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Cannot write into Control register on windows 7 64bit platform

Posted: Sat Mar 02, 2019 11:19 am
by zhimakaimen
I compiled the source code ( InpOut32 ) provided on this web site, when I run it, I found I can only write / read Data register(0x378), the control register's(0x37A) value seems always be 63 on windows 7 64bit (on both of 2 different machines). When I switched to windows 7 32bit on one of these 2 machines(I will test the other machine next monday), I can change the low 6 bits of Control register, and the highest 2 bits are always 11.

Any clues are welcomed, thanks in advance.