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minor documentation bug fixed (#133)

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`$C05a` was incorrectly referred to as enabling VBL polling, which is actually the function of `$C05B`

> C05A=   If IOUDIS on: Disable VBL Interrupts
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Dagen Brock 2020-03-15 16:32:11 -05:00 committed by GitHub
parent f87617cb5c
commit 45cdd3bdb1
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src/fx/hw.vbl.a
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@ -68,6 +68,6 @@ UnwaitForVBL
bpl -
lda $C070 ; $c019 bit 7 is sticky, reset it
sta $C07F ; enable access to VBL register
sta $C05A ; enable VBL polling
sta $C05A ; disable VBL polling
sta $C07E ; disable access to VBL register
rts