07530: dn3000, dn3500, dn5500: Resetting via typing RE crashes the emulator

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
07530	Crash/Freeze	Critical (emulator)	Always	Dec 25, 2019, 16:39	Dec 25, 2019, 19:59

Tester	PA8600	View Status	Public	Platform	MAME (Official Binary)
Assigned To	Osso	Resolution	Fixed	OS	Windows Vista/7/8 (64-bit)
Status [?]	Resolved			Driver	apollo/apollo.cpp
Version	0.217	Fixed in Version	0.218	Build	64-bit
		Fixed in Git Commit		Github Pull Request #

Summary	07530: dn3000, dn3500, dn5500: Resetting via typing RE crashes the emulator
Description	Apollo Domain emulation: typing in RE to reset the emulator crashes it. This is dumped into the console: ----------------------------------------------------- Exception at EIP=0000000000000000 (): ACCESS VIOLATION While attempting to write memory at 0000000000000000 ----------------------------------------------------- RAX=00000000048d8500 RBX=0000000000004e70 RCX=0000000000000000 RDX=0000000000000 001 RSI=000000000022926c RDI=0000000000000000 RBP=00000000002291f0 RSP=0000000000229 168 R8=000000000000ffff R9=0000000000000006 R10=00000000129b7d70 R11=0000000000000 000 R12=00000000129b7d70 R13=0000000000000001 R14=0000000000000000 R15=00000000129b7 d70 ----------------------------------------------------- Stack crawl: 0000000000229160: 0000000000000000 () 00000000002291a0: 00000000048d853b (m68000_base_device::x4e70_reset_071234fc()+0x003b) 00000000002292b0: 0000000004865efa (m68000_base_device::execute_run()+0x030a) 0000000000229330: 00000000059a4c60 (device_scheduler::timeslice()+0x02f0) 0000000000229420: 0000000005962de0 (running_machine::run(bool)+0x0130) 000000000022f0d0: 0000000003c948f8 (mame_machine_manager::execute()+0x01c8) 000000000022f3a0: 0000000003d0e593 (cli_frontend::start_execution(mame_machine_manager*, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>,std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > const&)+0x0303) 000000000022f640: 0000000003d0e9cb (cli_frontend::execute(std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >&)+0x005b) 000000000022f6a0: 0000000003c92a3c (emulator_info::start_frontend(emu_options& , osd_interface&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >&)+0x002c) 000000000022fe50: 000000000a5999e2 (main+0x0182) 000000000022ff20: 00000000004013b4 (__tmainCRTStartup+0x0234) 000000000022ff50: 000000000040150b (mainCRTStartup+0x001b) 000000000022ff80: 00000000777959cd (BaseThreadInitThunk+0x000d) 000000000022ffd0: 00000000779f385d (RtlUserThreadStart+0x001d)
Steps To Reproduce	Merely typing in RE after pressing enter to access the MD prompt will crash the emulator with an access violation in the MAME console window if launched from the command line. Typing in RE is in the mamedev wiki Apollo Domain OS install instructions and doesn't crash older versions of MAME. Emulation works fine otherwise.
Additional Information
Github Commit

Flags
Regression Version	0.216
Affected Sets / Systems	dn3000, dn3500, dn5500

Attached Files

No.17299 Tafoid Administrator Dec 25, 2019, 19:06	Broken October 25, 2019 (after cutoff for 0.215 release) Likely regression revision: https://github.com/mamedev/mame/commit/f81fbdb8d4356b7a526a902726463e2f1af00615