I've got 2 8k CHR banks, and my header is declared as:
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.segment "INESHDR"
.byt "NES",$1A ; magic signature
.byt 2 ; PRG ROM size in 16384 byte units
.byt 2 ; CHR ROM size in 8192 byte units
.byt $31 ; mirroring type and mapper number lower nibble
.byt $00 ; mapper number upper nibble
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lda #01
sta $8000
I'll test on my powerpak later tonight, but regardless, I'd like be able to figure out what I might be doing that makes them differ.
Any guesses?