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Int 31 - Virus - "vacsina" Series - Installation Check (not A Vector!) [v]
Note: if one of the Vacsina viruses is resident, the low byte of this
interrupt still contains the last byte of the INT 30 CP/M JMP
instruction, but the remaining three bytes are 7Fh 39h followed
by the Vacsina version number
See Also: INT 21/AX=FFFFh"VIRUS",INT 32"VIRUS"
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