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Diffstat (limited to 'src/devices/bus/electron/cart/romp144.cpp')
-rw-r--r--src/devices/bus/electron/cart/romp144.cpp162
1 files changed, 162 insertions, 0 deletions
diff --git a/src/devices/bus/electron/cart/romp144.cpp b/src/devices/bus/electron/cart/romp144.cpp
new file mode 100644
index 00000000000..6e4eb96bd84
--- /dev/null
+++ b/src/devices/bus/electron/cart/romp144.cpp
@@ -0,0 +1,162 @@
+// license:BSD-3-Clause
+// copyright-holders:Nigel Barnes
+/**********************************************************************
+
+ JAFA Systems ROMPlus-144
+
+**********************************************************************/
+
+
+#include "emu.h"
+#include "romp144.h"
+
+
+//**************************************************************************
+// DEVICE DEFINITIONS
+//**************************************************************************
+
+DEFINE_DEVICE_TYPE(ELECTRON_ROMP144, electron_romp144_device, "electron_romp144", "JAFA Systems ROMPlus-144")
+
+
+//-------------------------------------------------
+// device_add_mconfig - add device configuration
+//-------------------------------------------------
+
+void electron_romp144_device::device_add_mconfig(machine_config &config)
+{
+ /* rom sockets */
+ GENERIC_SOCKET(config, m_romslot[0], generic_plain_slot, "electron_rom", "bin,rom");
+ m_romslot[0]->set_device_load(device_image_load_delegate(&electron_romp144_device::device_image_load_rom0, this));
+ GENERIC_SOCKET(config, m_romslot[1], generic_plain_slot, "electron_rom", "bin,rom");
+ m_romslot[1]->set_device_load(device_image_load_delegate(&electron_romp144_device::device_image_load_rom1, this));
+ GENERIC_SOCKET(config, m_romslot[2], generic_plain_slot, "electron_rom", "bin,rom");
+ m_romslot[2]->set_device_load(device_image_load_delegate(&electron_romp144_device::device_image_load_rom2, this));
+ GENERIC_SOCKET(config, m_romslot[3], generic_plain_slot, "electron_rom", "bin,rom");
+ m_romslot[3]->set_device_load(device_image_load_delegate(&electron_romp144_device::device_image_load_rom3, this));
+ GENERIC_SOCKET(config, m_romslot[4], generic_plain_slot, "electron_rom", "bin,rom");
+ m_romslot[4]->set_device_load(device_image_load_delegate(&electron_romp144_device::device_image_load_rom4, this));
+ GENERIC_SOCKET(config, m_romslot[5], generic_plain_slot, "electron_rom", "bin,rom");
+ m_romslot[5]->set_device_load(device_image_load_delegate(&electron_romp144_device::device_image_load_rom5, this));
+ GENERIC_SOCKET(config, m_romslot[6], generic_plain_slot, "electron_rom", "bin,rom");
+ m_romslot[6]->set_device_load(device_image_load_delegate(&electron_romp144_device::device_image_load_rom6, this));
+}
+
+//**************************************************************************
+// LIVE DEVICE
+//**************************************************************************
+
+//-------------------------------------------------
+// electron_romp144_device - constructor
+//-------------------------------------------------
+
+electron_romp144_device::electron_romp144_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
+ : device_t(mconfig, ELECTRON_ROMP144, tag, owner, clock)
+ , device_electron_cart_interface(mconfig, *this)
+ , m_romslot(*this, "rom%u", 7)
+{
+}
+
+//-------------------------------------------------
+// device_start - device-specific startup
+//-------------------------------------------------
+
+void electron_romp144_device::device_start()
+{
+ m_rom_select = 0xff;
+ m_rom_latch = 0xff;
+
+ save_item(NAME(m_rom_select));
+ save_item(NAME(m_rom_latch));
+}
+
+//-------------------------------------------------
+// read - cartridge data read
+//-------------------------------------------------
+
+uint8_t electron_romp144_device::read(offs_t offset, int infc, int infd, int romqa, int oe, int oe2)
+{
+ uint8_t data = 0xff;
+
+ if (oe)
+ {
+ if (romqa)
+ {
+ if ((m_rom_select & 0x07) == 0x00)
+ data = m_ram[offset & 0x3fff];
+ else
+ data = m_romslot[(m_rom_select & 0x07) - 1]->read_rom(offset & 0x3fff);
+ }
+ else
+ {
+ if ((m_rom_select & 0x0f) == 0x08)
+ data = m_ram[(offset & 0x3fff) | 0x4000];
+ else
+ data = m_rom[offset & 0x1fff];
+
+ /* roms selected with a read to latch */
+ if ((offset & 0x3f00) == 0x3f00)
+ {
+ m_rom_latch = offset & 0x0f;
+ }
+ }
+ }
+
+ return data;
+}
+
+//-------------------------------------------------
+// write - cartridge data write
+//-------------------------------------------------
+
+void electron_romp144_device::write(offs_t offset, uint8_t data, int infc, int infd, int romqa, int oe, int oe2)
+{
+ if (oe)
+ {
+ if (romqa)
+ {
+ if ((m_rom_select & 0x07) == 0x00)
+ m_ram[offset & 0x3fff] = data;
+ }
+ else
+ {
+ if ((m_rom_select & 0x0f) == 0x08)
+ m_ram[(offset & 0x3fff) | 0x4000] = data;
+
+ /* roms selected with a write to select */
+ if ((offset & 0x3f00) == 0x3f00)
+ {
+ /* does the write match the read (upper RAM cannot be de-selected to protect *RSUBSTITUTE) */
+ if (m_rom_latch == (offset & 0x0f) && m_rom_select != 0x08)
+ {
+ m_rom_select = m_rom_latch;
+ }
+ }
+ }
+ }
+}
+
+
+//**************************************************************************
+// IMPLEMENTATION
+//**************************************************************************
+
+image_init_result electron_romp144_device::load_rom(device_image_interface &image, generic_slot_device *slot)
+{
+ uint32_t size = slot->common_get_size("rom");
+
+ // socket accepts 8K and 16K ROM only
+ if (size != 0x2000 && size != 0x4000)
+ {
+ image.seterror(IMAGE_ERROR_UNSPECIFIED, "Invalid size: Only 8K/16K is supported");
+ return image_init_result::FAIL;
+ }
+
+ slot->rom_alloc(0x4000, GENERIC_ROM8_WIDTH, ENDIANNESS_LITTLE);
+ slot->common_load_rom(slot->get_rom_base(), size, "rom");
+
+ // mirror 8K ROMs
+ uint8_t *crt = slot->get_rom_base();
+ if (size <= 0x2000) memcpy(crt + 0x2000, crt, 0x2000);
+
+ return image_init_result::PASS;
+}