// license:BSD-3-Clause // copyright-holders:Sandro Ronco /*************************************************************************** ram.c KC 85 RAM modules emulation Supported modules: - M011 64KB RAM - M022 16KB RAM - M032 256KB segmented RAM - M034 512KB segmented RAM - M035 1MB segmented RAM - M036 128KB segmented RAM ***************************************************************************/ #include "emu.h" #include "ram.h" /*************************************************************************** IMPLEMENTATION ***************************************************************************/ //************************************************************************** // GLOBAL VARIABLES //************************************************************************** const device_type KC_M011 = &device_creator; const device_type KC_M022 = &device_creator; const device_type KC_M032 = &device_creator; const device_type KC_M034 = &device_creator; const device_type KC_M035 = &device_creator; const device_type KC_M036 = &device_creator; //************************************************************************** // M011 64KB RAM //************************************************************************** //------------------------------------------------- // kc_m011_device - constructor //------------------------------------------------- kc_m011_device::kc_m011_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : device_t(mconfig, KC_M011, "M011 64KB RAM", tag, owner, clock, "kc_m011", __FILE__), device_kcexp_interface( mconfig, *this ) { } kc_m011_device::kc_m011_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_kcexp_interface( mconfig, *this ) { } //------------------------------------------------- // device_start - device-specific startup //------------------------------------------------- void kc_m011_device::device_start() { m_slot = dynamic_cast(owner()); m_ram = machine().memory().region_alloc(tag(), get_ram_size(), 1, ENDIANNESS_LITTLE)->base(); memset(m_ram, 0, get_ram_size()); } //------------------------------------------------- // device_reset - device-specific reset //------------------------------------------------- void kc_m011_device::device_reset() { m_enabled = 0; m_write_enabled = 0; m_base = 0; m_segment = 0; m_mei = 0; } /*------------------------------------------------- module control write -------------------------------------------------*/ void kc_m011_device::control_w(UINT8 data) { if (m_mei) { m_enabled = BIT(data, 0); m_write_enabled = BIT(data, 1); m_base = (data & 0xc0) << 8; } } /*------------------------------------------------- read -------------------------------------------------*/ void kc_m011_device::read(offs_t offset, UINT8 &data) { UINT32 addr = offset ^ m_base; if (addr < 0x10000 && m_enabled && m_mei) { data = m_ram[addr]; // clear the MEO line for disable other modules with less priority m_slot->meo_w(CLEAR_LINE); } } /*------------------------------------------------- write -------------------------------------------------*/ void kc_m011_device::write(offs_t offset, UINT8 data) { UINT32 addr = offset ^ m_base; if (addr < 0x10000 && m_enabled && m_mei) { if (m_write_enabled) m_ram[addr] = data; // clear the MEO line for disable other modules with less priority m_slot->meo_w(CLEAR_LINE); } } /*------------------------------------------------- MEI line write -------------------------------------------------*/ WRITE_LINE_MEMBER( kc_m011_device::mei_w ) { m_mei = state; // update MEO line m_slot->meo_w(state); } //************************************************************************** // M022 16KB RAM //************************************************************************** //------------------------------------------------- // kc_m022_device - constructor //------------------------------------------------- kc_m022_device::kc_m022_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : kc_m011_device(mconfig, KC_M022, "M022 16KB RAM", tag, owner, clock, "kc_m022", __FILE__) { } /*------------------------------------------------- read -------------------------------------------------*/ void kc_m022_device::read(offs_t offset, UINT8 &data) { if (offset >= m_base && offset < (m_base + 0x4000) && m_enabled && m_mei) { data = m_ram[offset - m_base]; // clear the MEO line for disable other modules with less priority m_slot->meo_w(CLEAR_LINE); } } /*------------------------------------------------- write -------------------------------------------------*/ void kc_m022_device::write(offs_t offset, UINT8 data) { if (offset >= m_base && offset < (m_base + 0x4000) && m_enabled && m_mei) { if (m_write_enabled) m_ram[offset - m_base] = data; // clear the MEO line for disable other modules with less priority m_slot->meo_w(CLEAR_LINE); } } //************************************************************************** // M032 256KB segmented RAM //************************************************************************** //------------------------------------------------- // kc_m032_device - constructor //------------------------------------------------- kc_m032_device::kc_m032_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : kc_m011_device(mconfig, KC_M032, "M032 256KB segmented RAM", tag, owner, clock, "kc_m032", __FILE__) { } //------------------------------------------------- // device_reset - device-specific reset //------------------------------------------------- void kc_m032_device::device_reset() { kc_m011_device::device_reset(); m_base = 0x4000; } /*------------------------------------------------- module control write -------------------------------------------------*/ void kc_m032_device::control_w(UINT8 data) { if (m_mei) { m_enabled = BIT(data, 0); m_write_enabled = BIT(data, 1); m_segment = (data>>2) & 0x0f; m_base = (data & 0x80) ? 