source: thomson/code/C/HxCHost/macros.h@ 645c148

// 5 : MO5 / 8: TO8

#ifndef PLATFORM
        #error "make TARGET=TO8 or make TARGET=MO5"
#endif

///////////////////////////////////////
// THOMSON.H
///////////////////////////////////////

/* MONITOR ZERO-PAGE */
#define KEY       (*(volatile unsigned char*)(MONBASE + 0x37))
#define DKOPC (*(volatile unsigned char*)(MONBASE + 0x48))
#define DKDRV (*(volatile unsigned char*)(MONBASE + 0x49))
/* 204A is unused */
#define DKTRK (*(volatile unsigned char*)(MONBASE + 0x4B))
#define DKSEC (*(volatile unsigned char*)(MONBASE + 0x4C))
#define DKSTA (*(volatile unsigned char*)(MONBASE + 0x4E))
#define DKBUF (*(volatile unsigned int*)(MONBASE + 0x4F))

#define DKint1 (*(volatile unsigned int*)(MONBASE + 0x52))

void printhex(unsigned char i);
extern unsigned char mark[];

/* HARDWARE */
#define FDC_STATUS (*(volatile unsigned char*)(FDCBASE))

////////////////////////////////////////
// MO5.H
////////////////////////////////////////

#if PLATFORM == 5
/*****************************************************************************
 * MOx CODE
 ****************************************************************************/
        #define MONBASE 0x2000
        #define FDCBASE 0xA7D0

        /* MONITOR ENTRY POINTS */
        #define mon_putc(car) { \
        asm("swi \t  \t; MO5 monitor\n"\
                    ".fcb \t2 \t; putc"\
                        ::"B" ((unsigned char) (car))\
                ); \
        }


#define write(track, sector, buffer) {\
                DKTRK = (unsigned char)track;\
                DKSEC = (unsigned char)sector;\
                DKOPC = 8;\
                DKBUF = (unsigned int)buffer;\
\
        asm("swi \t  \t; MO5 monitor\n"\
                    ".fcb \t0x26 \t; DKCONT"\
                        ); \
        }

        /* FLOPPY DRIVE MONITOR ROM */
inline void read(unsigned char track, unsigned char sector, unsigned char* output)
{
        for(;;)
        {
                DKTRK = (unsigned char)track;
                DKSEC = (unsigned char)sector;
                DKOPC = 2;
                DKBUF = (unsigned int)output;

        asm("swi \t  \t; MO5 monitor\n"
                    ".fcb \t0x26 \t; DKCONT"
                        );

                if (DKSTA == 0x44 || DKSTA == 0) return; // Sector read ok!
                printhex(DKSTA);
        }
}


/*
#define write(track, sector, buffer) {\
        DKBUF = (unsigned int)buffer; \
        asm("ORCC \t#0x50  \t \n"\
                "LDX  \t#0xA7D0 \t \n"\
                "LDU  \t0x204F  \t;DKBUF \n"\
                "STD  \t1,X    \t \n"\
                "LEAY \t3,X    \t \n"\
                "LDA  \t#0xA8  \t \n"\
                "STA  \t,X     \t \n"\
                "BSR  \t_delay  \t \n"\
                "BRA  \tdo     \t \n"\
                "load: \tSTA \t,U+ \n"\
                "do:  \tLDA \t,Y\n"\
                "wai: \tLDB \t,X\n"\
                "BITB \t#2     \t \n"\
                "BNE  \tload   \t \n"\
                "BITB \t#1     \t \n"\
                "BNE  \twai    \t \n"\
                "ANDCC \t#0xAF \t \n"\
                ::"d" ((unsigned int)(track<<8|sector))\
                :"x","y","u");\
}*/

// seeking with the system functions work fine on MO5
#define seek() ;

#else
/*****************************************************************************
 * TOx CODE
 ****************************************************************************/
        /* MONITOR ENTRY POINTS */
        #define mon_putc(car) { \
        asm("JSR \t0xE803  \t; TO8 PUTC\n"\
                        ::"B" ((unsigned char) (car))\
                ); \
        }

        #define MONBASE 0x6000

#define write(track, sector, buffer) {\
                DKTRK = (unsigned char)track;\
                DKSEC = (unsigned char)sector;\
                DKOPC = 8;\
                DKBUF = (unsigned int)buffer;\
\
        asm("JSR \t 0xE004 \t; TO8 DKCONT\n"\
                ); \
        }

        /* FLOPPY DRIVE MONITOR ROM */
inline void read(unsigned char track, unsigned char sector,
        unsigned char* output)
{
        for(;;)
        {
                DKTRK = (unsigned char)track;
                DKSEC = (unsigned char)sector;
                DKOPC = 2;
                DKBUF = (unsigned int)output;

        asm("JSR \t 0xE004 \t \n"); \

                if (DKSTA == 0x44 || DKSTA == 0) return; // Sector read ok!
                printhex(DKSTA);
        }
}

// The TO8 floppy ROM has a limitation at 127 tracks. We have to hack around
// it. to get to track 255.
inline void seek()
{
        // first, go on track 127
        DKTRK = 127;
        DKOPC = 2;
    asm("JSR \t 0xE004 \t \n"); \

        // Make the system think it's on track 79 (as that's what it will read from the HxC)
        DKint1 = 79;
        // Ask it to go to track 127 again (so we get to 127+127 = 254)
        DKTRK = 127;
        DKOPC = 2;
    asm("JSR \t 0xE004 \t \n"); \
        DKint1 = 79;
        // Ask it to go to track 127 again (so we get to 127+127 = 254)
        DKTRK = 127;
        DKOPC = 2;
    asm("JSR \t 0xE004 \t \n"); \
        DKint1 = 79;
        // Ask it to go to track 127 again (so we get to 127+127 = 254)
        DKTRK = 127;
        DKOPC = 2;
    asm("JSR \t 0xE004 \t \n"); \
        DKint1 = 79;
        // Ask it to go to track 127 again (so we get to 127+127 = 254)
        DKTRK = 127;
        DKOPC = 2;
    asm("JSR \t 0xE004 \t \n"); \
        DKint1 = 79;
        // Ask it to go to track 127 again (so we get to 127+127 = 254)
        DKTRK = 127;
        DKOPC = 2;
    asm("JSR \t 0xE004 \t \n"); \

        // Make the system think it's on track 255, so next commands don't try to
        // seek to it again the broken way
        DKint1 = 255;
}
#endif