The RAM makes it possible to display 256 colors selected from a possible 262,144 colors. The dual clock generators use Phase Locked Loop (PLL) technology to provide programmable frequencies for use in the graphics subsystem. The video clock contains 8 frequencies, all of which are programmable by the user. The memory clock has two programmable frequency locations. The three 8-bit DACs on the ICS5342 are capable of driving singly or doubly-terminated 75 loads to nominal 0 - 0.7 volts at pixel rates up to 135 MHz. Differential and integral linearity errors are less than 1 LSB over full temperature and VDD ranges. Monotonicity is guaranteed by design. On-chip pixel mask register allows displayed colors to be changed in a single write cycle rather than by modifying the color palette. ICS is the world leader in all aspects of frequency (clock) generation for graphics, using patented techniques to produce low jitter video timing.