OS_Byte 129 0 255 now reports &A7 for STB build (because it _is_ a
RISC OS 3.7 generation kernel). CMOS no longer gets scrambled when reset in STB build. UpCall_KeyboardStatus now issued when OS_Byte 202 called or when keyboard status byte is changed by other means (such as pressing Caps Lock). Version 4.67. Tagged as 'Kernel-4_67'
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