Int E0  - Dr Multiuser Dos - "a_readblk" - Read String From Aux Device     [O]

   CL = ACh
   DS:DX -> character control block (CHCB) (see #3700,#3787)

Return: AX = number of characters read
Desc:  read characters from the default auxiliary (AUXn:) device into a buffer
     until the buffer is full or the device is no longer ready

Notes: if the device is initially not ready, blocks until at least one
     character has been read
   if another process owns AUX, this call blocks until the device becomes
     available
   also supported by REAL/32

See Also: INT E0/CL=03h,INT E0/CL=A5h,INT E0/CL=ADh

Format of DR Multiuser DOS character control block (CHCB):
Offset Size    Description (Table 3700)
 00h   DWORD   pointer to character buffer
 04h   WORD    length of character buffer

Note:  this version of the structure is used by REAL/32 in real mode

See Also: #3786

Format of REAL/32 protected-mode Character Control Block (CHCB):
Offset Size    Description (Table 3787)
 00h   DWORD   32-bit offset of character buffer
 04h   WORD    selector for character buffer
 06h   WORD    length of character buffer

See Also: #3700