Function disk_doupdate_write

src/disk.cpp:4022–4112

}

static int disk_doupdate_write(int floppybits, int trackspeed)
{
	int dr;
	int drives[4];

	for (dr = 0; dr < MAX_FLOPPY_DRIVES; dr++) {
		drive *drv2 = &floppy[dr];
		drives[dr] = 0;
		if (drv2->motoroff)
			continue;
		if ((selected | disabled) & (1 << dr))
			continue;
		drives[dr] = 1;
	}

	while (floppybits >= trackspeed) {
		for (dr = 0; dr < MAX_FLOPPY_DRIVES; dr++) {
			if (drives[dr]) {
				drive *drv2 = &floppy[dr];
				drv2->mfmpos++;
				drv2->mfmpos %= drv2->tracklen;
				if (drive_at_index(drv2, drv2->mfmpos, drv2->mfmpos)) {
					do_disk_index();
				}
			}
		}
		if (dmaen(DMA_DISK) && dmaen(DMA_MASTER) && dskdmaen == DSKDMA_WRITE && dsklength > 0 && fifo_filled) {
			bitoffset++;
			bitoffset &= 15;
			if (!bitoffset) {
				// fast disk modes, fill the fifo instantly
				if (currprefs.floppy_speed > 100 && !fifo_inuse[0] && !fifo_inuse[1] && !fifo_inuse[2]) {
					while (!fifo_inuse[2]) {
						uae_u16 w = chipmem_wget_indirect (dskpt);
						DSKDAT (w);
						dskpt += 2;
					}
				}
				if (disk_fifostatus() >= 0) {
#ifdef FLOPPYBRIDGE
					bool wasBridge = false;
#endif
					uae_u16 w = DSKDATR(0);
					for (dr = 0; dr < MAX_FLOPPY_DRIVES; dr++) {
						drive *drv2 = &floppy[dr];
						if (drives[dr]) {
							drv2->bigmfmbuf[drv2->mfmpos >> 4] = w;
							drv2->bigmfmbuf[(drv2->mfmpos >> 4) + 1] = 0x5555;
							drv2->writtento = 1;
#ifdef FLOPPYBRIDGE
							if (drv2->bridge) {
								wasBridge = true;
								drv2->bridge->writeShortToBuffer(side, drv2->cyl, w, drv2->mfmpos);
							}
#endif
						}
#ifdef AMAX
						if (amax_enabled)