Earliest data output time considering TACC in 8085 Microprocessor

27128 receives the Address A_13-8 by 27128 from 8085AH by means of the octal line driver 74LS244, which has a propagation delay of 12 nS. Address ranging from A_7-0 is received by 27128 from 8085AH by means of 74LS373 octal latch, which consists of a propagation delay of 30 nS. Thus, address ranging from A_13-0 is received by 27128 at the end of 30 nS. So the data only comes out on D_7-0 pins of 27128 by 30 nS + t_Acc = 30 nS + 200 nS = 230 nS.

  Delays involved in accessing 27128 EPROM in ALS kit.

 Bus timing characteristics of MR machine cycle