mirror of
https://github.com/NovaSquirrel/Mesen-X.git
synced 2024-06-01 02:48:18 -04:00
286 lines
7.3 KiB
C++
286 lines
7.3 KiB
C++
#pragma once
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#include "stdafx.h"
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#include "BaseMapper.h"
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#include "InternalRamHandler.h"
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//SSS-NROM-256 (Famicom box menu board)
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//Info from here: http://kevtris.org/mappers/famicombox/index6.html
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class FamicomBox : public BaseMapper
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{
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private:
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uint8_t _regs[8];
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uint8_t _extInternalRam[0x2000];
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InternalRamHandler<0x1FFF> _extendedRamHandler;
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protected:
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uint32_t GetDipSwitchCount() override { return 8; }
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uint16_t RegisterStartAddress() override { return 0x5000; }
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uint16_t RegisterEndAddress() override { return 0x5FFF; }
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uint16_t GetPRGPageSize() override { return 0x4000; }
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uint16_t GetCHRPageSize() override { return 0x2000; }
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bool AllowRegisterRead() override { return true; }
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void InitMapper() override
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{
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_regs[7] = 0xFF;
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SelectPRGPage(0, 0);
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SelectPRGPage(1, 1);
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SelectCHRPage(0, 0);
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_extendedRamHandler.SetInternalRam(_extInternalRam);
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}
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void StreamState(bool saving) override
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{
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BaseMapper::StreamState(saving);
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ArrayInfo<uint8_t> regs { _regs, 8 };
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ArrayInfo<uint8_t> extRam { _extInternalRam, 0x2000 };
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Stream(regs, extRam);
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}
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void Reset(bool softReset) override
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{
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for(int i = 0; i < 6; i++) {
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_regs[i] = 0;
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}
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_console->GetMemoryManager()->RegisterIODevice(&_extendedRamHandler);
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}
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uint8_t ReadRegister(uint16_t addr) override
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{
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switch(addr & 7) {
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case 0:
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/*
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5000R: Device which caused an exception (0 = this device caused the exception)
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-----
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0 - 6.82Hz interrupt source hit
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1 - 8 bit timer expired @ 5003W
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2 - controller(s) were read
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3 - keyswitch was rotated
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4 - money was inserted
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5 - reset button was pressed
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6 - watchdog timer expired (reading either controller resets this timer)
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7 - Pin 4 of "CATV connector" went high/open
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*/
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_regs[0] = 0xFF; // clear all exceptions
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return _regs[0];
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case 1:
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//5001R (not implemented)
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break;
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case 2:
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/*
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5002R Dip switch register
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DIP Switches Info:
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0x01 - Self Test. When on, unit will continuously self-test
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0x02 - Coin timeout period. off = 10 minutes, on = 20 minutes
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0x04 - not used
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0x08 - Famicombox menu time. off = 7 sec, on = 12 sec
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0x10 - attract time
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0x20 - attract time
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00: 12 seconds
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01: 17 seconds
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10: 23 seconds
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11: 7 seconds
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0x40 - Mode
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0x80 - Mode
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00: Key Mode
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01: CATV Mode
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10: Coin Mode
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11: Free Play
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*/
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return GetDipSwitches();
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case 3:
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/*5003R
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0 - key position 0 (1 = in this position)
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1 - key position 1
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2 - key position 2
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3 - key position 3
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4 - key position 4
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5 - key position 6
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6 - money system enabled (pin 9 of 3199)
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7 - pin 10 of 3199
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*/
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return 0x00; // 0, 1 - attract
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// 2
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// 4 - menu
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// 8 - self check and game casette check
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// 10 - lock?
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// 20 - game title & count display
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case 4:
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//5004R - DB-25 pins
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return 0;
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case 5:
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//5005R: The enable for this runs to pin 28 of the expansion connector.
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return 0;
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case 6:
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//5006R: The enable for this runs to pin 27 of the expansion connector.
