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apple2: add DIP switch to "The Mill" 6809 card to select between original and OS-9 memory mappings. [R. Belmont]

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This commit is contained in:
arbee 2020-08-01 21:45:38 -04:00
parent 5c210560e8
commit 4db4f2026b
2 changed files with 22 additions and 3 deletions
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22
src/devices/bus/a2bus/a2themill.cpp
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@ -18,8 +18,6 @@
ProDOS "Stellation The Mill Disk.po" requires Mill in slot 2; boot
the disc and type "-DEMO1" and press Enter to launch the simple demo.
TODO: Add DIP switch to select standard and OS-9 modes.
*********************************************************************/
#include "emu.h"
@ -43,6 +41,23 @@ void a2bus_themill_device::m6809_mem(address_map &map)
map(0x0000, 0xffff).rw(FUNC(a2bus_themill_device::dma_r), FUNC(a2bus_themill_device::dma_w));
}
static INPUT_PORTS_START( themill )
PORT_START("MILLCFG")
PORT_DIPNAME( 0x01, 0x01, "6809 Mapping" )
PORT_DIPSETTING( 0x00, "Original")
PORT_DIPSETTING( 0x01, "OS-9")
INPUT_PORTS_END
//-------------------------------------------------
// input_ports - device-specific input ports
//-------------------------------------------------
ioport_constructor a2bus_themill_device::device_input_ports() const
{
return INPUT_PORTS_NAME( themill );
}
/***************************************************************************
FUNCTION PROTOTYPES
***************************************************************************/
@ -65,6 +80,7 @@ a2bus_themill_device::a2bus_themill_device(const machine_config &mconfig, device
: device_t(mconfig, type, tag, owner, clock)
, device_a2bus_card_interface(mconfig, *this)
, m_6809(*this, "m6809")
, m_cfgsw(*this, "MILLCFG")
, m_bEnabled(false)
, m_flipAddrSpace(false)
, m_6809Mode(false)
@ -93,7 +109,7 @@ void a2bus_themill_device::device_reset()
{
m_bEnabled = false;
m_flipAddrSpace = false;
m_6809Mode = true;
m_6809Mode = (m_cfgsw->read() & 1) ? true : false;
m_status = 0xc0; // OS9 loader relies on this
m_6809->set_input_line(INPUT_LINE_HALT, ASSERT_LINE);
m_6809->set_input_line(INPUT_LINE_RESET, ASSERT_LINE);

3
src/devices/bus/a2bus/a2themill.h
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@ -33,6 +33,7 @@ protected:
virtual void device_start() override;
virtual void device_reset() override;
virtual void device_add_mconfig(machine_config &config) override;
virtual ioport_constructor device_input_ports() const override;
// overrides of standard a2bus slot functions
virtual uint8_t read_c0nx(uint8_t offset) override;
@ -41,6 +42,8 @@ protected:
private:
required_device<cpu_device> m_6809;
required_ioport m_cfgsw;
bool m_bEnabled;
bool m_flipAddrSpace;
bool m_6809Mode;