Virtualc64: Bitfade.prg test fails

[Alessandro1970]

Bitfade test fails (it could be involved in some Emulamer code).
bitfade.prg.zip
Source: https://sourceforge.net/p/vice-emu/code/HEAD/tree/testprogs/CPU/cpuport/

VirtualC64:

ViceSC:

[Alessandro1970]

+;----------------------------------------------------------------------------
+; SHA "stable" behaviour check
+; inspired by emulamers "bad copy"
+;----------------------------------------------------------------------------
+
+basicstart = $0801
+

• 
  
  • = basicstart
  
  
• !word basicstart + $0c
• !byte $0a, $00
• !byte $9e
  +
• !byte $32, $30, $36, $32
  +
• !byte 0,0,0
  +
• 
  
  • = basicstart + $0d
    
    +
    
    +;---------------------------------------------------------
  
  

++++++++++++++++++

+;----------------------------------------------------------------------------
+; SHA "unstable" behaviour check
+; inspired by emulamers "bad copy"
+;----------------------------------------------------------------------------
+
+basicstart = $0801
+
+testpatternlen = 21 + 2
+

• 
  
  • = basicstart
  
  
• !word basicstart + $0c
• !byte $0a, $00
• !byte $9e
  +
• !byte $32, $30, $36, $32
  +
• !byte 0,0,0
  +
• 
  
  • = basicstart + $0d
    
    +
    
    +;----------------------------------------------------
  
  

https://mail.prefuse.org/p/vice-emu/mailman/vice-emu-commit/thread/From_gpz%40users.sourceforge.net_Thu_Apr_24_00%3A56%3A34_2014/

[dirkwhoffmann]

[dirkwhoffmann]

Do you remember which demo is using the processor port bitfading stuff? The badcopy demo seems to use illegal opcodes and tricky sprite collision stuff, only.

Although I have managed to get bitfade.prg to mimic VICE's output, I'm pretty sure that the implementation is not 100% accurate.

[Alessandro1970]

...not sure, maybe this:

comaland100percent.zip

[Alessandro1970]

...or this:
Noice_PseudoCode.zip

[dirkwhoffmann]

Both demos and the test case seems to work: