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On CRTCs 0/1/2, if a Write Only register is read from, "0" is returned. The register accessing scheme on CRTCs 3/4 makes it impossible to happen.
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=== Register access ===
On CRTCs 0/1/2, if a Write Only register is read from, "0" is returned. The register accessing scheme on CRTCs 3/4 makes it impossible to happen.
On all CRTCs, only the 5 least significant bits of the selected register number are considered to write to a register. The other bits are ignored.