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bbc_ramdisc: Added configuration option to select 1MB or 2MB model (nw)

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This commit is contained in:
Nigel Barnes 2019-11-22 23:17:15 +00:00
parent 50d394f973
commit bd16004351
2 changed files with 12 additions and 8 deletions
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17
src/devices/bus/bbc/1mhzbus/ramdisc.cpp
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@ -31,6 +31,10 @@ static INPUT_PORTS_START(ramdisc)
PORT_CONFNAME(0x01, 0x01, "Power") PORT_CHANGED_MEMBER(DEVICE_SELF, bbc_ramdisc_device, power_changed, 0)
PORT_CONFSETTING(0x00, DEF_STR(Off))
PORT_CONFSETTING(0x01, DEF_STR(On))
PORT_START("SIZE")
PORT_CONFNAME(0x03, 0x02, "RAM Disk Capacity")
PORT_CONFSETTING(0x01, "1MB")
PORT_CONFSETTING(0x02, "2MB")
INPUT_PORTS_END
//-------------------------------------------------
@ -87,6 +91,7 @@ bbc_ramdisc_device::bbc_ramdisc_device(const machine_config &mconfig, const char
, device_bbc_1mhzbus_interface(mconfig, *this)
, m_1mhzbus(*this, "1mhzbus")
, m_nvram(*this, "nvram")
, m_ram_size(*this, "SIZE")
, m_power(*this, "POWER")
, m_sector(0)
{
@ -99,11 +104,11 @@ bbc_ramdisc_device::bbc_ramdisc_device(const machine_config &mconfig, const char
void bbc_ramdisc_device::device_start()
{
/* define 2mb ram */
m_ram = std::make_unique<uint8_t[]>(RAM_SIZE);
m_nvram->set_base(m_ram.get(), RAM_SIZE);
m_ram = std::make_unique<uint8_t[]>(0x200000);
m_nvram->set_base(m_ram.get(), 0x200000);
/* register for save states */
save_pointer(NAME(m_ram), RAM_SIZE);
save_pointer(NAME(m_ram), 0x200000);
save_item(NAME(m_sector));
}
@ -117,7 +122,7 @@ INPUT_CHANGED_MEMBER(bbc_ramdisc_device::power_changed)
/* clear RAM on power off */
if (!newval)
{
memset(m_ram.get(), 0xff, RAM_SIZE);
memset(m_ram.get(), 0xff, 0x200000);
}
}
@ -181,7 +186,7 @@ uint8_t bbc_ramdisc_device::jim_r(offs_t offset)
uint8_t data = 0xff;
/* power on and sector < 2mb */
if (m_power->read() && m_sector < RAM_SIZE)
if (m_power->read() && m_sector < (m_ram_size->read() << 8))
{
data &= m_ram[(m_sector << 8) | offset];
}
@ -194,7 +199,7 @@ uint8_t bbc_ramdisc_device::jim_r(offs_t offset)
void bbc_ramdisc_device::jim_w(offs_t offset, uint8_t data)
{
/* power on and sector < 2mb */
if (m_power->read() && m_sector < RAM_SIZE)
if (m_power->read() && m_sector < (m_ram_size->read() << 8))
{
m_ram[(m_sector << 8) | offset] = data;
}

3
src/devices/bus/bbc/1mhzbus/ramdisc.h
View File

@ -42,10 +42,9 @@ protected:
virtual void jim_w(offs_t offset, uint8_t data) override;
private:
static const size_t RAM_SIZE = 0x200000;
required_device<bbc_1mhzbus_slot_device> m_1mhzbus;
required_device<nvram_device> m_nvram;
required_ioport m_ram_size;
required_ioport m_power;
std::unique_ptr<uint8_t[]> m_ram;