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Here is a site that helps with SAM4s Cash Registers and Samsung Cash Registers

The Samsung ER-650 also known as the SAM4s ER-650 is a great mid level cash register. Heavy duty with a multi-line LCD display. You won’t find an Electronic Cash Register easier to use then this one. Optional Credit Card Interface, computer interface, and kitchen printer interface.

There are a few possible drawbacks that most often can be overcome with a little planning. One big factor with this machine is that it has only one printer. In most cases it will be used as the receipt not a journal. However the register does have an electronic journal. The other drawback is that the ER-650 has only 2 serial ports. Most cases that is fine, but keep in mind if you have a credit card interface and a kitchen printer the port are gone and you could not add more options like a scale or computer interface. And the big drawback is that the ER-650 CAN NOT sharp a kitchen printer or guest checks! It you need multiple registers and one printer this machine WILL NOT work. There is an aftermarket product that can do make the 650 do this but it is expensive. If that is something you require move up to a bigger register.

Overall a great investment, just make sure you think your needs though first.

Thanks TCRG

Keyboard covers on most Sharp and Samsung (SAM4s) cash registers can be changed. They yellow after a awhile if being used any where around smoke as well as become brittle. They are easy to change yourself. The Cash Register Guys have most models available. The most popular one we sell is the cover for the Samsung (SAM4s) ER-650

We have posted for sale many different rubber cash register keyboard covers including the popular and hard to get cover for the Samsung ER-650. Sharp Cash Register Keyboard covers available as well. Just go to our home page and look for the link.

The Samsung ER-650/655 has two RS-232 ports. There is not an option to add more ports.

With, an external RS-232 switch you might be able to switch devices. The  port programming would need to be changed everytime you want to use the alternate device. As an example, a scale and scanner could be connected to the machine using both available ports. When you would like to have the machine communicate to a PC, you would switch one of the ports to the PC connection (direct or modem), then change the port programming, and the register could be polled. If this needed to be done on a daily basis it would be quite a headache. At that point I would think about a larger cash register with 3 or more ports.

You must clear memory before you use the ER-650 for the first time or after additional memory has been added.

1. Turn the power switch located on the right side of the register to the OFF position.
2. Turn the control lock to the SM position.
3. Press and hold the key position where the CHECK key is located on the default keyboard layout.
4. Continue to hold the CHECK key while turning the power switch to the ON position. The message: “RAM ALL CLEAR SERV.” displays on the screen.
5. Press the upper left key of the keyboard, then the lower left key, then the upper right key, and finally press the lower right key.
6. The display will monitor the memory clear process, which takes about 1 minute. When complete, the printer will print the message: “RAM ALL CLEAR OK !” The SERVICE MODE menu will display.