Consider a system with demand-paged memory, without which the average time to deal with a fault page size is X when there is an empty frame or the page to be replaced has not been modified, and 2X if the page to be replaced has been modified. The system has a TLB (associative memory) to accelerate the translation process. The average access time to the TLB is 10 nanoseconds and the memory is 50nanoseconds. On average, 20% of the requisitions available an empty frame and 60% demand the replacement of pages that have not been modified. The success rate of consultations with the TLB is 70% and 1% Capture memory access generates page faults. What should be the value of X for the timeaverage effective access to memory does not exceed 10 ms?

Write a new lc-3 trap subroutine (i.e. a subroutine that will be invoked via the trap instruction) that will receive a numeric digit entered at the keyboard (i.e. an ascii character), echo it to the screen, and return in r0 the corresponding numeric value: so if the user types the digit '7', the character '7' will appear on the screen, but the value returned in r0 will be b0000 0000 0000 0111 (#7) you may not use any trap calls in your code - you must implement the "polling" code that interrogates the keyboard status and data registers. ; getnum_tsr ; a subroutine for obtaining a numeric value ; given ascii numeric digit input to keyboard. ; the numeric digit is echoed to the console (e.g. '7' = b0000 0000 0011 0111), ; but the value returned in r0 is the actual numeric value ; corresponding to the digit (e.g. b0000 0000 0000 0111 =