This function is available only on the PC and on the PCjr. It is not supported on the PC/XT and all subsequent models.Reads one or more 256-byte blocks of data from the cassette tape drive to memory.
Call with:
AH = 02H
CX = number of bytes to read
ES:BX = segment:offset of buffer
Returns:
If function successful
Carry flag = clear
DX = number of bytes actually read
ES:BX = segment:offset + 1 of last byte read
If function unsuccessful
Carry flag = set
AH = status
01H if CRC error
02H if bit signals scrambled
04H if no data found
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.