Manual config for testing

[coinscashout]

Im planning to buy a asic for some testing. If I buy one can the input (ie header) be configured to what i want it to be? Also, I want to get work on selected transactions only.

Is configuration possible with asic or do i have to use as is?

[coinscashout]

Any help please. How can i configure standalone asic like antminer to mine transaction criteria that i want it to?

[unholycactus]

Antminers are configurable by using a HTML page that you connect by using its IP address within your network.
Similar to how your configure your router.

You have to go with your pool's settings though.
Are you also asking about configuring a pool?