Port ram test, To run the port ram test – HP 48g Graphing Calculator User Manual
Page 448
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To exit the keyboard test
(system
halt):
1. Press and hold [ON).
2. Press and release the “C” key (the key with C next to it),
3. Release (ON). The empty stack display should appear.
Port RAM Test
The port RAM test riondestructively tests the ports (for those
calculators that have them) and the installed plug-in RAM cards.
(Plug-in RAM-card memory is preserved.)
To run the port RAM test:
1. Check that a plug-in RAM card is properly installed in port 1 or
port 2.
2. Verify that the switch on each card is set to the “Read/Write”
position.
Read-only setting
3. Turn on the calculator.
4. Press and hold [ON).
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