dssboot: +fixed bug with one cluster FAT32 rootdir search

BOOT/DSSBOOT.ASM

@@ -683,6 +683,8 @@ GET_BPB:	XOR	A
 .mirrored_FATs:	;
 		LD	HL,(BOOT_BUFFER + BOOT_SECTOR.RootDirStartCluster)
 		LD	DE,(BOOT_BUFFER + BOOT_SECTOR.RootDirStartCluster+2)
+		LD	(FatBuffer.RootDirStartCluster_L),HL
+		LD	(FatBuffer.RootDirStartCluster_H),DE
 		CALL	CLUSTER_TO_SECTOR.no_prepare
 		LD	(FatBuffer.RootDirFirstSector_L),IX
 		LD	(FatBuffer.RootDirFirstSector_H),HL
@@ -739,21 +741,49 @@ CLUSTER_TO_SECTOR:
 
 
 ; ¯®¨áª system.dos
-GETROOT:	LD	HL,(FatBuffer.RootDirFirstSector_H)
+GETROOT:	LD	HL,(FatBuffer.RootDirStartCluster_L)
-		LD	IX,(FatBuffer.RootDirFirstSector_L)
+		PUSH	HL
-		LD	BC,(PARTITION_START_L)
+		LD	HL,(FatBuffer.RootDirStartCluster_H)
-		LD	DE,(PARTITION_START_H)
+		PUSH	HL
-		; [x] 28/04/2024. Bug with incorrect reading root dir. Reported by Roman "Romychs" Boykov.
-		 ADD	IX,BC
-		 ADC	HL,DE
-		;	
 		LD	A,(FatBuffer.FAT_TYPE)
 		CP	FAT_TYPE.x32
 		LD	A,(FatBuffer.DirSizeInSectors)
-		JR	NZ,.NEXTSEC
+		JR	NZ,.load_and_search
 		;
 		LD	A,(FatBuffer.SectorsPerCluster);!FIXIT ¯à®çâñâ ⮫쪮 ¯¥à¢ë© ª« áâ¥à ª â «®£  ­  FAT32
-.NEXTSEC:	PUSH	AF
+.load_and_search:
+		LD	HL,(FatBuffer.RootDirFirstSector_H)
+		LD	IX,(FatBuffer.RootDirFirstSector_L)
+		;LD	BC,(PARTITION_START_L)
+		;LD	DE,(PARTITION_START_H)
+		; [x] 28/04/2024. Bug with incorrect reading root dir. Reported by Roman "Romychs" Boykov.
+		 ;ADD	IX,BC
+		 ;ADC	HL,DE
+		;
+.NEXT_CLUSTER:	CALL	GET_ABSOLUTE_SECTOR
+		CALL	.NEXT_SECTOR
+		;
+		POP	HL
+		EXX
+		POP	HL
+		RET	C
+		RET	NZ
+		CALL	READ_FROM_FAT
+		RET	C
+		EX	DE,HL
+		PUSH	HL
+		EXX
+		 EX	DE,HL
+		 PUSH	HL
+		EXX
+		; in:	HL':HL - CLUSTER
+		; out:	HL:IX  - SECTOR
+		CALL	CLUSTER_TO_SECTOR
+		LD	A,(FatBuffer.SectorsPerCluster)
+		JR	.NEXT_CLUSTER
+		;
+		;
+.NEXT_SECTOR:	PUSH	AF
 		; [x] 28/04/2024. Bug with incorrect reading root dir. Reported by Roman "Romychs" Boykov.
 		 ;ADD	IX,BC
 		 ;ADC	HL,DE
@@ -779,10 +809,22 @@ GETROOT:	LD	HL,(FatBuffer.RootDirFirstSector_H)
 		 DEC	HL
 		;
 		DEC	A
-		JR	NZ,.NEXTSEC
+		JR	NZ,.NEXT_SECTOR
-		SCF
+		RET
+		;
+;	;	;
+
+; ¢å®¤:  HL:IX - ®â­®á¨â¥«ì­ë© ᥪâ®à
+; ¢ë室: HL:IX -  ¡á®«îâ­ë© ᥪâ®à
+GET_ABSOLUTE_SECTOR:
+		LD	DE,(PARTITION_START_L)
+		ADD	IX,DE
+		LD	DE,(PARTITION_START_H)
+		ADC	HL,DE
 		RET
 ;
+
+
 SEARCH:		LD	C,17		;HANDELS PER SECTOR  512/32 + 1
 		LD	IX, DIR_BUFFER - FAT_DIRECTORY_RECORD
 .SKIPNAM:	LD	DE,FAT_DIRECTORY_RECORD
@@ -839,10 +881,11 @@ LOAD_CORE:	LD	(READMEM),DE
 		; CP	FAT_TYPE.x32
 		; JR	NZ,.skip_it
 		;
-	LD	DE,(PARTITION_START_L)
+		;LD	DE,(PARTITION_START_L)
-	ADD	IX,DE
+		;ADD	IX,DE
-	LD	DE,(PARTITION_START_H)
+		;LD	DE,(PARTITION_START_H)
-	ADC	HL,DE
+		;ADC	HL,DE
+		CALL	GET_ABSOLUTE_SECTOR
 ;.skip_it:	;
 		LD	DE,(READMEM)
 		LD	A,(BOOT_BUFFER + BOOT_SECTOR.SectorsPerCluster)
@@ -881,7 +924,6 @@ LOAD_CORE:	LD	(READMEM),DE
 		CCF
 		RET	NC
 		; [ ] § £à㧪  system.dos ¡®«ìè¥ #4000 ¡ ©â®¢
-
 .BIG_CORE+1:	 LD	A,0
 		 DEC	A
 		 LD	(.BIG_CORE),A
@@ -1049,10 +1091,12 @@ READ_FAT_TABLE:	PUSH	HL
 .no_inc:	ADC	HL,BC
 		; HL:IX - SECTOR FAT FOR READING
 		;
-		LD	DE,(PARTITION_START_L)
+		;LD	DE,(PARTITION_START_L)
-		ADD	IX,DE
+		;ADD	IX,DE
-		LD	DE,(PARTITION_START_H)
+		;LD	DE,(PARTITION_START_H)
-		ADC	HL,DE
+		;ADC	HL,DE
+		CALL	GET_ABSOLUTE_SECTOR
+		;
 		LD	DE,FAT_SECTORS_BUFFER
 		;
 		IN	A,(SLOT3)

BOOT/boot.asm

@@ -26,8 +26,8 @@
 .CacheBlock:			WORD	#0000
 ;.CacheUpdated:			BYTE	#00
 ;.SectorsPerBank:		BYTE	#00
-;.RootDirStartCluster_L:	WORD	#0000
+.RootDirStartCluster_L:		WORD	#0000
-;.RootDirStartCluster_H:	WORD	#0000		; fat32
+.RootDirStartCluster_H:		WORD	#0000		; fat32
 .FAT1_SEC_L:			WORD	#0000		; MSD_FAT_SEC first sector FAT (FAT_FRM)
 .FAT1_SEC_H:			WORD	#0000		; fat32
 ;.FAT2_SEC_L:			WORD	#0000