private void seek(int driveNum, int head, int cyl) {
this.statusRegMain &= ~STM_BUSY;
this.statusReg0 = 0;
if ((driveNum >= 0) && (driveNum < this.seekStatus.length)) {
this.seekStatus[driveNum] = ((head << 2) & HEAD_MASK) | driveNum;
FloppyDiskDrive drive = getDrive(driveNum);
if (drive != null) {
if (drive.getCylinder() == cyl) {
this.seekStatus[driveNum] |= ST0_SEEK_END;
this.interruptReq = true;
} else {
if (driveNum > 0) {
this.statusRegMain |= (1 << driveNum);
} else {
this.statusRegMain |= 0x01;
}
drive.setSeekMode(head, cyl);
this.remainSeekSteps[driveNum] = 77;
if (!this.seekMode) {
this.tStateStepCounter = 0;
this.seekMode = true;
}
}
} else {
this.seekStatus[driveNum] |= ST0_ABNORMAL_TERMINATION;
this.seekStatus[driveNum] |= ST0_NOT_READY;
this.seekStatus[driveNum] |= ST0_SEEK_END;
this.interruptReq = true;
}
} else {
this.statusReg0 |= ST0_ABORT_BECAUSE_READY_CHANGED;
this.statusReg0 |= ST0_SEEK_END;
this.statusReg0 |= ST0_NOT_READY;
this.statusReg0 |= ((head << 2) & HEAD_MASK);
this.statusReg0 |= (driveNum & DRIVE_MASK);
this.interruptReq = true;
}
}
