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Status value pushed to the stack has bits 4&5 incorrect in some cases #21

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Status value pushed to the stack has bits 4&5 incorrect in some cases#21
@patchandthat

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@patchandthat
patchandthat
opened on May 7, 2019
  • PHP
  • BRK
  • IRQ
  • NMI

Additionally PLP and RTI should ignore bits 4 & 5 when popping.

See https://wiki.nesdev.com/w/index.php/Status_flags#The_B_flag and https://forums.nesdev.com/viewtopic.php?f=3&t=11253

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