08925: mt65: Crash when trying to load a tape

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
08925	Crash/Freeze	Critical (emulation)	Always	Sep 27, 2024, 09:04	Oct 18, 2024, 17:57

Tester	Robbbert	View Status	Public	Platform	MAME (Self-compiled)
Assigned To	Pernod	Resolution	Fixed	OS	Windows 10/11 (64-bit)
Status [?]	Resolved			Driver	tangerine/microtan.cpp
Version	0.270	Fixed in Version	0.271	Build	64-bit
		Fixed in Git Commit	c117e94	Github Pull Request #

Summary	08925: mt65: Crash when trying to load a tape
Description	When loading a tape with XBUG installed, it crashes as soon as LOAD is entered.
Steps To Reproduce	Type this at the command line, substituting your own tape filename. >mame mt65 xbug -cass e:\data\tangerine\microtan\fast.wav Once it starts up, type BAS to enter Basic. Then type LOAD to load the tape. At soon as enter is pressed, MAME crashes.
Additional Information	C:\MAME>mame mt65 xbug -cass e:\data\tangerine\microtan\fast.wav ----------------------------------------------------- Exception at EIP=00007ff699b2fcb4 (non-virtual thunk to generic_rom_linear_device::read_rom(unsigned int)+0x0004): INTEGER DIVIDE BY ZERO ----------------------------------------------------- RAX=00000000000007f7 RBX=0000021ab3a03328 RCX=0000021ab0ebd9c0 RDX=0000000000000000 RSI=0000021ab0ed8570 RDI=000000000000f7f7 RBP=0000021ab3a03338 RSP=000000edce0f9538 R8=00007ff6968ad690 R9=0000000000000000 R10=00000000000037f7 R11=0000021ab0fa7458 R12=00007ff699598ab0 R13=00000000ffffffff R14=00007ff699598ad0 R15=000000edce0f99f0 ----------------------------------------------------- Stack crawl: 000000edce0f9530: 00007ff699b2fcb4 (non-virtual thunk to generic_rom_linear_device::read_rom(unsigned int)+0x0004) 000000edce0f95a0: 00007ff6995981ed (tanbus_device::read(unsigned int)+0x00ed) 000000edce0f9600: 00007ff696951ffe (m6502_device::jmp_adr_full()+0x01ae) 000000edce0f9640: 00007ff69692f82a (m6502_device::execute_run()+0x009a) 000000edce0f96b0: 00007ff6968791ec (device_scheduler::timeslice()+0x048c) 000000edce0f9830: 00007ff6968760f5 (running_machine::run(bool)+0x01c5) 000000edce0fee50: 00007ff699962d0c (mame_machine_manager::execute()+0x024c) 000000edce0ff240: 00007ff69d62695a (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&)+0x03ea) 000000edce0ff550: 00007ff69d626f8a (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> > > >&)+0x007a) 000000edce0ff5b0: 00007ff69995dab7 (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> > > >&)+0x0027) 000000edce0ff980: 00007ff69f2acd51 (luaopen_lfs+0xc59e01) 000000edce0ff9d0: 00007ff692b612ee (__tmainCRTStartup+0x016e) 000000edce0ffa00: 00007ff692b61406 (mainCRTStartup+0x0016) 000000edce0ffa30: 00007ffcf3697374 (BaseThreadInitThunk+0x0014) 000000edce0ffab0: 00007ffcf527cc91 (RtlUserThreadStart+0x0021)
Github Commit

Flags
Regression Version
Affected Sets / Systems	mt65

Attached Files

No.22345 Robbbert Senior Tester Sep 27, 2024, 09:07	At one time this system could load tapes without needing anything special, but it's been considerably refactored since then, and tapes can no longer be loaded.
No.22356 Robbbert Senior Tester Oct 4, 2024, 08:55	Confirmed since once again, nobody could be bothered.
No.22372 Pernod Developer Oct 14, 2024, 20:59	This bug report is quite misleading as the issue is caused by trying to access the XBUG ROM and has nothing to do with trying to load a tape.
No.22373 Robbbert Senior Tester Oct 15, 2024, 09:22	Well sorry about that, but the crash happened when I tried to load a tape. I'm not really sure how else I could have described it. Although the crash is now fixed, I'm still having the greatest difficulty in getting anything to run on this system. (ROM and SNAP from swlist are ok). For example, the mt65_cass software list gives no clue on how one could load and run the tape. The loose files in my collection are almost all non-working.
No.22376 Pernod Developer Oct 15, 2024, 10:32	I agree that the loading instructions could be improved, but can assure you that all mt65_cass items do work. It's not obvious if you're not familiar with the machine or software. BASIC programs, with extension .B, are the easiest, enter BASIC with BAS then LOAD. You have to specify the filename and most will require you to enter Y when asked FAST. For anything with a .A extension you'll need to know where to execute it when loaded, usually G400. Feel free to ping me on Discord for instructions on individual files.