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authorGravatarGravatar R. Belmont <rb6502@users.noreply.github.com>2019-08-15 22:39:51 -0400
committerGravatarGravatar GitHub <noreply@github.com>2019-08-15 22:39:51 -0400
commit5ca8e228fddd7556f1bb64a2033f185d1b8da128 (patch) (github)
treea190fb681f5e338f7960edb2c2dfdb8fcb4e7ee0
parentc0d5dc1142127c93893b7a150f38144d8a8e46ef (diff)
parente133bf83cc098da97b50b87e55b4273372371a23 (diff)
downloadmame-5ca8e228fddd7556f1bb64a2033f185d1b8da128.tar.bz2
mame-5ca8e228fddd7556f1bb64a2033f185d1b8da128.zip
Merge pull request #5490 from 68bit/ss30-piaide
SS-30 PIA IDE hard disk interface
-rw-r--r--scripts/src/bus.lua2
-rw-r--r--src/devices/bus/ss50/interface.cpp2
-rw-r--r--src/devices/bus/ss50/piaide.cpp179
-rw-r--r--src/devices/bus/ss50/piaide.h15
4 files changed, 198 insertions, 0 deletions
diff --git a/scripts/src/bus.lua b/scripts/src/bus.lua
index 8317ec88cea..b55820fb163 100644
--- a/scripts/src/bus.lua
+++ b/scripts/src/bus.lua
@@ -1736,6 +1736,8 @@ if (BUSES["SS50"]~=null) then
MAME_DIR .. "src/devices/bus/ss50/mps2.h",
MAME_DIR .. "src/devices/bus/ss50/mpt.cpp",
MAME_DIR .. "src/devices/bus/ss50/mpt.h",
+ MAME_DIR .. "src/devices/bus/ss50/piaide.cpp",
+ MAME_DIR .. "src/devices/bus/ss50/piaide.h",
}
end
diff --git a/src/devices/bus/ss50/interface.cpp b/src/devices/bus/ss50/interface.cpp
index 0b1d8e6656f..b211de5612f 100644
--- a/src/devices/bus/ss50/interface.cpp
+++ b/src/devices/bus/ss50/interface.cpp
@@ -85,6 +85,7 @@
#include "bus/ss50/mps.h"
#include "bus/ss50/mps2.h"
#include "bus/ss50/mpt.h"
+#include "bus/ss50/piaide.h"
//**************************************************************************
// GLOBAL VARIABLES
@@ -225,4 +226,5 @@ void ss50_default_2rs_devices(device_slot_interface &device)
device.option_add("mps", SS50_MPS);
device.option_add("mps2", SS50_MPS2);
device.option_add("mpt", SS50_MPT);
+ device.option_add("piaide", SS50_PIAIDE);
}
diff --git a/src/devices/bus/ss50/piaide.cpp b/src/devices/bus/ss50/piaide.cpp
new file mode 100644
index 00000000000..c2b74c6873d
--- /dev/null
+++ b/src/devices/bus/ss50/piaide.cpp
@@ -0,0 +1,179 @@
+// license:BSD-3-Clause
+// copyright-holders:68bit
+/**********************************************************************
+
+ PIA IDE Hard Disk Interface
+
+ Note this interface does appear to have used an 8 bit IDE data path, and
+ does appear to have discarded every second byte of storage - this does not
+ appear to be mis-implementation here. FLEX uses 256 byte sectors so half
+ of the IDE 512 byte sector give the required fit.
+
+ Some emulators appear to have stripped out that second unused byte when
+ writing their disk images. So their disk images will need to be filled
+ when importing these images for use with this device. Also some emulators
+ appear tolerant of trailing unused data and their images might need to be
+ truncated to the length defined by the disk geomentry.
+
+ The FLEX drivers for the PIA IDE appear to translate FLEX virtual track
+ and sector ID's into a target geometry. The disk geometry will likely need
+ to be defined and that can be done by using the MAME CHD disk format. The
+ range of FLEX tracks and sectors is limited to 0 to 255 so it needs to use
+ that full virtual range get the largest usable partitions. The drivers
+ support multiple partitions that appears as multiple disks to FLEX to make
+ use of more storage.
+
+ A similar (compatible) interface appears to have been used by the 'PT69'
+ SBC and drivers and disks targeting the PT69 have also run with this
+ device. The 'PT69' appears to place the PIA at 0xe010 to 0xe013 and it's
+ supporting ROM based at 0xf000, in contrast to the MAME swtpc09i machine
+ which places the PIA IDE in IO6 at 0xe060 (so that the DC5 FDC can remain
+ at IO1) and places the supporting ROM at $e800. The MAME swtpc09i machine
+ has booted some PT69 disk images with some minor software changes.
