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https://github.com/holub/mame
synced 2025-04-18 22:49:58 +03:00
electron: added preliminary expansion port
This commit is contained in:
Nigel Barnes
parent
02879abeac
commit
364ac3ea14
@ -574,6 +574,19 @@ if (BUSES["ECONET"]~=null) then
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end
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---------------------------------------------------
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--
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--@src/devices/bus/electron/exp.h,BUSES["ELECTRON"] = true
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---------------------------------------------------
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if (BUSES["ELECTRON"]~=null) then
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files {
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MAME_DIR .. "src/devices/bus/electron/exp.cpp",
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MAME_DIR .. "src/devices/bus/electron/exp.h",
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}
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end
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---------------------------------------------------
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--
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--@src/devices/bus/ep64/exp.h,BUSES["EP64"] = true
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@ -618,6 +618,7 @@ BUSES["CRVISION"] = true
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BUSES["DMV"] = true
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BUSES["ECBBUS"] = true
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BUSES["ECONET"] = true
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BUSES["ELECTRON"] = true
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BUSES["EP64"] = true
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BUSES["EPSON_SIO"] = true
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BUSES["GAMEBOY"] = true
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@ -1067,7 +1068,7 @@ files {
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MAME_DIR .. "src/mame/machine/xbox.cpp",
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MAME_DIR .. "src/mame/includes/saturn.h",
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MAME_DIR .. "src/mame/drivers/saturn.cpp",
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MAME_DIR .. "src/mame/machine/saturn.cpp",
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MAME_DIR .. "src/mame/machine/saturn.cpp",
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}
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end
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--------------------------------------------------
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104
src/devices/bus/electron/exp.cpp
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104
src/devices/bus/electron/exp.cpp
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@ -0,0 +1,104 @@
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// license:BSD-3-Clause
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// copyright-holders:Nigel Barnes
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/**********************************************************************
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Electron Expansion Port emulation
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**********************************************************************/
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#include "exp.h"
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//**************************************************************************
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// DEVICE DEFINITIONS
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//**************************************************************************
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const device_type ELECTRON_EXPANSION_SLOT = &device_creator<electron_expansion_slot_device>;
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//**************************************************************************
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// DEVICE ELECTRON_EXPANSION CARD INTERFACE
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//**************************************************************************
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//-------------------------------------------------
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// device_electron_expansion_interface - constructor
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//-------------------------------------------------
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device_electron_expansion_interface::device_electron_expansion_interface(const machine_config &mconfig, device_t &device)
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: device_slot_card_interface(mconfig, device)
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{
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m_slot = dynamic_cast<electron_expansion_slot_device *>(device.owner());
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}
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//-------------------------------------------------
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// ~device_electron_expansion_card_interface - destructor
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//-------------------------------------------------
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device_electron_expansion_interface::~device_electron_expansion_interface()
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{
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}
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//**************************************************************************
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// LIVE DEVICE
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//**************************************************************************
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//-------------------------------------------------
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// electron_expansion_slot_device - constructor
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//-------------------------------------------------
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electron_expansion_slot_device::electron_expansion_slot_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) :
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device_t(mconfig, ELECTRON_EXPANSION_SLOT, "Expansion port", tag, owner, clock, "electron_expansion_slot", __FILE__),
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device_slot_interface(mconfig, *this)
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{
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}
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//-------------------------------------------------
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// device_start - device-specific startup
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//-------------------------------------------------
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void electron_expansion_slot_device::device_start()
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{
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m_card = dynamic_cast<device_electron_expansion_interface *>(get_card_device());
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}
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//-------------------------------------------------
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// device_reset - device-specific reset
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//-------------------------------------------------
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void electron_expansion_slot_device::device_reset()
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{
