26 @@ WRITE8_MEMBER( isbc_state::ppi_c_w )
m_pic_1->ir7_w(0); m_pic_1->ir7_w(0);
} }
WRITE8_MEMBER(isbc_state::upperen_w)
{
m_upperen = true;
}
READ16_MEMBER(isbc_state::bioslo_r)
{
if(m_upperen)
return m_biosram[offset];
else if(offset >= 0x8000)
return m_bios->as_u16(offset - 0x8000);
return 0xffff;
}
WRITE16_MEMBER(isbc_state::bioslo_w)
{
if(m_upperen)
COMBINE_DATA(&m_biosram[offset]);
}
#if 0 #if 0
WRITE_LINE_MEMBER(isbc_state::isbc_uart8274_irq) WRITE_LINE_MEMBER(isbc_state::isbc_uart8274_irq)
{ {