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COLDLD.s

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+10		;OUP/M COLDLD WRITTEN BY SHAO,JIAN-XIONG 
+20		;ON JULY 1982.
+30		*=$2200
+40		JMP		CDBTLD
+50		BIOSA1	.WORD	$2280 
+60		BIOSA2	.WORD	$DE00 
+70		BIOSPG	.BYTE	$0C
+80		MVREG1=$53
+90		MVREG2=$55
+100		IOBFFG=$39 
+110		TKNDER=$44 
+120		TRKCRN=$48 
+130		DVACIA=$C010 
+140		FRYCST=$E41B 
+150		WBOOT=$E477 
+160		BOOT=$E42F
+170		SFTSWT=$F701
+180		FRYCCT	.BYTE $31,$31,$31,$31,$31
+190				.BYTE $62,$62,$62,$62 
+200				.BYTE $A0,$A0,$A0,$A0
+210				.BYTE $A0,$A0,$A0,$A0
+220		;
+230			CDBTLD=*			;COLD BOOT LOADER
+240		;
+250		CLD						;MOVE BIOS AND PART OF
+260		LDA 	BIOSA1 			;BDOS TO ITS REGULAR POSITION
+270		STA 	MVREG1  
+280		LDA 	BIOSA1+1  
+290		STA 	MVREG1+1  
+300		LDA 	BIOSA2  
+310		STA 	MVREG2  
+320		LDA 	BIOSA2+1
+330		STA 	MVREG2+1 
+340		LDX		BIOSPG 
+350		LDY 	#$00
+360		C$BTLD=* 
+370		LDA		(MVREGl),Y 
+380		STA		(MVREG2),Y
+390		INY
+400		BNE		C$BTLD  	
+410		INC		MVREG1+1 	
+420		INC		MVREG2+1 	
+430		DEX		
+440		BNE		C$BTLD 	
+450		LDA		#$34			;ADJUST FREQUENCY
+460		STA		SFTSWT 				
+470		LDY		#$00	
+480		LDA		#$03	
+490		STA		DVACIA 	
+500		LDA		#$38
+510		STA		DVACIA 
+520		STA		DVACIA+1
+530		PHA	
+540		PLA	
+550		PHA	
+560		PLA	
+570		PHA	
+580		PLA	
+590		STX		DVACIA+1
+600		AD$TFY=* 
+610		LDA		DVACIA
+620		BMI		A$JTFY
+630		INY	
+640		BNE		AD$TFY
+650		A$JTFY=* 
+660		LDA		FRYCCT,Y 
+670		STA		FRYCST
+680		JSR		BOOT			;INITIALIZE ALL INTERFACE
+690		LDA		#$00 
+700		STA		IOBFFG
+710		STA		TKNDER			;MARK HEAD POSITION TO 0 
+720		STA		TRKCRN
+730		LDA		#$FF			;SET COLD BOOT FLAG
+740		TAX 
+750		TXS 
+760		PHA
+770		JMP		WBOOT			;WBOOT CCP AND REST OF BDOS
+