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

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patchandthat opened this issue May 7, 2019 · 0 comments
Open

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

patchandthat opened this issue May 7, 2019 · 0 comments

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@patchandthat
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patchandthat commented May 7, 2019 •
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  • 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
@patchandthat patchandthat changed the title Value pushed to the stack has bits 4&5 incorrect in some cases Status value pushed to the stack has bits 4&5 incorrect in some cases May 8, 2019
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