     $B0-$B1/176-177:   Tape timing Constants

      Used by Jiffy-DOS: SPRSAV ($B0)
      Used by Jiffy-DOS: RASSAV ($B1)

       Saved, then restored by Load routine (no other usage).

      Used by Jiffy-DOS: KEYPTR

       Used only from Basic for Jiffy-DOS wedge comands, device
       toggle and function keys.

    Kernal-Reference:

     ADC $B0     : $F8E9 $F971 $F97A $F982 $FA26
     BIT $B0     : $F8F2
     DEC $B0     : $F9DB
     INC $B0     : $F9DE
     LDA $B0     : $F8E4 $F959
     STA $B0     : $F856

     ADC $B1     : $F8EC $F905
     ASL $B1     : $F8F7 $F8FA
     CMP $B1     : $F95E $F973 $F97C $F984
     LSR $B1     : $FA1F
     ROR $B1     : $F954 $F957
     SBC $B1     : $F94F $F99C $FA24
     STA $B1     : $F8EE
     STX $B1     : $F8E2 $F93A $F951