diff options
Diffstat (limited to 'src/devices/bus/a2bus/a2eramworks3.c')
-rw-r--r-- | src/devices/bus/a2bus/a2eramworks3.c | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/src/devices/bus/a2bus/a2eramworks3.c b/src/devices/bus/a2bus/a2eramworks3.c new file mode 100644 index 00000000000..17b7b2ceb0e --- /dev/null +++ b/src/devices/bus/a2bus/a2eramworks3.c @@ -0,0 +1,99 @@ +// license:BSD-3-Clause +// copyright-holders:R. Belmont +/********************************************************************* + + a2eramworks3.c + + Applied Engineering RamWorks III + + +*********************************************************************/ + +#include "emu.h" +#include "includes/apple2.h" +#include "a2eramworks3.h" + + +/*************************************************************************** + PARAMETERS +***************************************************************************/ + +//************************************************************************** +// GLOBAL VARIABLES +//************************************************************************** + +const device_type A2EAUX_RAMWORKS3 = &device_creator<a2eaux_ramworks3_device>; + +//************************************************************************** +// LIVE DEVICE +//************************************************************************** + +a2eaux_ramworks3_device::a2eaux_ramworks3_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : + device_t(mconfig, A2EAUX_RAMWORKS3, "Applied Engineering RamWorks III", tag, owner, clock, "a2erwks3", __FILE__), + device_a2eauxslot_card_interface(mconfig, *this) +{ +} + +a2eaux_ramworks3_device::a2eaux_ramworks3_device(const machine_config &mconfig, device_type type, const char *name, const char *tag, device_t *owner, UINT32 clock, const char *shortname, const char *source) : + device_t(mconfig, type, name, tag, owner, clock, shortname, source), + device_a2eauxslot_card_interface(mconfig, *this) +{ +} + +//------------------------------------------------- +// device_start - device-specific startup +//------------------------------------------------- + +void a2eaux_ramworks3_device::device_start() +{ + set_a2eauxslot_device(); + save_item(NAME(m_ram)); + save_item(NAME(m_bank)); +} + +void a2eaux_ramworks3_device::device_reset() +{ + m_bank = 0; +} + +UINT8 a2eaux_ramworks3_device::read_auxram(UINT16 offset) +{ + return m_ram[offset+m_bank]; +} + +void a2eaux_ramworks3_device::write_auxram(UINT16 offset, UINT8 data) +{ + m_ram[offset+m_bank] = data; +} + +UINT8 *a2eaux_ramworks3_device::get_vram_ptr() +{ + return &m_ram[0]; +} + +UINT8 *a2eaux_ramworks3_device::get_auxbank_ptr() +{ + return &m_ram[m_bank]; +} + +/* + These cards are split into 64k logical banks. + + On a RW3: + Banks 00-0F is the first MB + Banks 10-17 are the next 512K + Banks 30-37 are the next 512K + Banks 50-57 are the next 512K + Banks 70-77 are the next 512K + + However, the software will recognize and correctly use a configuration in which + all of banks 00-7F are populated for a total of 8 megabytes. So that's what we do. +*/ +void a2eaux_ramworks3_device::write_c07x(address_space &space, UINT8 offset, UINT8 data) +{ + // write to C073? + if (offset == 3) + { + m_bank = 0x10000 * (data & 0x7f); + } +} |