Casio te8500f I recently bought this machine from a sale. can anyone tell me how to get it working? when i turn it on, it displays some copyright screen with the letters FC at the bottom left corner. It doesn't go beyond that Also can i connect this machine to a PC?

This machine is too cheap to have a void function so you will need to finish the sale with cash. Now you can reverse the transaction:
Turn the key to RF mode. Enter the items exactly as you did the first time. they will all be negative items now and they will go back out of the daily sales. Finish the sale with the same payment type (cash) and the machine will take the amount back out of the cash total. Now your sales report will have the correct figures.

If you want an easier method, buy a Casio with the CANCEL function and you can quit a sale at any time :)

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If anyone needs a Casio PCR-T280 manual, one of the users has it here:
http://the-checkout-tech.com/manuals/cashregisters/Casio_PCR-T280_operating_and_programming_manual.html

Turn key to PROGRAM mode. Turn power off at wall. Hold RECEIPT FEED down - keep your finger on it. Turn power on at wall. Wait 5 seconds, then let go of RECEIPT FEED. You should see "FFFFFFFFFF" on display. Press SUBTOTAL.
That will jump the machine out of the sale.
Now, while still in program mode, 3 SUBTOTAL (display should show P3) 0 Now press an item with condiment problem. If you have a few items with this problem, press 0 before each item. SUBTOTAL
Now turn back to REG and try them in a sale. If they work, you can go back to programming them correctly.
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If anyone needs more information, the TK2700 programming manual is here: http://the-checkout-tech.com/manuals/cashregisters/Casio_TK-2300_and_TK-2700_and_CE-4700_programming_manual.html

Highlight "flag clear" and press YES button. If it still does not work, you have a flat or (usually) faulty memory battery and it will need to be RAM cleared then re-programmed.
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If anyone needs more informaton on the Casio TE-8000f or TE-8500f, the manuals are here:
Programming manual: http://the-checkout-tech.com/manuals/cashregisters/Casio_TE-7000S_and_TE-8000F_and_TE-8500F_programming_manual.html
Service (repair) manual: http://the-checkout-tech.com/manuals/cashregisters/Casio_TE-7000S_and_TE-8000F_and_TE-8500F_service_version_2_manual.html

Ok. See if you can get rid of the buffer full error for a start. try pressing clear (C) then press Subtotal. You should see an amount on the display. Now press the ERR CORR/ CANCEL button. This should stop the sale that you are stuck in.
Turn the key to Program mode. If it gives error as you turn the key, then you haven't finshed in REG, turn back to REG and try to end the sale first.
If you see P01 on the display, it has worked and then do this:
1 SUBTOTAL 0 CASH SUBTOTAL 3 SUBTOTAL 0 CASH SUBTOTAL.
Now turn back to REG and try it.
If it still didn't work, let me know what happened, and I'll show you another method
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If anyone needs a Casio TE-4000F manual, try here: http://the-checkout-tech.com/manuals/cashregisters/Casio_TE-3000S_and_TE-4000F_and_TE-4500F_dealers_manual.html

Hi. The -2- refers to the PLU level. It means that someone has turned the menu sheet holder over to side 2. Have a look at the number on the plastic frame that holds the rubber cover. If it is 2, turn the holder over to side 1 and the number should go away from the display. While on side 2, the items are completely different from side 1 (this is used for multiple menus e.g lunch and dinner menus).
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If anyone needs a Casio TE-4000F manual, try here: http://the-checkout-tech.com/manuals/cashregisters/Casio_TE-3000S_and_TE-4000F_and_TE-4500F_dealers_manual.html

PGMX means the machine is trying to print a current program report. It may have been interrupted. Try this procedure to jump it back out:
Turn key to PROGRAM mode. Turn power off at wall. Hold RECEIPT FEED down - keep your finger on it. Turn power on at wall. Wait 5 seconds, then let go of RECEIPT FEED. You should see "FFFFFFFFFF" on display. Press SUBTOTAL. Turn key back to REG mode (you may need to sign on if asked)
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If anyone needs a manual for a Casio TE-4000F cash register, http://the-checkout-tech.com/manuals/cashregisters/Casio4.php

Try this: Turn key to program mode 0 CASH SUBTOTAL 3 SUBTOTAL 0 CASH SUBTOTAL
This should remove the preset amount from the CASH button. Now it should work normally when finishing the sale.
Now turn back to REG mode when entering the price, DO NOT use a decimal, so type 2000 for 20 dollars. Now press a PLU (item) button. SUBTOTAL Type the amount received (NO DECIMAL, so 5000 for 50 dollars) Press CASH Change should be displayed, and drawer open
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If anyone needs a manual for a Casio TE-2400 cash register, go here:
http://the-checkout-tech.com/manuals/cashregisters/Casio4.php

Hi. Turn power off on bottom of machine. Hold down the top right button on the keyboard. It doesn't matter which product is programmed there, it must be the top right button. Turn on at bottom. When you see the copyright message, let go of button and press the right part of the subtotal button. when it asks to flag clear, press Yes

You may have lost everything from the machine. Try this first:
Turn key to PROGRAM mode. Turn power off at wall. Hold RECEIPT FEED down - keep your finger on it. Turn power on at wall. Wait 5 seconds, then let go of RECEIPT FEED. You should see "FFFFFFFFFF" on display. Press SUBTOTAL.
Turn key back to REG mode and try it (you might have to log on if you get Error 8 - clerk buttons next to key or logon code)
If it doesn't work, look at the print out on the receipt and tell me what the big number is right at the bottom under the copyright message.

Remove the wall plug and the batteries at the same time, wait ten minutes, put the batteries back first and then plug it back in and turn the key to Reg, you should see a row of zeros across the display as the machine resets itself.
If this doesn't happen the machine is dead and that is very unusual for a Casio.