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Diffstat (limited to 'src/devices/bus/bbc/1mhzbus/autoprom.cpp')
-rw-r--r--src/devices/bus/bbc/1mhzbus/autoprom.cpp188
1 files changed, 188 insertions, 0 deletions
diff --git a/src/devices/bus/bbc/1mhzbus/autoprom.cpp b/src/devices/bus/bbc/1mhzbus/autoprom.cpp
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index 00000000000..0bf0b0cfefd
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+++ b/src/devices/bus/bbc/1mhzbus/autoprom.cpp
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+// license:BSD-3-Clause
+// copyright-holders:Nigel Barnes
+/**********************************************************************
+
+ ATPL AutoPrommer - Eprom Programmer with Auto-Run
+
+ Emulation is purely based upon contents of boot ROM. The manual
+ is apparently quite detailed, according to reviews, but has not
+ been found.
+
+ Emulating an EPROM programmer is not very useful but the Auto-Run
+ on this device makes it different. The Auto-Run ROMs are paged into
+ JIM at startup, and as very few devices make use of this feature
+ it provides a good test case.
+
+**********************************************************************/
+
+
+#include "emu.h"
+#include "autoprom.h"
+
+
+//**************************************************************************
+// DEVICE DEFINITIONS
+//**************************************************************************
+
+DEFINE_DEVICE_TYPE(BBC_AUTOPROM, bbc_autoprom_device, "bbc_autoprom", "ATPL AutoPrommer")
+
+
+//-------------------------------------------------
+// INPUT_PORTS( autoprom )
+//-------------------------------------------------
+
+static INPUT_PORTS_START( autoprom )
+ PORT_START("boot")
+ PORT_DIPNAME(0x03, 0x01, "EPROM") PORT_DIPLOCATION("BOOT:1,2")
+ PORT_DIPSETTING(0x00, "Disable Auto-Run")
+ PORT_DIPSETTING(0x01, "4K")
+ PORT_DIPSETTING(0x02, "8K")
+ PORT_DIPSETTING(0x03, "16K")
+ PORT_DIPNAME(0x04, 0x04, "Program") PORT_DIPLOCATION("BOOT:3")
+ PORT_DIPSETTING(0x00, "BASIC")
+ PORT_DIPSETTING(0x04, "M/C")
+ PORT_DIPNAME(0x08, 0x08, "OS") PORT_DIPLOCATION("BOOT:4")
+ PORT_DIPSETTING(0x00, "0.1")
+ PORT_DIPSETTING(0x08, "1.x")
+INPUT_PORTS_END
+
+
+//-------------------------------------------------
+// input_ports - device-specific input ports
+//-------------------------------------------------
+
+ioport_constructor bbc_autoprom_device::device_input_ports() const
+{
+ return INPUT_PORTS_NAME( autoprom );
+}
+
+//-------------------------------------------------
+// ROM( autoprom )
+//-------------------------------------------------
+
+ROM_START( autoprom )
+ ROM_REGION(0x8000, "autorun", 0)
+ // 2 Auto-Run sockets, each can take 2732/2764/27128 types
+ ROM_LOAD("prommer.rom", 0x0000, 0x2000, CRC(9ec497ec) SHA1(48d76606d55bfce866baac1d9ac6390f5243c244))
+ ROM_RELOAD(0x2000, 0x2000)
+ ROM_LOAD("boot.rom", 0x4000, 0x1000, CRC(0843bb06) SHA1(9f584f0cc54bbbf6128e96f5f97fa811cc3d68ce))
+ ROM_RELOAD(0x5000, 0x1000)
+ ROM_RELOAD(0x6000, 0x1000)
+ ROM_RELOAD(0x7000, 0x1000)
+ROM_END
+
+//-------------------------------------------------
+// device_add_mconfig - add device configuration
+//-------------------------------------------------
+
+void bbc_autoprom_device::device_add_mconfig(machine_config &config)
+{
+}
+
+//-------------------------------------------------
+// rom_region - device-specific ROM region
+//-------------------------------------------------
+
+const tiny_rom_entry *bbc_autoprom_device::device_rom_region() const
+{
+ return ROM_NAME( autoprom );
+}
+
+//**************************************************************************
+// LIVE DEVICE
+//**************************************************************************
+
+//-------------------------------------------------
+// bbc_autoprom_device - constructor
+//-------------------------------------------------
+
+bbc_autoprom_device::bbc_autoprom_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
+ : device_t(mconfig, BBC_AUTOPROM, tag, owner, clock)
+ , device_bbc_1mhzbus_interface(mconfig, *this)
+ , m_autorun(*this, "autorun")
+ , m_boot(*this, "boot")
+{
+}
+
+//-------------------------------------------------
+// device_start - device-specific startup
+//-------------------------------------------------
+
+void bbc_autoprom_device::device_start()
+{
+ save_item(NAME(m_rom_offset));
+}
+
+//-------------------------------------------------
+// device_reset - device-specific reset
+//-------------------------------------------------
+
+void bbc_autoprom_device::device_reset()
+{
+ m_slot->irq_w(ASSERT_LINE);
+}
+
+
+//**************************************************************************
+// IMPLEMENTATION
+//**************************************************************************
+
+uint8_t bbc_autoprom_device::fred_r(offs_t offset)
+{
+ uint8_t data = 0xff;
+
+ switch (offset)
+ {
+ case 0xc0:
+ data = m_unk_c0;
+ break;
+ case 0xc1:
+ data = m_autorun->base()[m_rom_offset];
+ break;
+ case 0xcc:
+ break;
+ case 0xd0:
+ data = (m_rom_offset >> 8) & 0xff;
+ break;
+ case 0xd1:
+ data = (m_rom_offset >> 0) & 0xff;
+ break;
+ case 0xdc:
+ break;
+ }
+
+ return data;
+}
+
+void bbc_autoprom_device::fred_w(offs_t offset, uint8_t data)
+{
+ switch (offset)
+ {
+ case 0xc0:
+ m_unk_c0 = data;
+ break;
+ case 0xc1:
+ break;
+ case 0xcc:
+ break;
+ case 0xd0:
+ m_rom_offset = (m_rom_offset & 0x00ff) | (data << 8);
+ break;
+ case 0xd1:
+ m_rom_offset = (m_rom_offset & 0xff00) | (data << 0);
+ break;
+ case 0xdc:
+ break;
+ }
+}
+
+uint8_t bbc_autoprom_device::jim_r(offs_t offset)
+{
+ // not known when to clear the IRQ, but has been acknowledged to get here
+ if (!machine().side_effects_disabled())
+ {
+ if (offset == 0xfe) m_slot->irq_w(CLEAR_LINE);
+ }
+ // the switches seem to determine which page of the boot ROM is accessed via JIM
+ return m_autorun->base()[0x4000 | ((m_boot->read() << 8) + offset)];
+}