diff options
Diffstat (limited to 'src/devices/bus/bbc/internal/stlswr.cpp')
-rw-r--r-- | src/devices/bus/bbc/internal/stlswr.cpp | 192 |
1 files changed, 192 insertions, 0 deletions
diff --git a/src/devices/bus/bbc/internal/stlswr.cpp b/src/devices/bus/bbc/internal/stlswr.cpp new file mode 100644 index 00000000000..f4992197453 --- /dev/null +++ b/src/devices/bus/bbc/internal/stlswr.cpp @@ -0,0 +1,192 @@ +// license:BSD-3-Clause +// copyright-holders:Nigel Barnes +/********************************************************************** + + Solidisk Sideways RAM + + http://chrisacorns.computinghistory.org.uk/8bit_Upgrades/Solidisk_128KSWE.html + +**********************************************************************/ + + +#include "emu.h" +#include "stlswr.h" + + +//************************************************************************** +// DEVICE DEFINITIONS +//************************************************************************** + +DEFINE_DEVICE_TYPE(BBC_STLSWR16, bbc_stlswr16_device, "bbc_stlswr16", "Solidisk SWR16 - 16K Sideways RAM"); +DEFINE_DEVICE_TYPE(BBC_STLSWR32, bbc_stlswr32_device, "bbc_stlswr32", "Solidisk SWR32 - 32K Sideways RAM"); +DEFINE_DEVICE_TYPE(BBC_STLSWR64, bbc_stlswr64_device, "bbc_stlswr64", "Solidisk SWR64 - 64K Sideways RAM"); +DEFINE_DEVICE_TYPE(BBC_STLSWR128, bbc_stlswr128_device, "bbc_stlswr128", "Solidisk SWR128 - 128K Sideways RAM"); + + +//------------------------------------------------- +// ROM( stlswr ) +//------------------------------------------------- + +ROM_START(stlswr) + ROM_REGION(0x4000, "exp_rom", 0) + ROM_SYSTEM_BIOS(0, "13", "Toolkit 1.3 03/03/86") + ROMX_LOAD("toolkit-1.3-16k-128k-03-03-86.rom", 0x0000, 0x4000, CRC(a1745d10) SHA1(1821e74feca60b95766ead06df20f6db22e2b4bb), ROM_BIOS(0)) +ROM_END + +//------------------------------------------------- +// device_add_mconfig - add device configuration +//------------------------------------------------- + +void bbc_stlswr16_device::device_add_mconfig(machine_config &config) +{ + /* TODO: romslot3 is unavailable when board is fitted */ + //config.device_remove(":romslot3"); + BBC_ROMSLOT16(config, m_rom[15], bbc_rom_devices, "ram").set_fixed_ram(true); +} + +void bbc_stlswr32_device::device_add_mconfig(machine_config &config) +{ + /* TODO: romslot3 is unavailable when board is fitted */ + //config.device_remove(":romslot3"); + BBC_ROMSLOT16(config, m_rom[14], bbc_rom_devices, "ram").set_fixed_ram(true); + BBC_ROMSLOT16(config, m_rom[15], bbc_rom_devices, "ram").set_fixed_ram(true); +} + +void bbc_stlswr64_device::device_add_mconfig(machine_config &config) +{ + /* TODO: romslot3 is unavailable when board is fitted */ + //config.device_remove(":romslot3"); + BBC_ROMSLOT16(config, m_rom[12], bbc_rom_devices, "ram").set_fixed_ram(true); + BBC_ROMSLOT16(config, m_rom[13], bbc_rom_devices, "ram").set_fixed_ram(true); + BBC_ROMSLOT16(config, m_rom[14], bbc_rom_devices, "ram").set_fixed_ram(true); + BBC_ROMSLOT16(config, m_rom[15], bbc_rom_devices, "ram").set_fixed_ram(true); +} + +void bbc_stlswr128_device::device_add_mconfig(machine_config &config) +{ + /* TODO: romslot3 is unavailable when board is fitted */ + //config.device_remove(":romslot3"); + BBC_ROMSLOT16(config, m_rom[8], bbc_rom_devices, "ram").set_fixed_ram(true); + BBC_ROMSLOT16(config, m_rom[9], bbc_rom_devices, "ram").set_fixed_ram(true); + BBC_ROMSLOT16(config, m_rom[10], bbc_rom_devices, "ram").set_fixed_ram(true); + BBC_ROMSLOT16(config, m_rom[11], bbc_rom_devices, "ram").set_fixed_ram(true); + BBC_ROMSLOT16(config, m_rom[12], bbc_rom_devices, "ram").set_fixed_ram(true); + BBC_ROMSLOT16(config, m_rom[13], bbc_rom_devices, "ram").set_fixed_ram(true); + BBC_ROMSLOT16(config, m_rom[14], bbc_rom_devices, "ram").set_fixed_ram(true); + BBC_ROMSLOT16(config, m_rom[15], bbc_rom_devices, "ram").set_fixed_ram(true); +} + +//------------------------------------------------- +// rom_region - device-specific ROM region +//------------------------------------------------- + +const tiny_rom_entry *bbc_stlswr_device::device_rom_region() const +{ + return ROM_NAME(stlswr); +} + + +//************************************************************************** +// LIVE DEVICE +//************************************************************************** + +//------------------------------------------------- +// bbc_stlswr_device - constructor +//------------------------------------------------- + +bbc_stlswr_device::bbc_stlswr_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock) + : device_t(mconfig, type, tag, owner, clock) + , device_bbc_internal_interface(mconfig, *this) + , m_rom(*this, "romslot%u", 0U) +{ +} + +bbc_stlswr16_device::bbc_stlswr16_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) + : bbc_stlswr_device(mconfig, BBC_STLSWR16, tag, owner, clock) +{ +} + +bbc_stlswr32_device::bbc_stlswr32_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) + : bbc_stlswr_device(mconfig, BBC_STLSWR32, tag, owner, clock) +{ +} + +bbc_stlswr64_device::bbc_stlswr64_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) + : bbc_stlswr_device(mconfig, BBC_STLSWR64, tag, owner, clock) +{ +} + +bbc_stlswr128_device::bbc_stlswr128_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) + : bbc_stlswr_device(mconfig, BBC_STLSWR128, tag, owner, clock) +{ +} + + +//------------------------------------------------- +// device_start - device-specific startup +//------------------------------------------------- + +void bbc_stlswr_device::device_start() +{ + /* register for save states */ + save_item(NAME(m_romsel)); + save_item(NAME(m_ramsel)); +} + + +//************************************************************************** +// IMPLEMENTATION +//************************************************************************** + +uint8_t bbc_stlswr_device::paged_r(offs_t offset) +{ + uint8_t data = 0xff; + + switch (m_romsel) + { + case 0: case 1: case 2: case 3: + /* motherboard rom sockets */ + if (m_mb_rom[m_romsel] && m_mb_rom[m_romsel]->present()) + { + data = m_mb_rom[m_romsel]->read(offset); + } + else + { + data = m_region_swr->base()[offset + (m_romsel << 14)]; + } + break; + default: + /* expansion board sockets */ + if (m_rom[m_romsel] && m_rom[m_romsel]->present()) + { + data = m_rom[m_romsel]->read(offset); + } + else + { + data = m_region_swr->base()[offset + (m_romsel << 14)]; + } + break; + } + + return data; +} + +void bbc_stlswr_device::paged_w(offs_t offset, uint8_t data) +{ + switch (m_romsel) + { + case 0: case 1: case 2: case 3: + /* motherboard rom sockets */ + if (m_mb_rom[m_romsel]) + { + m_mb_rom[m_romsel]->write(offset, data); + } + break; + } + + /* expansion board sockets */ + if (m_rom[m_ramsel]) + { + m_rom[m_ramsel]->write(offset, data); + } +} |