Peripheral 3 Setting Register

Number	TBRegisterNumber::$08
Readable	TBRegisterReadable::Yes
Writable	TBRegisterWritable::Yes
Short Description	[[ShortDesc::Enables Stereo, Internal Speaker, SpecDrum, Timex Video Modes, Turbo Sound Next and NTSC/PAL selection.]]

 (R/W) 0x08 (08) => Peripheral 3 setting:
 bit 7 = 128K paging enable (inverse of port 0x7ffd, bit 5) 
         Unlike the paging lock in port 0x7ffd, 
         this may be enabled or disabled at any time.
         Use "1" to disable the locked paging.
 bit 6 = "1" to disable RAM contention. (0 after a reset) 
 bit 5 = Stereo mode (0 = ABC, 1 = ACB)(0 after a PoR or Hard-reset)
 bit 4 = Enable internal speaker (1 = enabled)(1 after a PoR or Hard-reset)
 bit 3 = Enable Specdrum/Covox (1 = enabled)(0 after a PoR or Hard-reset)
 bit 2 = Enable Timex modes (1 = enabled)(0 after a PoR or Hard-reset)
 bit 1 = Enable TurboSound (1 = enabled)(0 after a PoR or Hard-reset)
 bit 0 = Reserved, must be 0

https://www.specnext.com/tbblue-io-port-system/