From c3ef70efc08aa8a7f4e8a3c21454c554852f0432 Mon Sep 17 00:00:00 2001
From: b1ackmai1er <difficultylevelhigh@gmail.com>
Date: Thu, 6 Feb 2020 03:10:26 +0800
Subject: [PATCH] Update ppide.asm

Optimization
---
 Source/HBIOS/ppide.asm | 73 ++++++++++++++++++++++++------------------
 1 file changed, 41 insertions(+), 32 deletions(-)

diff --git a/Source/HBIOS/ppide.asm b/Source/HBIOS/ppide.asm
index b0589701..b0850329 100644
--- a/Source/HBIOS/ppide.asm
+++ b/Source/HBIOS/ppide.asm
@@ -809,30 +809,30 @@ PPIDE_GETBUF1:				; START OF READ LOOP
 ;
 #IF (PPIDE8BIT)
 	INC	C
-	INC	C
-	OUT	(C),D			; LD C,(IY+PPIDE_CTL)
-	DEC	C			; ASSERT READ
+	INC	C			; LD C,(IY+PPIDE_CTL)
+	OUT	(C),D			; ASSERT READ
+	DEC	C
 	DEC	C
-	INI
+	INI				; GET AND SAVE NEXT BYTE
 	PUSH	AF
 	INC	C
-	INC	C
-	OUT	(C),E			; LD C,(IY+PPIDE_CTL)
-	DEC	C			; DEASSERT READ
+	INC	C			; LD C,(IY+PPIDE_CTL)
+	OUT	(C),E			; DEASSERT READ
+	DEC	C
 	DEC	C
 	POP	AF
 #ELSE
-	INC	C
-	OUT	(C),D			; LD C,(IY+PPIDE_CTL)
-	DEC	C			; ASSERT READ
+	INC	C			; LD C,(IY+PPIDE_CTL)
+	OUT	(C),D			; ASSERT READ
+	DEC	C
 	DEC	C
 	INI				; GET AND SAVE NEXT BYTE
 	INC	C			; LSB -> MSB
-	INI
+	INI				; GET AND SAVE NEXT BYTE
 	PUSH	AF
-	INC	C
-	OUT	(C),E			; LD C,(IY+PPIDE_CTL)
-	DEC	C			; DEASSERT READ
+	INC	C			; LD C,(IY+PPIDE_CTL)
+	OUT	(C),E			; DEASSERT READ
+	DEC	C
 	POP	AF
 #ENDIF
 	JR	NZ,PPIDE_GETBUF1	; LOOP UNTIL DONE
@@ -851,25 +851,25 @@ PPIDE_PUTBUF:
 ;
 	; SETUP PPI TO WRITE
 
-	LD	C,(IY+PPIDE_PPI)	;;
+	LD	C,(IY+PPIDE_PPI)	
 	LD	A,PPIDE_DIR_WRITE	; SET DATA BUS DIRECTION TO WRITE
 	OUT	(C),A			; DO IT
 ;
 	; SELECT READ/WRITE IDE REGISTER
-	LD	C,(IY+PPIDE_CTL)	;;
+	DEC	C			; LD C,(IY+PPIDE_CTL)
 	LD	A,PPIDE_REG_DATA	; DATA REGISTER
-	OUT	(C),A			;;
+	OUT	(C),A			;
 
 	LD	E,A			; E := WRITE UNASSERTED
 	XOR	PPIDE_CTL_DIOW		; SWAP THE READ LINE BIT
 	LD	D,A			; D := WRITE ASSERTED
 ;
-	; LOOP SETUP
-	LD	B,0			; 256 ITERATIONS
-	LD	C,(IY+PPIDE_DATALO)	; SETUP C WITH IO PORT (LSB)
-;
-#IF (!PPIDE8BIT)
-	INC	C			; PRE-INCREMENT C
+	; LOOP SETUP			; 256 ITERATIONS
+	LD	B,0			; SETUP C WITH IO PORT (LSB)
+
+	DEC	C			; LD C,(IY+PPIDE_DATAHI)
+#IF (PPIDE8BIT)
+	DEC	C			; LD C,(IY+PPIDE_DATALO)
 #ENDIF
 ;
 	CALL	PPIDE_PUTBUF1		; FIRST PASS (FIRST 256 BYTES)
@@ -886,19 +886,28 @@ PPIDE_PUTBUF:
 	RET
 ;
 PPIDE_PUTBUF1:	; START OF READ LOOP
-#IF (!PPIDE8BIT)
+#IF (PPIDE8BIT)
+	OUTI				; PUT NEXT BYTE ON THE BUS 
+	PUSH	AF
+	INC	C			; LD C,(IY+PPIDE_CTL)
+	INC	C
+	OUT	(C),D			; ASSERT WRITE
+	OUT	(C),E			; DEASSERT WRITE
+	DEC	C
+	DEC	C
+	POP	AF
+#ELSE
 	DEC	C
 	OUTI				; PUT NEXT BYTE ON THE BUS (LSB)
 	INC	C
+	OUTI				; PUT NEXT BYTE ON THE BUS (MSB)
+	PUSH	AF
+	INC	C			; LD C,(IY+PPIDE_CTL)
+	OUT	(C),D			; ASSERT WRITE
+	OUT	(C),E			; DEASSERT WRITE
+	DEC	C
+	POP	AF
 #ENDIF
-	OUTI
-	PUSH	BC
-	LD	C,(IY+PPIDE_CTL)	; ASSERT WRITE
-	OUT	(C),D			; DO IT
-	LD	C,(IY+PPIDE_CTL)	; DEASSERT WRITE
-	OUT	(C),E			; DO IT
-	POP	BC
-;
 	JR	NZ,PPIDE_PUTBUF1	; LOOP UNTIL DONE
 	RET
 ;