Changes
CRTC
,/* Register access */
On CRTCs 0/1/2, only the 5 least significant bits of the selected register number are considered to read a register:
* For instance, reading register 0 12 will give the same result as reading register 44 (12+32 ) or 76 (12+64).
* On CRTCs 0/2, registers 18-31 read as 0.
* On CRTC 1, registers 18-30 read as 0, register 31 reads as &FF.
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For instance, reading register 4 will give the same result as reading register 12 (4+8) or 20(4+16).
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