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|
// 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<kc_m011_device>;
const device_type KC_M022 = &device_creator<kc_m022_device>;
const device_type KC_M032 = &device_creator<kc_m032_device>;
const device_type KC_M034 = &device_creator<kc_m034_device>;
const device_type KC_M035 = &device_creator<kc_m035_device>;
const device_type KC_M036 = &device_creator<kc_m036_device>;
//**************************************************************************
// 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<kcexp_slot_device *>(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);
}
}
|