0x8000 : 0x4000; } } /*------------------------------------------------- read -------------------------------------------------*/ void kc_m032_device::read(offs_t offset, UINT8 &data) { if (offset >= m_base && offset < (m_base + 0x4000) && m_enabled && m_mei) { data = m_ram[(offset - m_base) | (m_segment << 14)]; // clear the MEO line for disable other modules with less priority m_slot->meo_w(CLEAR_LINE); } } /*------------------------------------------------- write -------------------------------------------------*/ void kc_m032_device::write(offs_t offset, UINT8 data) { if (offset >= m_base && offset < (m_base + 0x4000) && m_enabled && m_mei) { if (m_write_enabled) m_ram[(offset - m_base) | (m_segment << 14)] = data; // clear the MEO line for disable other modules with less priority m_slot->meo_w(CLEAR_LINE); } } //************************************************************************** // M034 512KB segmented RAM //************************************************************************** //------------------------------------------------- // kc_m034_device - constructor //------------------------------------------------- kc_m034_device::kc_m034_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : kc_m011_device(mconfig, KC_M034, "M034 512KB segmented RAM", tag, owner, clock, "kc_m034", __FILE__) { } //------------------------------------------------- // device_reset - device-specific reset //------------------------------------------------- void kc_m034_device::device_reset() { kc_m011_device::device_reset(); m_base = 0x4000; } /*------------------------------------------------- module control write -------------------------------------------------*/ void kc_m034_device::control_w(UINT8 data) { if (m_mei) { m_enabled = BIT(data, 0); m_write_enabled = BIT(data, 1); m_segment = (data>>2) & 0x1f; m_base = (data & 0x80) ? 0x8000 : 0x4000; } } /*------------------------------------------------- read -------------------------------------------------*/ void kc_m034_device::read(offs_t offset, UINT8 &data) { if (offset >= m_base && offset < (m_base + 0x4000) && m_enabled && m_mei) { data = m_ram[(offset - m_base) | (m_segment << 14)]; // clear the MEO line for disable other modules with less priority m_slot->meo_w(CLEAR_LINE); } } /*------------------------------------------------- write -------------------------------------------------*/ void kc_m034_device::write(offs_t offset, UINT8 data) { if (offset >= m_base && offset < (m_base + 0x4000) && m_enabled && m_mei) { if (m_write_enabled) m_ram[(offset - m_base) | (m_segment << 14)] = data; // clear the MEO line for disable other modules with less priority m_slot->meo_w(CLEAR_LINE); } } //************************************************************************** // M035 1MB segmented RAM //************************************************************************** //------------------------------------------------- // kc_m035_device - constructor //------------------------------------------------- kc_m035_device::kc_m035_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : kc_m011_device(mconfig, KC_M035, "M035 1MB segmented RAM", tag, owner, clock, "kc_m035", __FILE__) { } /*------------------------------------------------- module control write -------------------------------------------------*/ void kc_m035_device::control_w(UINT8 data) { if (m_mei) { m_enabled = BIT(data, 0); m_write_enabled = BIT(data, 1); m_segment = (data>>2) & 0x3f; } } /*------------------------------------------------- read -------------------------------------------------*/ void kc_m035_device::read(offs_t offset, UINT8 &data) { if (offset >= 0x8000 && offset < 0xc000 && m_enabled & m_mei) { data = m_ram[(offset - 0x8000) | (m_segment << 14)]; // clear the MEO line for disable other modules with less priority m_slot->meo_w(CLEAR_LINE); } } /*------------------------------------------------- write -------------------------------------------------*/ void kc_m035_device::write(offs_t offset, UINT8 data) { if (offset >= 0x8000 && offset < 0xc000 && m_enabled && m_mei) { if (m_write_enabled) m_ram[(offset-0x8000) | (m_segment << 14)] = data; // clear the MEO line for disable other modules with less priority m_slot->meo_w(CLEAR_LINE); } } //************************************************************************** // M036 128KB segmented RAM //************************************************************************** //------------------------------------------------- // kc_m036_device - constructor //------------------------------------------------- kc_m036_device::kc_m036_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : kc_m011_device(mconfig, KC_M036, "M036 128KB segmented RAM", tag, owner, clock, "kc_m036", __FILE__) { } //------------------------------------------------- // device_reset - device-specific reset //------------------------------------------------- void kc_m036_device::device_reset() { kc_m011_device::device_reset(); m_base = 0x4000; } /*------------------------------------------------- module control write -------------------------------------------------*/ void kc_m036_device::control_w(UINT8 data) { if (m_mei) { m_enabled = BIT(data, 0); m_write_enabled = BIT(data, 1); m_segment = (data>>2) & 0x07; m_base = (data & 0x80) ? 0x8000 : 0x4000; } } /*------------------------------------------------- read -------------------------------------------------*/ void kc_m036_device::read(offs_t offset, UINT8 &data) { if (offset >= m_base && offset < (m_base + 0x4000) && m_enabled && m_mei) { data = m_ram[(offset - m_base) | (m_segment << 14)]; // clear the MEO line for disable other modules with less priority m_slot->meo_w(CLEAR_LINE); } } /*------------------------------------------------- write -------------------------------------------------*/ void kc_m036_device::write(offs_t offset, UINT8 data) { if (offset >= m_base && offset < (m_base + 0x4000) && m_enabled && m_mei) { if (m_write_enabled) m_ram[(offset - m_base) | (m_segment << 14)] = data; // clear the MEO line for disable other modules with less priority m_slot->meo_w(CLEAR_LINE); } }