Update md.asm

Add some flash read / write hooks for flash

Source/HBIOS/md.asm

@@ -213,7 +213,13 @@ MD_SEEK:
 ;
 MD_READ:
 	CALL	HB_DSKREAD		; HOOK HBIOS DISK READ SUPERVISOR
-	LD	BC,MD_RDSEC		; GET ADR OF SECTOR READ FUNC
+;
+	LD	A,(IY+MD_MID)		; GET ADR OF SECTOR READ FUNC
+	LD	BC,MD_RDSECF		; 
+	CP	MID_MDFSH		; RAM / ROM = MD_RDSEC
+	JR	Z,MD_RD1		; FLASH     = MD_RDSECF
+	LD	BC,MD_RDSEC
+MD_RD1:
 	LD	(MD_RWFNADR),BC		; SAVE IT AS PENDING IO FUNC
 	JR	MD_RW			; CONTINUE TO GENERIC R/W ROUTINE
 
@@ -222,12 +228,18 @@ MD_READ:
 ;
 MD_WRITE:
 	CALL	HB_DSKWRITE		; HOOK HBIOS DISK WRITE SUPERVISOR
-	LD	BC,MD_WRSEC		; GET ADR OF SECTOR WRITE FUNC
+;
+	LD	A,(IY+MD_MID)		; GET ADR OF SECTOR WRITE FUNC
+	LD	BC,MD_WRSECF		; 
+	CP	MID_MDFSH		; RAM / ROM = MD_WRSEC
+	JR	Z,MD_WR1		; FLASH     = MD_WRSECF
+	LD	BC,MD_WRSEC
+MD_WR1:
 	LD	(MD_RWFNADR),BC		; SAVE IT AS PENDING IO FUNC
 ;	LD	A,(IY+MD_DEV)		; GET DEVICE NUMBER
 ;	OR	A			; SET FLAGS TO TEST FOR ROM (UNIT 0)
 ;	JR	NZ,MD_RW		; NOT ROM, SO OK TO WRITE, CONTINUE
-	LD	A,(IY+MD_MID	)	; IF THE DEVICES MEDIA
+	LD	A,(IY+MD_MID)		; IF THE DEVICES MEDIA
 	CP	MID_MDROM		; IS NOT ROM THEN WE CAN
 	JR	NZ,MD_RW		; WRITE TO IT
 	LD	E,0			; UNIT IS READ ONLY, ZERO SECTORS WRITTEN
@@ -269,7 +281,13 @@ MD_RW3:
 	OR	A			; SET FLAGS BASED ON RETURN CODE
 	RET				; AND RETURN, A HAS RETURN CODE
 ;
+; READ FLASH
+;
+MD_RDSECF:
+	CALL	MD_RDSEC
+	RET
 ;
+; READ RAM / ROM 
 ;
 MD_RDSEC:
 	CALL	MD_IOSETUP		; SETUP FOR MEMORY COPY
@@ -300,7 +318,13 @@ MD_RDSEC:
 	XOR	A
 	RET
 ;
+; WRITE FLASH
+;
+MD_WRSECF:
+	CALL	MD_WRSEC
+	RET
 ;
+; WRITE RAM
 ;
 MD_WRSEC:
 	CALL	MD_IOSETUP		; SETUP FOR MEMORY COPY