INT 17,2 - Read Printer Port Status

AH = 02

DX = printer port to be used (0-2)

on return:

AH = status:

¦7¦6¦5¦4¦3¦2¦1¦0¦ Printer status bits

¦ ¦ ¦ ¦ ¦ ¦ ¦ +---- time out

¦ ¦ ¦ ¦ ¦ +------- unused

¦ ¦ ¦ ¦ +-------- I/O error

¦ ¦ ¦ +--------- selected

¦ ¦ +---------- out of paper

¦ +----------- acknowledge

+------------ not busy

- returns status of specified printer port