$B0-$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

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