[FW_OTHELL] Othello - crash using then N option key

[ftoledo]

Module Information

• Identifier [FW_OTHELL]
• Module Name [Farwest Othello Demo]
• Version [5.13]

On actual board game , press N key and got MBBSemu crash

Software Information:

• OS: [Debian GNU Linux]
• Telnet Client [Syncterm]
• MBBSEmu build from git wtih dotnet-sdk 5.0.402

  
  2021-10-24 23:14:51.3004 Debug MBBSEmu.HostProcess.ExportedModules.Majorbbs.setmbk (FW_OTHEL) Enqueue Previous MCV File: FW_OTHEL.MCV (Pointer: FFFF:0001)
  2021-10-24 23:14:51.3004 Debug MBBSEmu.HostProcess.ExportedModules.Majorbbs.setmbk (FW_OTHEL) Set Current MCV File: FW_OTHEL.MCV (Pointer: FFFF:0001)
  2021-10-24 23:14:51.3004 Debug MBBSEmu.HostProcess.ExportedModules.Majorbbs.strlen (FW_OTHEL) Evaluated string length of 8 for string at 0000:FFCA
  2021-10-24 23:14:51.3004 Debug MBBSEmu.HostProcess.ExportedModules.Majorbbs.strlen (FW_OTHEL) Evaluated string length of 8 for string at 0000:FFCA
  2021-10-24 23:14:51.3004 Debug MBBSEmu.HostProcess.ExportedModules.Majorbbs.setmbk (FW_OTHEL) Enqueue Previous MCV File: FW_OTHEL.MCV (Pointer: FFFF:0001)
  2021-10-24 23:14:51.3004 Debug MBBSEmu.HostProcess.ExportedModules.Majorbbs.setmbk (FW_OTHEL) Set Current MCV File: FW_OTHEL.MCV (Pointer: FFFF:0001)
  2021-10-24 23:14:51.3004 Debug MBBSEmu.HostProcess.ExportedModules.Majorbbs.strlen (FW_OTHEL) Evaluated string length of 1 for string at 1000:400E
  2021-10-24 23:14:51.3013 Debug MBBSEmu.HostProcess.ExportedModules.Majorbbs.setbtv (FW_OTHEL) Setting current Btrieve file to FW_OTGAM.DAT (1000:C98E)
  2021-10-24 23:14:51.3013 Debug MBBSEmu.HostProcess.ExportedModules.Majorbbs.setbtv (FW_OTHEL) Setting current Btrieve file to FW_OTGAM.DAT (1000:C98E)
  Unhandled exception. System.ArgumentOutOfRangeException: Specified argument was out of the range of valid values. (Parameter 'Unsupported OpCode: Cdq')
  at MBBSEmu.CPU.CpuCore.Tick()
  at MBBSEmu.HostProcess.ExecutionUnits.ExecutionUnit.Execute(FarPtr entryPoint, UInt16 channelNumber, Boolean simulateCallFar, Boolean bypassState, Queue`1 initialStackValues, UInt16 initialStackPointer)
  at MBBSEmu.Module.MbbsModule.Execute(FarPtr entryPoint, UInt16 channelNumber, Boolean simulateCallFar, Boolean bypassSetState, Queue`1 initialStackValues, UInt16 initialStackPointer)
  at MBBSEmu.HostProcess.MbbsHost.Run(String moduleName, FarPtr routine, UInt16 channelNumber, Boolean simulateCallFar, Queue`1 initialStackValues)
  at MBBSEmu.HostProcess.MbbsHost.WorkerThread()
  at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
  at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
  --- End of stack trace from previous location ---
  at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
  at System.Threading.ThreadHelper.ThreadStart()
  Abortado

[enusbaum]

Missing OpCode that needs to be added to CpuCore.cs, looks similar to CWD:

Link to CWD implementation: https://github.com/mbbsemu/MBBSEmu/blob/master/MBBSEmu/CPU/CPUCore.cs#L1329

[ftoledo]

wow! I don't have low level skills programming, i found your project very amazing! it makes me really want to learn! if you need some another test or more debug, please let me know. thanks!

[enusbaum]

Thank you @ftoledo! We've actually tried to structure the project to be as friendly as we can make it for new comers. A bunch of our PR's are from folks who are learning C# for the first time on MBBSEmu 😄

If you want to learn how to contribute or have any questions, feel free to join the project Discord. There's a bunch of folks there who can help you out! 🍻