sps 1000 till operation?

Firstly, make sure you never use a decimal point, so for 5.50, just type 550. Secondly, you need to use an open priced product button. Some of your product buttons may be set to disallow an entry into them (they are preset with a fixed price), so if you have a miscellaneous button, try using that. If you see any buttons marked department, they are normally open.
See how you get on.

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If anyone needs more information, the Samsung/ sam4s SPS-1000 manuals are here:

http://the-checkout-tech.com/manuals/cashregisters/Samsung2.php

Registerman
March 2011