This function is available only on the PC and on the PCjr. It is not supported on the PC/XT and all subsequent models.Writes one or more 256-byte blocks of data from memory to the cassette tape drive.
Call with:
AH = 03H
CX = number of bytes to write
ES:BX = segment:offset of buffer
Returns:
If function successful
Carry flag = clear
CX = 00H
ES:BX = segment:offset + 1 of last byte written
If function unsuccessful
Carry flag = set
AH = status
80H if invalid command
86H if cassette not present
Note:
This function is available only on the PC and on the PCjr. It is not supported on the PC/XT and all subsequent models.