IEC serial bytes have 8 bits, not 9. Fix logic to count 8 bits on TX
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@@ -62,7 +62,7 @@ iec_tx_byte_l1:
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;; More bits to send?
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pla
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dex
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bpl iec_tx_byte_nextbit
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bne iec_tx_byte_nextbit
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;; Done sending bits. Wait for acknowledgement
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jsr iec_assert_clk_release_data
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