Viewing Issue Advanced Details
|ID||Category [?]||Severity [?]||Reproducibility||Date Submitted||Last Update|
|05985||Crash/Freeze||Critical (emulator)||Always||Jul 11, 2015, 10:45||Apr 20, 2018, 06:16|
|Version||0.163||Fixed in Version||Build|
|Summary||05985: Z80 CPU core can't handle many IX/IY (0xdd/0xfd) instruction prefixes in a row|
code in provided example software do follwing -
fills big RAM area with 0xFD and jump there
as result I see in error log a lot of "Z80 ':maincpu' ill. opcode $fd $fd" messages and then emulator exits, silently, without printing any callstack messages.
I think stack overflow happens.
|Steps To Reproduce||
- unpack provided floppy image to MAME folder
- run "mame pentagon -flop1 fuckemul.trd"
- select TR-DOS (cursor up, enter)
- RUN (r, enter)
shortly emulator silently closes for me, other user reported appcrash message
|Affected Sets / Systems|
fuckemul.zip (1,710 bytes) Jul 11, 2015, 10:45 Uploaded by MetalliC
|There are no relationsihp linked to this issue.|
Jul 11, 2015, 17:56
edited on: Jul 11, 2015, 17:59
Do we have any confirmed way to run this on real hardware and have it be something that we can actually see operate correctly - are there any visual clues built into the program that will let us know it works or doesn't other than exception crashing?
That said, I do get an exception, but no stack:
Exception at EIP=0000000002CC2966 (z80_device::illegal_1()+0x00a6): STACK OVERFLOW
Apr 10, 2018, 06:56
edited on: Apr 10, 2018, 07:00
This doesn't seem to be an issue any more.
No crash for me.
Also, I tried in super80m setting 32k of ram to FD and running it - no crash.
To test in super80m start it and do the following steps: (press enter at the end of each line)
F 0 7FFF FD
(this gives a new prompt) type in C3 4 C0 then a period.
You'll get a prompt on a new line, indicating success.
Apr 18, 2018, 04:30
No response, so let's close it.
Don't know who fixed it, or when.
Apr 18, 2018, 19:44
|Please do not assign current GIT as the "fixed" when you are not sure when something is fixed, just leave blank and resolve.|
Apr 19, 2018, 23:22
I don't think this bug was fixed! I still get the error messages
[:maincpu] Z80 ill. opcode $fd $fd...
Using mame pentagon -flop1 fuckemul.trd -log
Apr 20, 2018, 06:16
|The bug report was because it caused an unexpected exit, which has been fixed. The log message can be ignored.|