The memory of the IAS consists of 1000 storage locations, called words, of40 binary digits (bits) each.2 Both data and instructions are stored there. Numbersare represented in binary form, and each instruction is a binary code. Figure 2.2illustrates these formats. Each number is represented by a sign bit and a 39-bit value.A word may also contain two 20-bit instructions, with each instruction consisting ofan 8-bit operation code (opcode) specifying the operation to be performed and a12-bit address designating one of the words in memory (numbered from 0 to 999).
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