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if (get_card_device())
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{
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get_card_device()->reset();
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}
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}
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//-------------------------------------------------
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// SLOT_INTERFACE( electron_expansion_devices )
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//-------------------------------------------------
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// slot devices
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//#include "plus1.h"
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//#include "plus3.h"
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//#include "aplus3.h"
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//#include "aplus5.h"
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//#include "slogger.h"
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//#include "fbjoy.h"
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//#include "m2105.h"
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SLOT_INTERFACE_START( electron_expansion_devices )
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//SLOT_INTERFACE("plus1", ELECTRON_PLUS1)
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//SLOT_INTERFACE("plus3", ELECTRON_PLUS3)
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//SLOT_INTERFACE("aplus3", ELECTRON_APLUS3)
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//SLOT_INTERFACE("aplus5", ELECTRON_APLUS5)
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//SLOT_INTERFACE("slogger", ELECTRON_SLOGGER)
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//SLOT_INTERFACE("fbjoy", ELECTRON_FBJOY)
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//SLOT_INTERFACE("m2105", ELECTRON_M2105)
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SLOT_INTERFACE_END
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158
src/devices/bus/electron/exp.h
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158
src/devices/bus/electron/exp.h
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@ -0,0 +1,158 @@
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// license:BSD-3-Clause
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// copyright-holders:Nigel Barnes
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/**********************************************************************
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Electron Expansion Port emulation
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**********************************************************************
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Pinout:
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18V AC 2 1 18V AC
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AC RETURN 4 3 AC RETURN
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-5V 6 5 -5V
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0V 8 7 0V
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+5V 10 9 +5V
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16MHz 12 11 SOUND O/P
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PHI OUT 14 13 ÷13 IN
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NMI 16 15 RST
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R/W 18 17 IRQ
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D6 20 19 D7
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D4 22 21 D5
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D2 24 23 D3
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D0 26 25 D1
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NC 28 27 RDY
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SLOT 30 29 SLOT
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A14 32 31 A15
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A12 34 33 A13
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A10 36 35 A11
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A0 38 37 A9
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A2 40 39 A1
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A4 42 41 A3
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A6 44 43 A5
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A8 46 45 A7
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0V 48 47 0V
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+5V 50 49 +5V
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Signal Definitions:
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18V AC (pins 1,2) - These lines are connected directly to the output from the Electron mains power
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AC RETURNS (pins 3,4) - adaptor. A total of 6W may be drawn from these lines as long as no power is
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taken from +5V (pins 9,10,49,50). For safety reasons these lines must never
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be used as an AC input to the Electron.
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-5V (pins 5,6) - A -5V supply from the Electron. Up to 20mA (total) may safely be drawn
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from this line by expansion modules.
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0V (pins 7,8,47,48) - Ground. Expansion modules with their own power supply must have the 0V
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lines commoned with the Electron.
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+5V (pins 9,10,49,50) - A +5V supply from the Electron. Up to 500mA (total) may safely be drawn
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from this line by expansion modules as long as no power is taken from 18V
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AC (pins 1,2,3,4).
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SOUND O/P (pin 11) - Sound output. A 3V peak to peak source via a 1K series resistor from the
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Electron ULA.
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16 MHz (pin 12) - 16 Megahertz from the Electron main oscillator. This output may be used
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for clock generation within an expansion module.
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/13 IN (pin 13) - 16 Megahertz divided by 13. This output may be used for baud rate
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generation. If divided by 1024 it will give approximately 1200Hz.
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PHI OUT (pin 14) - The 6502 input clock. The low time is nominally 250ns. The high time may
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be 250ns (2MHz operation when reading ROMs) or 750ns or 1250ns
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(stretched clock for a 1MHz access, the length depending on the phase of the
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2MHz clock) or up to 40us (if in modes 0-3)
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RST (pin 15) - Reset (active low). This is an OUTPUT ONLY for the system reset line. It
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may be used to initialise expansion modules on power up and when the
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BREAK key is pressed.
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NMI (pin 16) - Non-Maskable Interrupt (negative edge triggered). This is the system NMI
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line which is open collector (wire-OR) and may be asserted by an expansion
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module. The pull-up resistor on this line inside the ULA is 3k3. Care must
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be taken to avoid masking other interrupts by holding the line low. Using
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NMI on the Electron requires knowledge of operating system protocols.
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IRQ (pin 17) - Interrupt Request (active low). This is the system IRQ line which is open
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collector (wire-OR) and may be asserted by an expansion module. The pull-
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up resistor on this line inside the ULA is 3k3. It is essential for the correct
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operation of the machine that interrupts to not occur until the software is
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capable of dealing with them. Interrupts on the Electron expansion bus should
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therefore be disabled on power-up and reset. Significant use of interrupt
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service time may affect other machine functions, eg the real time clock.
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R/W (pin 18) - The system read/write line from the 6502.
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D7-D0 (pins 19-26) - Bi-directional data bus. The direction of data is determined by R/W.
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RDY (pin 27) - 6502 ready line (active low). May be asserted by an expansion module to
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stop the processor when reading slow memory. This line works on read only
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(R/W=1).
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(pin 28) - No connection
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(pins 29,30) - Polarising key connector.
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A0-A15 (pins 31-46) - 6502 address bus.
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**********************************************************************/
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#pragma once
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#ifndef __ELECTRON_EXPANSION_SLOT__
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#define __ELECTRON_EXPANSION_SLOT__
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#include "emu.h"
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//**************************************************************************
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// CONSTANTS
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//**************************************************************************
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#define ELECTRON_EXPANSION_SLOT_TAG "exp"
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//**************************************************************************
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// INTERFACE CONFIGURATION MACROS
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//**************************************************************************
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#define MCFG_ELECTRON_EXPANSION_SLOT_ADD(_tag, _slot_intf, _def_slot) \
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MCFG_DEVICE_ADD(_tag, ELECTRON_EXPANSION_SLOT, 0) \
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MCFG_DEVICE_SLOT_INTERFACE(_slot_intf, _def_slot, false)
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#define MCFG_ELECTRON_PASSTHRU_EXPANSION_SLOT_ADD() \
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MCFG_ELECTRON_EXPANSION_SLOT_ADD(ELECTRON_EXPANSION_SLOT_TAG, 0, electron_expansion_devices, nullptr)
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//**************************************************************************
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// TYPE DEFINITIONS
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//**************************************************************************
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// ======================> electron_expansion_slot_device
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class device_electron_expansion_interface;
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class electron_expansion_slot_device : public device_t,
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public device_slot_interface
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{
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public:
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// construction/destruction
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electron_expansion_slot_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
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virtual ~electron_expansion_slot_device() {}
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protected:
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// device-level overrides
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virtual void device_start() override;
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virtual void device_reset() override;
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device_electron_expansion_interface *m_card;
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};
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// ======================> device_electron_expansion_card_interface
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class device_electron_expansion_interface : public device_slot_card_interface
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{
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public:
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// construction/destruction
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device_electron_expansion_interface(const machine_config &mconfig, device_t &device);
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virtual ~device_electron_expansion_interface();
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protected:
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electron_expansion_slot_device *m_slot;
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};
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// device type definition
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extern const device_type ELECTRON_EXPANSION_SLOT;
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SLOT_INTERFACE_EXTERN( electron_expansion_devices );
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#endif
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@ -223,6 +223,9 @@ static MACHINE_CONFIG_START( electron, electron_state )
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MCFG_GENERIC_CARTSLOT_ADD("cartslot", generic_plain_slot, "electron_cart")
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MCFG_GENERIC_LOAD(electron_state, electron_cart)
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/* expansion ports */
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MCFG_ELECTRON_EXPANSION_SLOT_ADD("exp", electron_expansion_devices, nullptr)
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/* software lists */
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MCFG_SOFTWARE_LIST_ADD("cass_list","electron_cass")
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MCFG_SOFTWARE_LIST_ADD("cart_list","electron_cart")
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@ -16,6 +16,7 @@
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#include "imagedev/cassette.h"
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#include "sound/beep.h"
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#include "bus/electron/exp.h"
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#include "bus/generic/slot.h"
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#include "bus/generic/carts.h"
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