X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int 15 - cassette

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INT 15 - CASSETTE - READ DATA BLOCKS (PC,Jr)
        AH = 02h
        CX = count of bytes
        ES:BX -> data area
Return: CF set on error
        AH = status
            01h CRC error
            02h bad tape signals
            04h no data
            80h invalid command
            86h no cassette present
        DX = count of bytes read
        ES:BX = pointer past last byte read

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