Several popular graphing calculators from Texas Instruments, including the TI-83 and TI-84, have a display resolution of 96*64, but only 95*63 pixels are used for graphing.
However, the earlier TI-81 did use all 96*64 pixels. The rationale for this change was to establish a central row and column for the axes and a central pixel for the origin. The cursor could only move pixel-by-pixel, and since the axes and origin would end up “between” pixels on the TI-81, they were inaccessible by the cursor.
Several popular graphing calculators from Texas Instruments, including the TI-83 and TI-84, have a display resolution of 96*64, but only 95*63 pixels are used for graphing.
However, the earlier TI-81 did use all 96*64 pixels. The rationale for this change was to establish a central row and column for the axes and a central pixel for the origin. The cursor could only move pixel-by-pixel, and since the axes and origin would end up “between” pixels on the TI-81, they were inaccessible by the cursor.