src/hardware/pc98.cpp

#include "dosbox.h"
#include "setup.h"
#include "video.h"
#include "pic.h"
#include "vga.h"
#include "regs.h"
#include "menu.h"
#include "programs.h"
#include "support.h"
#include "setup.h"
#include "timer.h"
#include "mem.h"
#include "callback.h"
#include "util_units.h"
#include "control.h"
#include "mixer.h"

#include <string.h>
#include <stdlib.h>
#include <string>
#include <stdio.h>

using namespace std;

extern bool gdc_5mhz_mode_initial;
extern bool gdc_5mhz_mode;
extern bool enable_pc98_egc;
extern bool enable_pc98_grcg;

void gdc_5mhz_mode_update_vars(void);
void gdc_egc_enable_update_vars(void);
void gdc_grcg_enable_update_vars(void);

/* ====================== PC98UTIL.COM ====================== */
class PC98UTIL : public Program {
public:
        void Run(void) {
        string arg;
                bool got_opt=false;
                
        cmd->BeginOpt();
        while (cmd->GetOpt(/*&*/arg)) {
                        got_opt=true;
            if (arg == "?" || arg == "help") {
                doHelp();
                break;
            }
            else if (arg == "egc") {
                enable_pc98_egc = true;
                WriteOut("EGC graphics functions enabled\n");
                gdc_egc_enable_update_vars();
                                if (!enable_pc98_grcg) { //Enable GRCG if not enabled
                                        enable_pc98_grcg = true;
                                        gdc_grcg_enable_update_vars();
                                }
#if defined(WIN32) && !defined(C_SDL2)
                                int Reflect_Menu(void);
                                Reflect_Menu();
#endif
            }
            else if (arg == "noegc") {
                enable_pc98_egc = false;
                WriteOut("EGC graphics functions disabled\n");
                gdc_egc_enable_update_vars();
#if defined(WIN32) && !defined(C_SDL2)
                                int Reflect_Menu(void);
                                Reflect_Menu();
#endif
            }
            else if (arg == "gdc25") {
                gdc_5mhz_mode_initial = gdc_5mhz_mode = false;
                gdc_5mhz_mode_update_vars();
                LOG_MSG("PC-98: GDC is running at %.1fMHz.",gdc_5mhz_mode ? 5.0 : 2.5);
                WriteOut("GDC is now running at 2.5MHz\n");
#if defined(WIN32) && !defined(C_SDL2)
                                int Reflect_Menu(void);
                                Reflect_Menu();
#endif
                mainMenu.get_item("pc98_5mhz_gdc").check(gdc_5mhz_mode).refresh_item(mainMenu);
            }
            else if (arg == "gdc50") {
                gdc_5mhz_mode_initial = gdc_5mhz_mode = true;
                gdc_5mhz_mode_update_vars();
                LOG_MSG("PC-98: GDC is running at %.1fMHz.",gdc_5mhz_mode ? 5.0 : 2.5);
                WriteOut("GDC is now running at 5MHz\n");
#if defined(WIN32) && !defined(C_SDL2)
                int Reflect_Menu(void);
                Reflect_Menu();
#endif
                mainMenu.get_item("pc98_5mhz_gdc").check(gdc_5mhz_mode).refresh_item(mainMenu);
            }
            else if (arg == "24khz") {
                // use the BIOS INT 18h
                reg_ah = 0x31;//get
                CALLBACK_RunRealInt(0x18);

                reg_ah = 0x30;//set
                reg_al &= ~(3u << 2u);// clear bits [3:2]
                reg_al |=   0x08;//24khz  bits [3:2] = 10
                CALLBACK_RunRealInt(0x18);

                reg_ah = 0x0c;//show text layer
                CALLBACK_RunRealInt(0x18);

                reg_ah = 0x11;//show cursor
                CALLBACK_RunRealInt(0x18);

                WriteOut("Hsync is now 24khz");
            }
            else if (arg == "31khz") {
                // use the BIOS INT 18h
                reg_ah = 0x31;//get
                CALLBACK_RunRealInt(0x18);

                reg_ah = 0x30;//set
                reg_al |= 0x0C;//31khz  bits [3:2] = 11
                CALLBACK_RunRealInt(0x18);

                reg_ah = 0x0c;//show text layer
                CALLBACK_RunRealInt(0x18);

                reg_ah = 0x11;//show cursor
                CALLBACK_RunRealInt(0x18);

                WriteOut("Hsync is now 31khz");
            }
            else {
                WriteOut("Unknown switch %s",arg.c_str());
                break;
            }
        }
        cmd->EndOpt();
                if(!got_opt) doHelp();
        }
    void doHelp(void) {
        WriteOut("PC98UTIL PC-98 emulation utility\n");
        WriteOut("  /gdc25     Set GDC to 2.5MHz\n");
        WriteOut("  /gdc50     Set GDC to 5.0MHz\n");
        WriteOut("  /egc       Enable EGC\n");
        WriteOut("  /noegc     Disable EGC\n");
        WriteOut("  /24khz     Set hsync to 24KHz\n");
        WriteOut("  /31khz     Set hsync to 31KHz\n");
    }
};

void PC98UTIL_ProgramStart(Program * * make) {
        *make=new PC98UTIL;
}
/*==============================================*/

/* wait-delay I/O port of some kind */
void pc98_wait_write(Bitu port,Bitu val,Bitu iolen) {
    (void)iolen;//UNUSED
    (void)port;//UNUSED
    (void)val;//UNUSED
    unsigned int wait_cycles = (unsigned int)(CPU_CycleMax * 0.0006); /* 0.6us = 0.0006ms */

    CPU_Cycles -= (cpu_cycles_count_t)wait_cycles;
}