X-Git-Url: https://git.sur5r.net/?a=blobdiff_plain;f=libsrc%2Fatari%2Fsiocall.s;h=da8a62656730c64d4697f557fffa5a403248ab98;hb=6657214a18d41ce76e9ea1bc8b67977ee13d3645;hp=1e6981acc681c84e2f9298c36075ac6a94e8ad01;hpb=b0e41e487dd2617c40f1290bec0e367620cd5088;p=cc65

diff --git a/libsrc/atari/siocall.s b/libsrc/atari/siocall.s
index 1e6981acc..da8a62656 100644
--- a/libsrc/atari/siocall.s
+++ b/libsrc/atari/siocall.s
@@ -6,12 +6,12 @@
 ; generic (e.g. transfer size is fixed), it's used
 ; to save space with _dio_read and _dio_write functions.
 ;
-; unsigned char __fastcall__ _sio_call(_dhandle_t handle,
-;				       _sectnum_t sect_num,
+; unsigned char __fastcall__ _sio_call(dhandle_t handle,
+;				       sectnum_t sect_num,
 ;				       void *buffer,
 ;				       unsigned int sio_val);
-; _dhandle_t - 16bit (ptr)
-; _sectnum_t - 16bit
+; dhandle_t - 16bit (ptr)
+; sectnum_t - 16bit
 ; sio_val is (sio_command | sio_direction << 8)
 ;
 
@@ -48,14 +48,26 @@
 	adc	#1
 	sta	DUNIT		; unit number (d1,d2,d3,...)
 
-	ldy	#sst_sectsize
+	lda	DAUX2		; high byte sector #
+	bne	_realsz
+	lda	DAUX1
+	cmp	#4		; sectors 1 to 3 are special (always 128 bytes)
+	bcs	_realsz
+
+	lda	#$80
+	sta	DBYTLO
+	asl	a
+	sta	DBYTHI
+	beq	_cont
+
+_realsz:ldy	#sst_sectsize
 	lda	(ptr1),y
 	sta	DBYTLO
 	iny
 	lda	(ptr1),y
 	sta	DBYTHI
 
-	lda	#DISKID		; SIO bus ID of diskette drive
+_cont:	lda	#DISKID		; SIO bus ID of diskette drive
 	sta	DDEVIC
 	lda	#15
 	sta	DTIMLO		; value got from DOS source