#939 Corruption when crunching with Expert cartridge.

[Modeler]

Any crunching operation ('Z' option in monitor) using any version of the Expert cartridge will cause VICE to crash, both when resuming ('R' option) or reloading the crunched image from D64. This is explain in detail here:

http://www.lemon64.com/forum/viewtopic.php?t=65416

Steps to reproduce:

• Download a CRT image of the Expert cartridge or if you prefer, enable the cartridge in PRG mode and then program in using any release of software that supports freezing to disk or tape.

• Start up VICE (I'm using 3.1) and if using a CRT image above, attach it via File > Attach cartridge image... > CRT image... (this should open the monitor)

• Type N and Enter (should zero the emulated C64's memory)

• Type a few lines of BASIC or load up a program of your choice

• Freeze the emulated C64 with a tap of the RESTORE key (Page Up on PC keyboard)

• Type Z"FILENAME" to crunch the memory (border will flash). It will try to save the program to disk (or tape if you loaded a tape-specific version of the software). If you have an attached .D64 image then it should save FILENAME.PRG to that disk but this is not necessary to demonstrate the problem.

• Type R to restart. Instead of decrunching and resuming, it will crash.

• Reloading the saved program will also crash the emulator.

All of the above appears to work fine when using a real C64 or Turbo Chameleon. It is worth noting that if I transfer the crunched program from a D64 image to a real floppy, it will also crash on a real C64 so the program is in the crunching, not the decrunching.

[gpz]

We really need some detailed tests that check the behaviour of expert cartridge...