+
+**********************************************************************/
+
+#include "emu.h"
+#include "piaide.h"
+
+#include "machine/6821pia.h"
+#include "machine/idectrl.h"
+
+//**************************************************************************
+// TYPE DEFINITIONS
+//**************************************************************************
+
+// ======================> ss50_piaide_device
+
+class ss50_piaide_device : public device_t, public ss50_card_interface
+{
+public:
+ // construction/destruction
+ ss50_piaide_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock)
+ : device_t(mconfig, SS50_PIAIDE, tag, owner, clock)
+ , ss50_card_interface(mconfig, *this)
+ , m_pia(*this, "pia")
+ , m_ide(*this, "ide")
+ {
+ }
+
+protected:
+ // device-specific overrides
+ virtual void device_add_mconfig(machine_config &config) override;
+ virtual void device_start() override { }
+
+ // interface-specific overrides
+ virtual uint8_t register_read(offs_t offset) override;
+ virtual void register_write(offs_t offset, uint8_t data) override;
+
+private:
+ optional_device<pia6821_device> m_pia;
+ optional_device<ide_controller_device> m_ide;
+
+ uint8_t m_pia_porta;
+ uint8_t m_pia_portb;
+
+ DECLARE_READ8_MEMBER(pia_a_r);
+ DECLARE_READ8_MEMBER(pia_b_r);
+ DECLARE_WRITE8_MEMBER(pia_a_w);
+ DECLARE_WRITE8_MEMBER(pia_b_w);
+
+};
+
+//-------------------------------------------------
+// device_add_mconfig - add device-specific
+// machine configuration
+//-------------------------------------------------
+
+void ss50_piaide_device::device_add_mconfig(machine_config &config)
+{
+ PIA6821(config, m_pia, 0);
+ m_pia->readpa_handler().set(FUNC(ss50_piaide_device::pia_a_r));
+ m_pia->readpb_handler().set(FUNC(ss50_piaide_device::pia_b_r));
+ m_pia->writepa_handler().set(FUNC(ss50_piaide_device::pia_a_w));
+ m_pia->writepb_handler().set(FUNC(ss50_piaide_device::pia_b_w));
+
+ IDE_CONTROLLER(config, m_ide).options(ata_devices, "hdd", nullptr, false);
+}
+
+//-------------------------------------------------
+// register_read - read from a port register
+//-------------------------------------------------
+
+uint8_t ss50_piaide_device::register_read(offs_t offset)
+{
+ return m_pia->read(offset & 3);
+}
+
+//-------------------------------------------------
+// register_write - write to a port register
+//-------------------------------------------------
+
+void ss50_piaide_device::register_write(offs_t offset, uint8_t data)
+{
+ m_pia->write(offset & 3, data);
+}
+
+/******* MC6821 PIA on IDE Board *******/
+/* Read/Write handlers for pia ide */
+
+READ8_MEMBER( ss50_piaide_device::pia_a_r )
+{
+ return m_pia_porta;
+}
+
+READ8_MEMBER( ss50_piaide_device::pia_b_r )
+{
+ return m_pia_portb;
+}
+
+WRITE8_MEMBER( ss50_piaide_device::pia_a_w )
+{
+ m_pia_porta = data;
+}
+
+WRITE8_MEMBER( ss50_piaide_device::pia_b_w )
+{
+ uint16_t tempidedata;
+
+ m_pia_portb = data;
+
+ // Pass through a 16 bit accessor to the IDE bus.
+ uint8_t low = (data & 0x04) >> 2;
+ uint8_t high = (data & 0x18) >> 3;
+ uint16_t ide_mem_mask = low ? 0xff00 : 0x00ff;
+
+ if ((data & 0x40)&&(!(data&0x20))) //cs0=0 cs1=1 bit 5&6
+ {
+ if (!(data & 0x02)) //rd line bit 1
+ {
+ tempidedata = m_ide->read_cs0(high, ide_mem_mask);
+ logerror("ide_bus_r: offset $%02X data %04X\n", (data&0x1c)>>2, tempidedata);
+ m_pia_porta = low ? tempidedata >> 8 : tempidedata & 0x00ff;
+ }
+ else if (!(data & 0x01)) //wr line bit 0
+ {
+ uint16_t ide_data = low ? m_pia_porta << 8: m_pia_porta;
+ m_ide->write_cs0(high, ide_data, ide_mem_mask);
+ logerror("ide_bus_w: offset $%02X data %04X\n", (data&0x1c)>>2, m_pia_porta);
+ }
+ }
+ else if ((data & 0x20)&&(!(data&0x40))) //cs0=1 cs1=0 bit 5&6
+ {
+ if (!(data & 0x02)) //rd line bit 1
+ {
+ tempidedata = m_ide->read_cs1(high, ide_mem_mask);
+ logerror("ide_bus_r: offset $%02X data %04X\n", (data&0x1c)>>2, tempidedata);
+ m_pia_porta = low ? tempidedata >> 8 : tempidedata & 0x00ff;
+ }
+ else if (!(data & 0x01)) //wr line bit 0
+ {
+ uint16_t ide_data = low ? m_pia_porta << 8: m_pia_porta;
+ m_ide->write_cs1(high, ide_data, ide_mem_mask);
+ logerror("ide_bus_w: offset $%02X data %04X\n", (data&0x1c)>>2, m_pia_porta);
+ }
+ }
+}
+
+// device type definition
+DEFINE_DEVICE_TYPE_PRIVATE(SS50_PIAIDE, ss50_card_interface, ss50_piaide_device, "ss50_piaide", "PIA IDE Hard Disk Interface")
diff --git a/src/devices/bus/ss50/piaide.h b/src/devices/bus/ss50/piaide.h
new file mode 100644
index 00000000000..51fa31b58be
--- /dev/null
+++ b/src/devices/bus/ss50/piaide.h
@@ -0,0 +1,15 @@
+// license:BSD-3-Clause
+// copyright-holders:68bit
+/**********************************************************************
+
+ PIA IDE Hard Disk Interface
+
+**********************************************************************/
+#ifndef MAME_DEVICE_BUS_SS50_PIAIDE_H
+#define MAME_DEVICE_BUS_SS50_PIAIDE_H
+
+#include "interface.h"
+
+DECLARE_DEVICE_TYPE(SS50_PIAIDE, ss50_card_interface)
+
+#endif // MAME_DEVICE_BUS_SS50_PIAIDE_H