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Function to read char string from screen (VioReadCharStr)

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Data:
STACK WORD VIO handle (must be 00h)
WORD column at which to start reading
WORD row at which to start reading
DWORD pointer to WORD containing length of buffer in bytes on return, WORD contains number of bytes actually read
DWORD pointer to buffer for character string
Return:
AX = error code (00h, 74h, 166h ,167h, 1B4h) (see #00373)