From ArchaicPixels: HuC and PCEAS Documentation
Operand syntax
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A accumulator
#i immediate
#i,<n immediate and zero page | TST/SMB/RMB
#i,<n,X immediate and zero page indexed by X | TST
#i,<n,r immediate, zero page and relative | BBS/BBR
#i,n immediate and absolute | TST
#i,n,X immediate and absolute indexed by X | TST
<n zero page
<n,X zero page indexed by X
<n,Y zero page indexed by Y
<n,r zero page and relative | BBRi/BBSi
[n] indirect (*)
[n,X] indirect pre-indexed by X (*)
[n],Y indirect zero page post-indexed by Y
r relative | BRA/BSR/Bcc
n absolute
n,X absolute indexed by X
n,Y absolute indexed by Y
n,n,n source, destination, length | TAI/TIA/TII/TIN/TDD
(*) can be zero page or absolute
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