X-Git-Url: https://notaz.gp2x.de/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=hexed%2Fhexed.s;h=9a5f380508c2b1d9ca9b223be7f8b3390f87afb4;hb=3c2e737f8ed7731286b24a2a81794084e2807592;hp=418ca5c4069ab4a9a387c5e8b17c85c122bc49fb;hpb=8682b7ce22bd03b72af1ccaf65a71046e5303f73;p=megadrive.git

diff --git a/hexed/hexed.s b/hexed/hexed.s
index 418ca5c..9a5f380 100644
--- a/hexed/hexed.s
+++ b/hexed/hexed.s
@@ -203,7 +203,8 @@ sprite_data_end:
 
 predef_addrs:
 	dc.l 0x000000, 0x200000, 0x400000, 0xa00000, 0xa10000
-	dc.l 0xa11100, 0xa12000, 0xa13000, 0xa14000, 0xc00000
+	dc.l 0xa11100, 0xa12000, 0xa13000, 0xa14000, 0xa15100
+	dc.l 0xc00000
 predef_addrs_end:
 
 safe_addrs:
@@ -214,6 +215,10 @@ safe_addrs:
 	dc.l 0xa12000, 0xa120ff
 	dc.l 0xa13000, 0xa130ff
 safe_addrs_end:
+	dc.l 0xa15100, 0xa1513f
+safe_addrs_end_32x:
+	dc.l 0xa15180, 0xa153ff
+safe_addrs_end_32x_vdp:
 
 sizeof_bin:
 	dc.l _edata
@@ -275,6 +280,33 @@ main:
 	tst.w		(0xc00004).l
 no_tmss:
 
+	/* want to do early PC transfer (with RAM/VRAM intact and such)?
+	 * also give time PC to see start condition */
+	move.l		#0x2000,d0
+0:	dbra		d0,0b
+
+	move.l		#0xa10005,a0
+	btst.b		#5,(a0)
+	bne		no_early_transfer
+move.b #1,(0)
+	move.b		#0x40,(0xa1000b).l	/* port 2 ctrl */
+	move.b		#0x00,(a0)		/* port 2 data - start with TH low */
+	move.l		#0x2000,d0
+0:
+	btst.b		#4,(a0)
+	beq		do_early_transfer
+	dbra		d0,0b
+
+move.b #2,(0)
+	move.b		#0,(0xa1000b).l
+	bra		no_early_transfer	/* timeout */
+
+do_early_transfer:
+move.b #9,(0)
+	bsr		do_transfer
+
+no_early_transfer:
+
 .if COPY_TO_EXP
 	/* copy to expansion device if magic number is set */
 	move.l		#0x400000,a1
@@ -1327,7 +1359,8 @@ wait_tl_low0:
 	bne		wait_tl_low0
 
 	menu_text	txt_working, 13, 13, 0
-	bra		do_transfer
+	bsr		do_transfer
+	bra		return_to_main
 
 # go back to main mode
 return_to_main:
@@ -1374,6 +1407,19 @@ get_safety_mask:
 	lsr.l		#8,d1
 	lea		(safe_addrs,pc),a1
 	move.w		#(safe_addrs_end - safe_addrs)/8-1,d2
+	cmp.l		#0x4D415253,(0xa130ec)	/* 'MARS' */
+	bne		no_32x
+	move.w		#(safe_addrs_end_32x - safe_addrs)/8-1,d2
+	move.w		(0xa15100),d0
+	and.w		#3,d0
+	cmp.w		#3,d0			/* ADEN and nRES */
+	bne		no_32x_vdp
+	btst.b		#7,d0			/* FM */
+	bne		no_32x_vdp
+	move.w		#(safe_addrs_end_32x_vdp - safe_addrs)/8-1,d2
+no_32x_vdp:
+no_32x:
+
 0:
 	move.l		(a1)+,d0
 	cmp.l		d0,d1