Update md.asm

Optimizations

Source/HBIOS/md.asm

@@ -878,7 +878,7 @@ MD_CALCA:
 ;
 	LD	A,(HB_CURBNK)	; WE ARE STARTING IN HB_CURBNK
 ;
-	RET			; RETURN TO MD_FNRET
+	RET			
 ;
 ;======================================================================
 ; FLASH IDENTIFY
@@ -913,9 +913,9 @@ MD_FIDENT_R:				; THIS CODE GETS RELOCATED TO HIGH MEMORY
 	LD	(HL),A			; LD	($5555),A		; COMMAND
 ;
 	POP	AF			; RETURN TO ORIGINAL BANK
-	CALL	HBX_BNKSEL		; WHICH IS OUR RAM BIOS COPY
+	JP	HBX_BNKSEL		; WHICH IS OUR RAM BIOS COPY
 ;
-	RET				; RETURN TO MD_FNRET
+;	RET				
 ;
 MD_I_SZ	.EQU	$-MD_FIDENT_R		; SIZE OF RELOCATABLE CODE BUFFER REQUIRED
 ;
@@ -976,9 +976,9 @@ MD_WT4:	LD	A,(HL)			; DO TWO SUCCESSIVE READS
 MD_WT5:	LD	C,L			; SET SUCCESS STATUS
 ;
 MD_WT6:	POP	AF			; RETURN TO ORIGINAL BANK
-	CALL	HBX_BNKSEL		; WHICH IS OUR RAM BIOS COPY
+	JP	HBX_BNKSEL		; WHICH IS OUR RAM BIOS COPY
 ;
-	RET				; RETURN TO MD_FNRET
+;	RET				
 ;
 MD_S_SZ	.EQU	$-MD_FERAS_R		; SIZE OF RELOCATABLE CODE BUFFER REQUIRED
 ;
@@ -996,6 +996,7 @@ MD_S_SZ	.EQU	$-MD_FERAS_R		; SIZE OF RELOCATABLE CODE BUFFER REQUIRED
 ;          IX POINTS TO DATA TO BE WRITTEN
 ;          A  CONTAINS CURRENT BANK 
 ; ON EXIT  NO STATUS RETURNED
+;          AF' TRASHED
 ;======================================================================
 ;
 MD_FREAD_R:				; THIS CODE GETS RELOCATED TO HIGH MEMORY
@@ -1003,17 +1004,17 @@ MD_FREAD_R:				; THIS CODE GETS RELOCATED TO HIGH MEMORY
 	LD	H,C			; SECTOR
 	LD	L,D			; ADDRESS
 ;
-	PUSH	AF			; SAVE CURRENT BANK
+	EX	AF,AF'			; PUT DESTINATION BANK IN AF'
+	LD	A,B			; PUT SOURCE BANK IN AF
 ;
 MD_FRD1:	
-	LD	A,B			; SELECT BANK
-	CALL	HBX_BNKSEL		; TO READ
-	LD	C,(HL)			; READ BYTE
-;
-	POP	AF
-	PUSH	AF			; SELECT BANK
+	CALL	HBX_BNKSEL		; READ			; SWITCH TO SOURCE BANK
+	LD	C,(HL)			; BYTE
+;	
+	EX	AF,AF'			; SELECT BANK 		; SWITCH DESTINATION BANK
 	CALL	HBX_BNKSEL		; TO WRITE
 	LD	(IX+0),C		; WRITE BYTE
+	EX	AF,AF'			;			; PUT SOURCE BANK IN AF
 ;
 	INC	HL			; NEXT SOURCE LOCATION
 	INC	IX			; NEXT DESTINATION LOCATION
@@ -1021,11 +1022,8 @@ MD_FRD1:
 	INC	DE			; CONTINUE READING UNTIL
 	BIT	4,D			; WE HAVE DONE ONE SECTOR
 	JR	Z,MD_FRD1
-
-	POP	AF			; RETURN TO ORIGINAL BANK
-	CALL	HBX_BNKSEL		; WHICH IS OUR RAM BIOS COPY
 ;
-	RET				; RETURN TO MD_FNRET
+	RET				
 ;
 MD_R_SZ	.EQU	$-MD_FREAD_R		; SIZE OF RELOCATABLE CODE BUFFER REQUIRED
 ;
@@ -1059,7 +1057,7 @@ MD_FVE1:
 ;
 	POP	AF
 	PUSH	AF			; SELECT BANK
-	CALL	HBX_BNKSEL		; TO WRITE
+	CALL	HBX_BNKSEL		; TO VERIFY AGAINST
 ;
 	LD	A,C
 	SUB	(IX+0)			; COMPARE BYTE
@@ -1076,10 +1074,8 @@ MD_FVE1:
 	LD	C,E			; SET SUCCESS STATUS = 0
 ;
 MD_FVE2:
-	POP	AF			; RETURN TO ORIGINAL BANK
-	CALL	HBX_BNKSEL		; WHICH IS OUR RAM BIOS COPY
-;
-	RET				; RETURN TO MD_FNRET
+	POP	AF
+	RET				
 ;
 MD_V_SZ	.EQU	$-MD_FVERI_R		; SIZE OF RELOCATABLE CODE BUFFER REQUIRED
 ;
@@ -1141,9 +1137,9 @@ MD_FW7:	LD	A,(HL)			; FROM THE SAME FLASH ADDRESS.
 	JR	Z,MD_FWRI1
 ;
 	POP	AF			; RETURN TO ORIGINAL BANK
-	CALL	HBX_BNKSEL		; WHICH IS OUR RAM BIOS COPY
+	JP	HBX_BNKSEL		; WHICH IS OUR RAM BIOS COPY
 ;
-	RET
+;	RET
 ;
 MD_W_SZ	.EQU	$-MD_FWRIT_R		; SIZE OF RELOCATABLE CODE BUFFER REQUIRED
 ;