INT 21 - TopWare Network OS v5.10+ - GET SPOOLER PRINTING PRIORITY
        AX = FFB0h
Return: AL = priority status (see below)
SeeAlso: AX=FFB1h

Bitfields for printer priority status:
 bit 0  LPT1 has high priority
 bit 1  LPT2 has high priority
 bit 2  LPT3 has high priority

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