From bf9361b26b0f20e6c5a436f8b38ee7ab060d76f5 Mon Sep 17 00:00:00 2001
From: b1ackmai1er <difficultylevelhigh@gmail.com>
Date: Fri, 22 Oct 2021 21:45:14 +0800
Subject: [PATCH] Revert

---
 Source/HBIOS/dma.asm | 3 ---
 Source/HBIOS/md.asm  | 4 ++--
 Source/HBIOS/rf.asm  | 4 ++--
 3 files changed, 4 insertions(+), 7 deletions(-)

diff --git a/Source/HBIOS/dma.asm b/Source/HBIOS/dma.asm
index 52e0bed8..a7eaf7d6 100644
--- a/Source/HBIOS/dma.asm
+++ b/Source/HBIOS/dma.asm
@@ -165,7 +165,6 @@ DMACode_Len 	.equ	$-DMACode
 DMALDIR:
 	ld	(DMASource),hl		; populate the dma
 	ld	(DMADest),de		; register template
-	dec	bc
 	ld	(DMALength),bc
 ;
 	ld	hl,DMACopy		; program the
@@ -212,7 +211,6 @@ DMACopy_Len 	.equ	$-DMACopy
 DMAOTIR:
 	ld	(DMAOutSource),hl	; populate the dma
 	ld	(DMAOutDest),a		; register template
-	dec	bc
 	ld	(DMAOutLength),bc	
 ;
 	ld	hl,DMAOutCode		; program the
@@ -264,7 +262,6 @@ DMAOut_Len 	.equ	$-DMAOutCode
 DMAINIR:
 	ld	(DMAInDest),hl		; populate the dma
 	ld	(DMAInSource),a		; register template
-	dec	bc
 	ld	(DMAInLength),bc	
 ;
 	ld	hl,DMAInCode		; program the
diff --git a/Source/HBIOS/md.asm b/Source/HBIOS/md.asm
index 6a92d206..10e08d07 100644
--- a/Source/HBIOS/md.asm
+++ b/Source/HBIOS/md.asm
@@ -382,7 +382,7 @@ MD_SECM:
 	OR	A
 	JR	NZ,MD_NODMA
 #ENDIF
-	LD	BC,512			; COPY ONE 512B SECTOR FROM THE
+	LD	BC,512-1		; COPY ONE 512B SECTOR FROM THE
 	JP	DMALDIR			; 4K SECTOR TO THE DISK BUFFER
 #ENDIF
 MD_NODMA:
@@ -516,7 +516,7 @@ MD_SECM1:				; DESIRED SECTOR IS IN BUFFER
 	OR	A
 	JR	NZ,MD_NODMA1
 #ENDIF
-	LD	BC,512			; COPY ONE 512B SECTOR FROM THE
+	LD	BC,512-1		; COPY ONE 512B SECTOR FROM THE
 	CALL	DMALDIR			; THE DISK BUFFER TO 4K SECTOR
 	RET	NZ			; EXIT IF DMA COPY ERROR
 	JR	MD_NODMAERR
diff --git a/Source/HBIOS/rf.asm b/Source/HBIOS/rf.asm
index caf54546..47d78238 100644
--- a/Source/HBIOS/rf.asm
+++ b/Source/HBIOS/rf.asm
@@ -273,7 +273,7 @@ RF_RDSEC:
 	LD	HL,(RF_DSKBUF)		; HL := DISK BUFFER ADDRESS
 	LD	A,(RF_IO)		; GET IO PORT BASE
 #IF (DMAENABLE & (DMAMODE=DMAMODE_ECB))
-	LD	BC,512			; READ 512 BYTES
+	LD	BC,512-1		; READ 512 BYTES
 	CALL	DMAINIR			; USING DMA
 #ELSE
 	OR	RF_DAT			; OFFSET TO DAT PORT
@@ -293,7 +293,7 @@ RF_WRSEC:
 	LD	A,(RF_IO)		; GET IO PORT BASE
 	OR	RF_DAT			; OFFSET TO DAT PORT
 #IF (DMAENABLE & (DMAMODE=DMAMODE_ECB))
-	LD	BC,512			; WRITE 512 BYTES
+	LD	BC,512-1		; WRITE 512 BYTES
 	CALL	DMAOTIR			; USING DMA
 #ELSE
 	LD	C,A			; PUT IN C FOR PORT IO