Ias instruction format !951!

organization of the cpu and main memory of the ias computer
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Table 2.1 The IAS Instruction Set. Instruction Type. Opcode. Symbolic. Representation. Description. 00001010 LOAD MQ. Transfer contents of register MQ to the. Instruction Set Architecture. Consider x := y+z. (x, y, z are memory variables). 1-address instructions. 2-address instructions. LOAD y (r :=y). ADD y,z (y := y+z). Simplified IAS language Assembly language instructions often pass through Level 3 without Also known as the Instruction Set Architecture (ISA) Level. IAS Instruction Format Each memory location is capable of storing two 20 bit instructions. If M(X) denotes the 40-bit memory word with address X, then M(X, 0:19) Sep 18, 2002 The IAS computer has 4096 40-bits words of memory. The machine has The following table describes the IAS instruction set. In the table X The IAS machine was a binary computer with a 40-bit word, storing two 20-bit instructions in each word. The memory was 1,024 words (5.1 kilobytes). Negative numbers were represented in "two's complement" format. It had two general-purpose registers available: the Accumulator (AC) and Multiplier/Quotient (MQ). Table 2.1 The IAS Instruction Set. Instruction Type. Opcode. Symbolic. Representation. Description. Data transfer. 00001010 LOAD MQ. Transfer contents of instructions that are recognized by a CPU. Representations: • Machine code (Binary/Hex). • Assembly code (Mnemonics). Example (IAS – see ch.2):. 00000101 memory organization. 0 address space -- how may locations can be addressed? 0 addressibility -- how many bits per location? – register set (a place to store a