Backtrace:

Program received signal SIGSEGV, Segmentation fault.
0x00431798 in draw_scanline8 (bitmap=0xbc81fe4, x=0, y=0, length=255,
src=0xd451811 "??bU\006?x?C\236I?\200?]?E: ?\231\\\2158?H$i)\b?\237tG?\
200\032?gs\206\n\026[\236?\032\027$s1\035o&0??W????\232???G2]Є\206\035?\234!\
a$?yk??\0047\204`6a\v\001?\205?L?,?c\034?\202\\f;\201?6", pens=0x74d1f00,
transparent_pen=15) at src/drawgfx.c:5568
5568 DECLAREG(draw_scanline, (
(gdb) bt
#0 0x00431798 in draw_scanline8 (bitmap=0xbc81fe4, x=0, y=0, length=255,
src=0xd451811 "??bU\006?x?C\236I?\200?]?E: ?\231\\\2158?H$i)\b?\237tG?\
200\032?gs\206\n\026[\236?\032\027$s1\035o&0??W????\232???G2]Є\206\035?\234!\
a$?yk??\0047\204`6a\v\001?\205?L?,?c\034?\202\\f;\201?6", pens=0x74d1f00,
transparent_pen=15) at src/drawgfx.c:5568
#1 0x00fe1429 in video_update_segae (machine=0x73f1dc0, screen=0,
bitmap=0xbc81fe4, cliprect=0x22fca0) at src/vidhrdw/segasyse.c:86
#2 0x004b9220 in video_screen_update_partial (scrnum=0, scanline=191)
at src/video.c:578
#3 0x004b9b25 in video_frame_update () at src/video.c:771
#4 0x004d287d in debug_refresh_display () at src/debug/debugcpu.c:532
#5 0x004d2d83 in mame_debug_hook () at src/debug/debugcpu.c:820
#6 0x008300b4 in z80_execute (cycles=341) at src/cpu/z80/z80.c:3575
#7 0x00421734 in cpunum_execute (cpunum=0, cycles=341) at src/cpuintrf.c:1353
#8 0x0041cc7e in cpuexec_timeslice () at src/cpuexec.c:502
#9 0x00470864 in run_game (game=2783) at src/mame.c:339
#10 0x005247c1 in utf8_main (argc=4, argv=0x40b1ff0)
at src/windows/winmain.c:152
#11 0x013fd311 in main (argc=4, a_argv=0x3fc2500) at src/windows/main.c:61 