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return 0;
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case 7:
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/*
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0 - TV type selection (1 = game, 0 = TV)
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1 - keyswitch turned (1 = in middle of positions)
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2 - 0 = zapper grounded
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3 - pin 21 of exp. conn. (inverted)
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4 - state of pin 8 of "CATV" connector, 0 = low, 1 = high
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5 - relay position. 0 = position A, 1 = position B
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6 - pin 22 of exp. conn. (inverted)
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7 - 5005.5W (inverted)
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*/
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return 0x22; // TV type, key not turned, relay B
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}
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return 0;
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}
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void WriteRegister(uint16_t addr, uint8_t value) override
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{
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//None of this is implemented
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switch(addr & 0x07) {
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case 0:
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/*
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5000W: Exception Trap enable register (reset to 00h on powerup only)
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-----
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0 - 6.82Hz interrupt source (0 = enable)
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1 - 8 bit timer expiration @ 5003W (1 = enable)
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2 - controller reads (1 = enable)
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3 - keyswitch rotation (1 = enable)
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4 - money insertion (1 = enable)
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5 - reset button (1 = enable)
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6 - not used
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7 - "CATV connector" pin 4 detection (1 = enable)
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*/
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break;
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case 1:
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/*
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5001W Money handling register (reset to 00h on power up only)
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-----
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0 - pin 1 of 2D(3199)
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1 - pin 2 of 2D(3199)
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2 - pin 3 of 2D(3199)
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3 - pin 4 of 2D(3199)
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4 - pin 12 of 2D(3199)
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5 - pin 14 of 2D(3199)
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6 - enable pin 7 of "CATV" connector, 1 = enable.when in TV mode, output goes low. else output stays high
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7 - inverter->pin 8 of "CATV" connector
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*/
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break;
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case 2:
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/*
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5002W LED & memory protect register (reset to 00h when CPU is reset)
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-----
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0 - LED sel 0
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1 - LED sel 1
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2 - LED sel 2
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3 - LED sel 3
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4 - Mem Protect 0
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5 - Mem protect 1
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6 - Mem protect 2
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7 - LED flash- high = flash, low = steady
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LED sel: 01-0fh selects one of the LEDs on the front, 0 = no LEDs
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Mem protect:
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0 - no RAM is writable
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1 - 0000-07ffh is writable
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2 - 0000-0fffh is writable
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3 - 0000-17ffh is writable
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4-7 - 0000-1fffh is writable
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*/
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break;
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case 3:
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/*
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5003W 8 bit down counter, for attract mode timing
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-----
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Writing to this location loads the counter with the 8 bit value written .
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It is clocked at a 6.8274Hz rate. When the timer wraps from 00h to ffh
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it triggers an exception, if it is enabled. (See 5000W and 5000R)
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This timer is used for the "attract" mode. It lets the game run for
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several seconds before it brings the menu back.
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*/
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break;
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case 4:
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/*
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5004W Cart control register (reset to 00h when CPU is reset)
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-----
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0 - cart 0
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1 - cart 1
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2 - cart 2
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3 - cart 3
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4 - row select 0
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5 - row select 1
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6 - Lock. writing a 1 here unmaps all hardware
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7 - NC
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cart: These 4 bits select which cartridge is active. Cartridge 0 is the
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menu cart inside the unit, carts 01-0fh are the carts on the front.
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row select: These bits select which row of carts is active.
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0 - only the internal menu cart is selected.
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1 - carts 1-5 are selected
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2 - carts 6-10 are selected
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3 - carts 11-15 are selected
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Proper cart selection requires setting up BOTH the desired cart # (00-0fh), AND
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the proper row. The menu software uses a small table to do this.
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*/
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break;
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case 5:
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/*
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5005W CATV and joypad control (reset to 00h on power up only)
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-----
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0 - 1 = flip latching relay to position A (coil on pins 1 & 10)
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1 - connects to 3199
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2 - turn zapper on. 1 = turn on
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3 - enable 40% input of modulator. 1 = enable, 0 = disable
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4 - NC
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5 - maps to 5007R.7
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6 - joypad enable- 1 = disable, 0 = enable
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7 - joypad swap. 1 = normal, 0 = swap swapping only swaps D0 and CLK
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*/
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break;
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case 6:
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/*
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5006W (not reset, unknown contents at powerup)
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-----
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0 - DB-25 pin 6
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1 - DB-25 pin 15
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2 - DB-25 pin 7
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3 - DB-25 pin 16
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4 - DB-25 pin 8
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5 - DB-25 pin 17
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6 - DB-25 pin 9
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7 - DB-25 pin 18
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*/
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break;
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case 7:
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/*
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5007W (not implemented)
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-----
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The enable for this runs to pin 26 of the expansion connector.
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*/
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break;
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}
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}
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};
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