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Function to write data in TTY mode (VioWrtTTY)

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Data:
STACK WORD VIO handle (must be 00h)
WORD length of string
DWORD pointer to character string to be written to screen
Return:
AX = error code (00h, 74h, 1B4h) (see #00373)
Notes: Write wraps at end of line and terminates if it reaches end of screen in ANSI mode, ANSI control sequences are interpreted, and this function is not required to be reentrant; in non-ANSI mode, the function is reentrant and may be called from within an MS-DOS function call.