Generic array logic
The Generic Array Logic device was an innovation of the PAL and was invented by Lattice Semiconductor. The GAL was an improvement on the PAL because one device type was able to take the place of many PAL device types or could even have functionality not covered by the original range of PAL devices. Its primary benefit, however, was that it was eraseable and re-programmable, making prototyping and design changes easier for engineers.
A similar device called a PEEL was introduced by the International CMOS Technology corporation.
