Add the following instructions to the computer of Sec 7-3 (EA is the effective address). Write the

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Add the following instructions to the computer of Sec 7-3 (EA is the effective address). Write the symbolic microprogram for each routine as in Table 7-2. (Note that AC must not change in value unless the instruction specifies a change in AC.)
Symbol Opcode AND 0100 AC AC SUB ADM BTCL Symbolic Function AM[EA] 0101 AC ACM[EA] 0110 M[EA] M[EA] + AC ACTable 7-2

Label ADD: BRANCH: OVER: STORE: EXCHANGE: FETCH: TABLE 7-2 Symbolic Microprogram (Partial) Microoperations CD

7-3 Microprogram Example Once the configuration of a computer and its microprogrammed control unit is

111 10 10 SBR MUX AR PC 0 CAR Control memory 128 x 20 Control unit Address 15 15 Memory 2048 x 16 MUX DR


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Computer System Architecture

ISBN: 9780131755635

3rd Edition

Authors: M. Morris Mano

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