$BE/190:   Tape Input/Output Block count

  Used by Jiffy-DOS: DRVBYT

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

Kernal-Reference:

 DEC $BE     : $FC57
 LDA $BE     : $FA6A $FC84
 LDX $BE     : $FA7A $FB55 $FC24
 STA $BE     : $F8A6 $FB64
 STX $BE     : $FB5A

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