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INT 17 - NorthNet Jetstream API - INSTALLATION CHECK
        AH = F0h
        DX = printer port (0-3)
Return: AX = 0001h Jetstream present
             else  non-Jetstream port
Note:   NorthNet Jetstream is a high-performance DMA-driven parallel card able
          to drive printers at up to 80000 characters per second
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