Int 1A Fn 82  - Tandy 2500???, Tandy 1000sl/tl - Digital Sound - Record S  [s]

   AH = 82h
   ES:BX -> buffer for sound samples
   CX = length of buffer
   DX = transfer rate (1-4095, 1 is fastest)

Return: AH = 00h
   CF set if sound busy
   CF clear if sound chip free

Note:  the value in DX should be 1/10 the corresponding value for
     INT 1A/AH=83h on the 1000TL, 1/11.5 on the 1000SL.  Call
     INT 1A/AX=8100h and INT 1A/AH=84h before invoking this function.
   The BIOS issues an INT 15/AX=91FBh when the input is complete
   DMA across a 64K boundary is masked by the BIOS