HP-48S/SX/G/G+/GX

WARNING: Invoking the test described below may result in the clearing of data memory, program memory, and mode settings.The HP-48 series calculators have built-in internal, display, and keyboard test functions. These functions are accessed by pressing and holding the ON key then pressing one of the keys on the top row of the keyboard.A continuous internal/display test is performed by simultaneously pressing the ON key and the E key (the fifth key on the top row). This test will cycle through CPU, display, IROM, and IRAM tests. "OK-48" is briefly displayed before starting over. This cycling test is cancelled by simultaneously pressing the ON key and the C key (the third key on the top row).Individual tests can be performed by simultaneously pressing the ON key and the D key (the fourth key on the top row). No menu is displayed, however a vertical line is displayed down the center of the display. Most of the keys in the top five rows of the keyboard have a unique test assigned to them, however only those tests associated with the top row of keys will be discussed. Simultaneously press ON and C (the third key on the top row) to exit the individual test mode.A: SPD. This appears to be a CPU test.B: Display. This display test generates a series of test patterns. A key must be pressed to sequence through the seven test patterns.C: IROM. This test tests the internal ROM of the calculator. If the test completes successfully, "IROM OK" is displayed.D: IRAM. The internal RAM of the calculator is tested. If the test completes successfully, "IRAM OK" is displayed.E: KBD1. This test requires you to press each key from left to right, from the top row to the bottom row. The calculator beeps as each key is pressed. If a key is pressed out or order, a different beep is heard and a five-digit hexadecimal number will be displayed. Upon successful completion of the test, the message "KBD1 OK" is displayed.F: KBD2. This test appears to test the keyboard scan lines, and requires only a few keys to be pressed. The following keys, outlined in yellow in the illustration at the right, must be pressed in the following order to successfully complete this test: B, CST, Cursor-Left, yx, Backspace, Alpha, 4, 2, SPC. "KBD2 OK" displayed upon successful completion of the test.
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