Vintage Hewlett Packard HP 49GX graphing calculator with 128k ram. This calculator works, but has the HP 48 button issue. All buttons work properly when you lightly press the middle of the bezel just under the display. If you do not press this spot, the buttons do not work. This is a common problem with these calculators and could be repaired. Other than that and a missing rubber foot on the back, this is in very good condition. See photos and test video. Both a keyboard and diagnostic test were performed and resulted in no issues.