Microtek ScanMaker IIG User Manual page 240

Appendix E: The Microtek MS-PNR Card...
• As mentioned before, the driver program MSPNRI.SYS -- which is located in
C:\windows\twain\scanwiz directory -- will try to assign one of the 280h,
290h, etc. addresses to your card. However, if the addresses are all in use or if
there is a conflict, you will not be able to communicate with your scanner.
In this case, remove another card such as a network card and try again. In
order to find out what address has been assigned to your MS-PNR card, run
the scanner test program and check the scanner information for the I/O port
address being used. This way, you will avoid setting another interface card's
address to this port after the PNR card is installed.
Notes on using the MS-PCZ-2 (PNR card with a jumper)
If you have the MS-PCZ-2 (the PNR card with a single jumper on it), you can
set the card to zero wait state disabled or enabled, depending on how you set the
jumper position JP1 on the card. The default is pins 1 and 2 are jumpered for
wait state disabled (see illustration below).
Some computers, however, may have trouble booting or communicating with the
scanner when the card is in this mode, and you may need to enable the zero wait
state in order to make the card communicate with your scanner. Below is a
diagram that shows how to enable or disable the zero wait state.
pin 3
JP1
Zero Wait state disabled(default)
Zero wait state disabled (default)
By placing the jumper on pins 1 & 2 (default) you are disabling the zero wait
state. By moving the jumper to position 2 & 3 you are enabling the zero wait
state.
E-2 Microtek User's Guide for Windows
pin 3
JP1
Zero wait state enabled
Zero wait state enabled