Instructions were represented as 30 bit words, in the following format:
f 6 bits function code j 3 bits jump condition designator k 3 bits partial word designator b 3 bits which index register to use y 15 bits operand address in memoryNumbers were represented as 30 bit words, this allowed for five 6 bit alphanumeric characters per word.
The main memory was increased to 262,144 words of core memory.
The available registers were: