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-rw-r--r--src/devices/bus/kc/rom.c230
1 files changed, 230 insertions, 0 deletions
diff --git a/src/devices/bus/kc/rom.c b/src/devices/bus/kc/rom.c
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index 00000000000..3a80207dd7b
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+++ b/src/devices/bus/kc/rom.c
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+// license:BSD-3-Clause
+// copyright-holders:Sandro Ronco
+/***************************************************************************
+
+ rom.c
+
+ KC 85 ROM modules emulation
+
+ Supported modules:
+ - Generic 8KB ROM module
+ - M006 BASIC
+ - M033 TypeStar
+
+***************************************************************************/
+
+#include "emu.h"
+#include "rom.h"
+
+#define REGION_TAG "rom"
+
+/***************************************************************************
+ IMPLEMENTATION
+***************************************************************************/
+
+ROM_START( kc_rom )
+ ROM_REGION(0x4000, REGION_TAG, ROMREGION_ERASEFF)
+ROM_END
+
+//**************************************************************************
+// GLOBAL VARIABLES
+//**************************************************************************
+
+const device_type KC_STANDARD = &device_creator<kc_8k_device>;
+const device_type KC_M006 = &device_creator<kc_m006_device>;
+const device_type KC_M033 = &device_creator<kc_m033_device>;
+
+//**************************************************************************
+// LIVE DEVICE
+//**************************************************************************
+
+//-------------------------------------------------
+// kc_8k_device - constructor
+//-------------------------------------------------
+
+kc_8k_device::kc_8k_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
+ : device_t(mconfig, KC_STANDARD, "Standard", tag, owner, clock, "kc_8k", __FILE__),
+ device_kcexp_interface( mconfig, *this )
+{
+}
+
+kc_8k_device::kc_8k_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_8k_device::device_start()
+{
+ m_slot = dynamic_cast<kcexp_slot_device *>(owner());
+ m_rom = memregion(REGION_TAG)->base();
+}
+
+//-------------------------------------------------
+// device_reset - device-specific reset
+//-------------------------------------------------
+
+void kc_8k_device::device_reset()
+{
+ m_enabled = 0;
+ m_base = 0;
+ m_mei = 0;
+}
+
+//-------------------------------------------------
+// rom_region - device-specific ROM region
+//-------------------------------------------------
+
+const rom_entry *kc_8k_device::device_rom_region() const
+{
+ return ROM_NAME( kc_rom );
+}
+
+/*-------------------------------------------------
+ get_cart_base
+-------------------------------------------------*/
+
+UINT8* kc_8k_device::get_cart_base()
+{
+ return m_rom;
+}
+
+/*-------------------------------------------------
+ module control write
+-------------------------------------------------*/
+
+void kc_8k_device::control_w(UINT8 data)
+{
+ if (m_mei)
+ {
+ m_enabled = BIT(data, 0);
+ m_base = (data & 0xe0) << 8;
+ }
+}
+
+/*-------------------------------------------------
+ read
+-------------------------------------------------*/
+
+void kc_8k_device::read(offs_t offset, UINT8 &data)
+{
+ if (offset >= m_base && offset < (m_base + 0x2000) && m_enabled && m_mei)
+ {
+ data = m_rom[offset - m_base];
+
+ // clear the MEO line for disable other modules with less priority
+ m_slot->meo_w(CLEAR_LINE);
+ }
+}
+
+/*-------------------------------------------------
+ MEI line write
+-------------------------------------------------*/
+
+WRITE_LINE_MEMBER( kc_8k_device::mei_w )
+{
+ m_mei = state;
+
+ // update MEO line
+ m_slot->meo_w(state);
+}
+
+//**************************************************************************
+// M006 BASIC
+//**************************************************************************
+
+//-------------------------------------------------
+// kc_m006_device - constructor
+//-------------------------------------------------
+
+kc_m006_device::kc_m006_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
+ : kc_8k_device(mconfig, KC_M006, "M006 BASIC", tag, owner, clock, "kc_m006", __FILE__)
+{
+}
+
+/*-------------------------------------------------
+ module control write
+-------------------------------------------------*/
+
+void kc_m006_device::control_w(UINT8 data)
+{
+ if (m_mei)
+ {
+ m_enabled = BIT(data, 0);
+ m_base = (data & 0xc0) << 8;
+ }
+}
+
+/*-------------------------------------------------
+ read
+-------------------------------------------------*/
+
+void kc_m006_device::read(offs_t offset, UINT8 &data)
+{
+ if (offset >= m_base && offset < (m_base + 0x4000) && m_enabled)
+ {
+ data = m_rom[offset - m_base];
+
+ // clear the MEO line for disable other modules with less priority
+ m_slot->meo_w(CLEAR_LINE);
+ }
+}
+
+
+//**************************************************************************
+// M033 TypeStar module
+//**************************************************************************
+
+//-------------------------------------------------
+// kc_m033_device - constructor
+//-------------------------------------------------
+
+kc_m033_device::kc_m033_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
+ : kc_8k_device(mconfig, KC_M033, "M033 TypeStar", tag, owner, clock, "kc_m033", __FILE__)
+{
+}
+
+//-------------------------------------------------
+// device_reset - device-specific reset
+//-------------------------------------------------
+
+void kc_m033_device::device_reset()
+{
+ kc_8k_device::device_reset();
+
+ m_bank = 0;
+}
+
+/*-------------------------------------------------
+ module control write
+-------------------------------------------------*/
+
+void kc_m033_device::control_w(UINT8 data)
+{
+ if (m_mei)
+ {
+ m_enabled = BIT(data, 0);
+ m_base = (data & 0xc0) << 8;
+ m_bank = BIT(data, 4);
+ }
+}
+
+/*-------------------------------------------------
+ read
+-------------------------------------------------*/
+
+void kc_m033_device::read(offs_t offset, UINT8 &data)
+{
+ if (offset >= m_base && offset < (m_base + 0x2000) && m_enabled && m_mei)
+ {
+ data = m_rom[(offset - m_base) | (m_bank<<13)];
+
+ // clear the MEO line for disable other modules with less priority
+ m_slot->meo_w(CLEAR_LINE);
+ }
+}