moschannel2.java

本程序是在软件模拟的计算机系统上设计一个多道程序的操作系统MOS

//类通道2，实现从输出缓存区到打印机的功能；
public class MosChannel2 {
	private byte mos_chst = FinalVar.CHST_STAT_FREE;
	byte prt_times = 0;
	byte[] data = null;
	MosMM mm;
	String s = "";
	MosVar var = null;
	private int sbtemp = 0;

	public MosChannel2(MosMM mm, MosVar var) {
		this.mm = mm;
		this.var = var;
	}
//	启动通道2时，需传递所要输出字的地址，且每次启动只能打印一个安；
	public void startChannel2(int addr) {
		var.getMain().var_ioi_label.setText("2");
		data = mm.mmRead(addr, FinalVar.MM_READ_WORD);
		prtWrite();
		setPrtTime();
		var.getMain().mosp.var_out_label[4].setText("" + getPrtTime());
		var.getMain().var_ioi_label.setText("0");
	}

	private void prtWrite() {
		s = "          ";
		for(int i = 0;i < 4;i++) {
			s = s + (char)data[i];
		}
		var.prt_area.append(s + "\n");
		sbtemp = var.getMain().prt_scr_pane.getVerticalScrollBar().getMaximum();
		var.getMain().prt_scr_pane.getVerticalScrollBar().setValue(sbtemp);
	}

	public void setMosChst(byte mos_chst) {
		this.mos_chst = mos_chst;
		if(this.mos_chst == FinalVar.CHST_STAT_FREE){
			var.getMain().var_chan2_label.setText("闲");
		}
		else {
			var.getMain().var_chan2_label.setText("忙");
		}
	}

	public byte getMosChst() {
		return this.mos_chst;
	}

	public void setPrtTime() {
		prt_times++;
	}

	public byte getPrtTime() {
		return prt_times;
	}
}