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author Nigel Barnes <Pernod70@users.noreply.github.com>2019-11-07 18:06:55 +0000
committer Nigel Barnes <Pernod70@users.noreply.github.com>2019-11-07 18:07:40 +0000
commitd4df190a68330865a063cc27e063e5a149f0f658 (patch)
treec1a20ad11e5f2fba16143a7df88006588be31186 /src/devices/bus
parent7104687b70d49a636ac660464552ce8bb8b1a26a (diff)
autoc15: Added RAM disc device.
daisy: Corrected ROM SHA1 (nw)
Diffstat (limited to 'src/devices/bus')
-rw-r--r--src/devices/bus/bbc/exp/autocue.cpp100
-rw-r--r--src/devices/bus/bbc/exp/autocue.h51
-rw-r--r--src/devices/bus/bbc/exp/exp.cpp6
3 files changed, 154 insertions, 3 deletions
diff --git a/src/devices/bus/bbc/exp/autocue.cpp b/src/devices/bus/bbc/exp/autocue.cpp
new file mode 100644
index 00000000000..929f4eb2eaa
--- /dev/null
+++ b/src/devices/bus/bbc/exp/autocue.cpp
@@ -0,0 +1,100 @@
+// license:BSD-3-Clause
+// copyright-holders:Nigel Barnes
+/**********************************************************************
+
+ Autocue RAM Disc
+
+ The RAM is accessible through JIM (page &FD). One page is visible in JIM at a time.
+ The selected page is controlled by the two paging registers:
+
+ &FCFE Paging register MSB
+ &FCFF Paging register LSB
+
+ 256K board has 1024 pages &000 to &3FF
+ 512K board has 2048 pages &000 to &7FF
+
+**********************************************************************/
+
+
+#include "emu.h"
+#include "autocue.h"
+
+
+//**************************************************************************
+// DEVICE DEFINITIONS
+//**************************************************************************
+
+DEFINE_DEVICE_TYPE(BBC_AUTOCUE, bbc_autocue_device, "bbc_autocue", "Autocue RAM Disc");
+
+
+//-------------------------------------------------
+// device_add_mconfig - add device configuration
+//-------------------------------------------------
+
+void bbc_autocue_device::device_add_mconfig(machine_config &config)
+{
+ NVRAM(config, "nvram", nvram_device::DEFAULT_ALL_0);
+}
+
+//**************************************************************************
+// LIVE DEVICE
+//**************************************************************************
+
+//-------------------------------------------------
+// bbc_autocue_device - constructor
+//-------------------------------------------------
+
+bbc_autocue_device::bbc_autocue_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
+ : device_t(mconfig, BBC_AUTOCUE, tag, owner, clock)
+ , device_bbc_exp_interface(mconfig, *this)
+ , m_nvram(*this, "nvram")
+ , m_ram_page(0)
+{
+}
+
+//-------------------------------------------------
+// device_start - device-specific startup
+//-------------------------------------------------
+
+void bbc_autocue_device::device_start()
+{
+ /* ram disk - board with 8 x HM62256LFP-12 - 256K expandable to 512K */
+ m_ram = make_unique_clear<uint8_t[]>(0x40000);
+ m_nvram->set_base(m_ram.get(), 0x40000);
+}
+
+
+//**************************************************************************
+// IMPLEMENTATION
+//**************************************************************************
+
+void bbc_autocue_device::fred_w(offs_t offset, uint8_t data)
+{
+ switch (offset)
+ {
+ case 0xff: m_ram_page = (m_ram_page & 0x00ff) | (data << 8); break;
+ case 0xfe: m_ram_page = (m_ram_page & 0xff00) | (data << 0); break;
+ }
+ //logerror("Write ram_page=%04x\n", m_ram_page);
+}
+
+uint8_t bbc_autocue_device::jim_r(offs_t offset)
+{
+ uint8_t data = 0xff;
+
+ if (m_ram_page < 0x400)
+ {
+ data = m_ram[(m_ram_page << 8) | offset];
+ }
+ //logerror("Read %04x -> %02x\n", offset | 0xfd00, data);
+ return data;
+}
+
+void bbc_autocue_device::jim_w(offs_t offset, uint8_t data)
+{
+ //logerror("Write %04x <- %02x\n", offset | 0xfd00, data);
+ if (m_ram_page < 0x400)
+ {
+ m_ram[(m_ram_page << 8) | offset] = data;
+ }
+} \ No newline at end of file
diff --git a/src/devices/bus/bbc/exp/autocue.h b/src/devices/bus/bbc/exp/autocue.h
new file mode 100644
index 00000000000..0151e94e9bf
--- /dev/null
+++ b/src/devices/bus/bbc/exp/autocue.h
@@ -0,0 +1,51 @@
+// license:BSD-3-Clause
+// copyright-holders:Nigel Barnes
+/**********************************************************************
+
+ Autocue RAM Disc
+
+**********************************************************************/
+
+
+#ifndef MAME_BUS_BBC_EXP_AUTOCUE_H
+#define MAME_BUS_BBC_EXP_AUTOCUE_H
+
+#include "exp.h"
+#include "machine/nvram.h"
+
+//**************************************************************************
+// TYPE DEFINITIONS
+//**************************************************************************
+
+class bbc_autocue_device :
+ public device_t,
+ public device_bbc_exp_interface
+{
+public:
+ // construction/destruction
+ bbc_autocue_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
+
+protected:
+ // device-level overrides
+ virtual void device_start() override;
+
+ // optional information overrides
+ virtual void device_add_mconfig(machine_config &config) override;
+
+ virtual void fred_w(offs_t offset, uint8_t data) override;
+ virtual uint8_t jim_r(offs_t offset) override;
+ virtual void jim_w(offs_t offset, uint8_t data) override;
+
+private:
+ required_device<nvram_device> m_nvram;
+ std::unique_ptr<uint8_t[]> m_ram;
+
+ uint16_t m_ram_page;
+};
+
+
+// device type definition
+DECLARE_DEVICE_TYPE(BBC_AUTOCUE, bbc_autocue_device);
+
+
+#endif /* MAME_BUS_BBC_EXP_AUTOCUE_H */
diff --git a/src/devices/bus/bbc/exp/exp.cpp b/src/devices/bus/bbc/exp/exp.cpp
index 8bbc78889d7..4209249a0f9 100644
--- a/src/devices/bus/bbc/exp/exp.cpp
+++ b/src/devices/bus/bbc/exp/exp.cpp
@@ -149,12 +149,12 @@ void bbc_exp_slot_device::pb_w(uint8_t data)
// slot devices
-//#include "autocue.h"
+#include "autocue.h"
#include "mertec.h"
void bbc_exp_devices(device_slot_interface &device)
{
- //device.option_add("autocue", BBC_AUTOCUE); /* Autocue RAM disk board */
- device.option_add("mertec", BBC_MERTEC); /* Mertec Compact Companion */
+ device.option_add_internal("autocue", BBC_AUTOCUE); /* Autocue RAM disk board */
+ device.option_add("mertec", BBC_MERTEC); /* Mertec Compact Companion */
}