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Microsequencer
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=== Functional branch format === When the CB field contains 15, a ''functional branch'' occurs. The bits of the new microstore address in the ROAR are determined as follows. * bits 11–10: CD field * bits 9–6: CA field * bit 5: always 0 * bits 4–1: high-order 4 bits of the Q register, which is the right input to the 8-bit ALU * bit 0: result of the test specified by the CC field The CC field can specify various tests of the state of the machine. It can also specify a constant 0 or 1 for an unconditional bit. This format alters the flow of control to 1 of 16 instruction ''pairs'' within the low 32 words of a 64-word block of microstore (because bit 5 is always 0). The CC field then determines which instruction of the pair receives control.
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