PLD specification for a 4-bit input to hexadecimal 7-segment display decoder. This is similar to functionality as a 74LS47 or 74LS48, but in addition to the numbers 0 .. 9, this device will also produce the hexadecimal numbers A .. F.
Written for the open source GAL assembler GALasm. Tested on GAL22V10 and ATF22V10 PLDs, programmed using minipro on a XGecu T48 programmer.