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OS_ReadSysInfo 2 now reports whether the IIC bus is fast (in bit 24 of R2), and whether I/O clocks should be stopped when idling the processor (bit 25).

OS_Byte 19 is a bit more careful in its use of Portable_Idle - an edge case
where the vsync interrupt was already pending now returns immediately.

Version 5.07. Tagged as 'Kernel-5_07'

Version 4.97. Tagged as 'Kernel-4_97'

Now calls XPortable_Idle, not Portable_Idle in key-wait code.
Calls Portable_Idle in OS_Byte 19.

Version 4.94. Tagged as 'Kernel-4_94'

ObsoleteNC1CMOS (like the CMOS header file).

Version 4.71. Tagged as 'Kernel-4_71'

Version 4.68. Tagged as 'Kernel-4_68'

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'

Bandwidth limit for 7500FE fixed.
RO371Timings flag set to :LNOT:STB

Version 4.64. Tagged as 'Kernel-4_64'