Update md.asm

minors

Source/HBIOS/md.asm

@@ -733,9 +733,10 @@ FF_NXT2:
 ;======================================================================
 ;
 FF_FNCALL:				; USING HBX_BUF FOR CODE AREA
-	CALL	FF_CALCA		; GET BANK AND SECTOR DATA IN IY
+	CALL	FF_CALCA		; GET BANK AND SECTOR DATA IN BC
 ;
 	POP	HL			; GET ROUTINE TO CALL
+	PUSH	BC
 ;
 	LD	DE,HBX_BUF		; EXECUTE / START ADDRESS
 	LD	BC,HBX_BUFSIZ		; MAX. CODE SIZE POSSIBLE
@@ -744,8 +745,7 @@ FF_FNCALL:				; USING HBX_BUF FOR CODE AREA
 	LD	D,B			; PRESET DE TO ZERO TO REDUCE
 	LD	E,B			; CODE SIZE IN RELOCATABLE CODE
 ;
-	PUSH	IY			; PUT BANK AND SECTOR
-	POP	BC			; DATA IN BC
+	POP	BC			; PUT BANK AND SECTOR DATA IN BC
 ;
 #IF (MD_FDBG==1)
 	CALL	PRTHEXWORD
@@ -768,15 +768,14 @@ FF_FNCALL:				; USING HBX_BUF FOR CODE AREA
 	LD	A,C			; RETURN WITH STATUS IN A
 	POP	DE
 	POP	HL
-	POP	IY
 	RET				; RETURN TO MD_READF, MD_WRITEF
 ;
 ;======================================================================
 ; CALCULATE BANK AND ADDRESS DATA FROM MEMORY ADDRESS
 ;
 ; ON ENTRY DE:HL CONTAINS 32 BIT MEMORY ADDRESS.
-; ON EXIT  I,B   CONTAINS BANK SELECT BYTE
-;          Y,C   CONTAINS HIGH BYTE OF SECTOR ADDRESS
+; ON EXIT  B     CONTAINS BANK SELECT BYTE
+;          C     CONTAINS HIGH BYTE OF SECTOR ADDRESS
 ;          A     CONTAINS CURRENT BANK HB_CURBNK
 ;
 ; DDDDDDDDEEEEEEEE HHHHHHHHLLLLLLLL
@@ -804,9 +803,6 @@ FF_CALCA:
 	RRA			; ADDRESS THAT GETS WRITTEN
 	AND	$70		; TO BANK SELECT PORT
 	LD	C,A
-;
-	PUSH	BC
-	POP	IY
 ;
 #IF (MD_FDBG==1)
 	CALL	PRTHEXWORD	; DISPLAY BANK AND
@@ -833,7 +829,6 @@ FF_CALCA:
 ;======================================================================
 ;
 MD_FIDENT:
-	PUSH	IY
 	PUSH	HL
 	PUSH	DE
 ;
@@ -905,7 +900,6 @@ MD_I_SZ	.EQU	$-MD_FIDENT_R		; SIZE OF RELOCATABLE CODE BUFFER REQUIRED
 ;======================================================================
 ;
 MD_FERAS:
-	PUSH	IY
 	PUSH	HL
 	PUSH	DE
 ;
@@ -1005,7 +999,6 @@ MD_S_SZ	.EQU	$-MD_FERAS_R		; SIZE OF RELOCATABLE CODE BUFFER REQUIRED
 ;======================================================================
 ;
 MD_FREAD:
-	PUSH	IY
 	PUSH	HL
 	PUSH	DE
 ;
@@ -1089,7 +1082,6 @@ MD_R_SZ	.EQU	$-MD_FREAD_R		; SIZE OF RELOCATABLE CODE BUFFER REQUIRED
 ;======================================================================
 ;
 MD_FWRIT:
-	PUSH	IY
 	PUSH	HL
 	PUSH	DE
 ;