hexed: vram transfer + early pc transfers

[megadrive.git] / hexed / hexed.s

diff --git a/hexed/hexed.s b/hexed/hexed.s
index 418ca5c..99d1c08 100644 (file)
--- a/hexed/hexed.s
+++ b/hexed/hexed.s
@@ -275,6 +275,33 @@ 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 +1354,8 @@ 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: