To INSTAL / CHANGE the battery. Hold the card facing up and with your nail, hook the GRAY battery tray from underneath and pull it out / SEE PIC. Battery would sit in the tray facing up(positive up) /SEE PIC.
1MB BLANK RAM Card for use with HP 48SX OR 48GX Expandable Graphic Calculators. 1--Make sure the write protect switch is in NO position. 3--Insert the Ram card in PORT 2 (in port one, you will get a black screen). 4--If the calculator goes OFF, simply turn it back ON with the Ram card in it. 5--Ignore Invalid Card Data OR Low Batt (P2) Warning messages.
6--Press and hold the ON key, Press the 4th menue key (' D'), Then release both. 7--Three vertical line will appear (You might have to do step6 a few times to get the 3 vertical lines). Now press the up-arrow key. After a while (hash screen) , you will see the 1st block (128KBytes) on the screen.
1MB Plug-in RAM card offers ports 2 through 9, each containing 128 KBytes (8 x 128 kbytes)/see manual ch28. 32kB and 128kB cards can be used in either slot 1 or slot 2 of the 48SX, but larger cards should be used only in the slot 2. The item "1MB BLANK RAM Card for HP 48SX OR 48GX Graphic Calculator FRESH BATTERY FREESHIP" is in sale since Friday, September 12, 2014.This item is in the category "Business & Industrial\Office\Office Equipment\Calculators". The seller is "zizigulu" and is located in Fort Lauderdale, Florida. This item can be shipped worldwide.