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-rw-r--r--src/devices/bus/electron/cart/ap5.cpp171
1 files changed, 171 insertions, 0 deletions
diff --git a/src/devices/bus/electron/cart/ap5.cpp b/src/devices/bus/electron/cart/ap5.cpp
new file mode 100644
index 00000000000..660587c7642
--- /dev/null
+++ b/src/devices/bus/electron/cart/ap5.cpp
@@ -0,0 +1,171 @@
+// license:BSD-3-Clause
+// copyright-holders:Nigel Barnes
+/**********************************************************************
+
+ ACP Advanced Plus 5
+
+**********************************************************************/
+
+
+#include "emu.h"
+#include "ap5.h"
+
+
+//**************************************************************************
+// DEVICE DEFINITIONS
+//**************************************************************************
+
+DEFINE_DEVICE_TYPE(ELECTRON_AP5, electron_ap5_device, "electron_ap5", "P.R.E.S. Advanced Plus 5")
+
+
+//-------------------------------------------------
+// device_add_mconfig - add device configuration
+//-------------------------------------------------
+
+void electron_ap5_device::device_add_mconfig(machine_config &config)
+{
+ /* rom sockets */
+ GENERIC_SOCKET(config, m_romslot[0], generic_plain_slot, "electron_rom", "bin,rom"); // ROM SLOT 14
+ m_romslot[0]->set_device_load(device_image_load_delegate(&electron_ap5_device::device_image_load_rom1_load, this));
+ GENERIC_SOCKET(config, m_romslot[1], generic_plain_slot, "electron_rom", "bin,rom"); // ROM SLOT 15
+ m_romslot[1]->set_device_load(device_image_load_delegate(&electron_ap5_device::device_image_load_rom2_load, this));
+
+ /* via */
+ VIA6522(config, m_via, DERIVED_CLOCK(1, 16));
+ m_via->readpb_handler().set(m_userport, FUNC(bbc_userport_slot_device::pb_r));
+ m_via->writepb_handler().set(m_userport, FUNC(bbc_userport_slot_device::pb_w));
+ m_via->irq_handler().set(DEVICE_SELF_OWNER, FUNC(electron_cartslot_device::irq_w));
+
+ /* user port */
+ BBC_USERPORT_SLOT(config, m_userport, bbc_userport_devices, nullptr);
+ m_userport->cb1_handler().set(m_via, FUNC(via6522_device::write_cb1));
+ m_userport->cb2_handler().set(m_via, FUNC(via6522_device::write_cb2));
+
+ /* 1mhz bus port */
+ BBC_1MHZBUS_SLOT(config, m_1mhzbus, DERIVED_CLOCK(1, 16), bbc_1mhzbus_devices, nullptr);
+ m_1mhzbus->irq_handler().set(DEVICE_SELF_OWNER, FUNC(electron_cartslot_device::irq_w));
+ m_1mhzbus->nmi_handler().set(DEVICE_SELF_OWNER, FUNC(electron_cartslot_device::nmi_w));
+
+ /* tube port */
+ BBC_TUBE_SLOT(config, m_tube, electron_tube_devices, nullptr);
+ m_tube->irq_handler().set(DEVICE_SELF_OWNER, FUNC(electron_cartslot_device::irq_w));
+}
+
+//**************************************************************************
+// LIVE DEVICE
+//**************************************************************************
+
+//-------------------------------------------------
+// electron_ap5_device - constructor
+//-------------------------------------------------
+
+electron_ap5_device::electron_ap5_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
+ : device_t(mconfig, ELECTRON_AP5, tag, owner, clock)
+ , device_electron_cart_interface(mconfig, *this)
+ , m_via(*this, "via6522")
+ , m_tube(*this, "tube")
+ , m_1mhzbus(*this, "1mhzbus")
+ , m_userport(*this, "userport")
+ , m_romslot(*this, "rom%u", 1)
+{
+}
+
+//-------------------------------------------------
+// device_start - device-specific startup
+//-------------------------------------------------
+
+void electron_ap5_device::device_start()
+{
+}
+
+//-------------------------------------------------
+// read - cartridge data read
+//-------------------------------------------------
+
+uint8_t electron_ap5_device::read(offs_t offset, int infc, int infd, int romqa, int oe, int oe2)
+{
+ uint8_t data = 0xff;
+
+ if (infc)
+ {
+ data = m_1mhzbus->fred_r(offset);
+
+ switch (offset & 0xf0)
+ {
+ case 0xb0:
+ data &= m_via->read(offset & 0x0f);
+ break;
+
+ case 0xe0:
+ data &= m_tube->host_r(offset & 0x0f);
+ break;
+ }
+ }
+ else if (infd)
+ {
+ data = m_1mhzbus->jim_r(offset);
+ }
+ else if (oe)
+ {
+ data = m_romslot[romqa]->read_rom(offset & 0x3fff);
+ }
+ else if (oe2)
+ {
+ data = m_rom[offset & 0x1fff];
+ }
+
+ return data;
+}
+
+//-------------------------------------------------
+// write - cartridge data write
+//-------------------------------------------------
+
+void electron_ap5_device::write(offs_t offset, uint8_t data, int infc, int infd, int romqa, int oe, int oe2)
+{
+ if (infc)
+ {
+ m_1mhzbus->fred_w(offset, data);
+
+ switch (offset & 0xf0)
+ {
+ case 0xb0:
+ m_via->write(offset & 0x0f, data);
+ break;
+
+ case 0xe0:
+ m_tube->host_w(offset & 0x0f, data);
+ break;
+ }
+ }
+ else if (infd)
+ {
+ m_1mhzbus->jim_w(offset, data);
+ }
+}
+
+
+//**************************************************************************
+// IMPLEMENTATION
+//**************************************************************************
+
+image_init_result electron_ap5_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;
+}