3- What is the difference between: a- MOV BX,[1234H] and LEA BX,[1234H] b- LDS AX,[200H] and LES AXX,[200H]

Q10 Assembly Program Write a PIC18F assembly language program at address 0x200 to add two 8-bit numbers (Sum = N1+N2). Data register 0x20 contains N1. The low four bits of N2 are stored in the upper nibble of data register 0x21 while the high four bits of N2 are stored in the lower nibble of data register 0x21 (e.g. [0x20] = 0x09 and [0x21] = 0x50). Store the sum in data register 0x30, calculate and state the sum value in the comments. or

Help me with these computer architecture questions, please. I need help with questions 3 and 4.

(a) In MIPS machine language, the R format instructions need an additional field (the “funct” field) to specify the instruction type (“add”, “sub”, etc.). Why can’t this be done using just the 6-bit “op” field, which all MIPS instructions have, instead? (b) Give a sequence of MIPS assembly language instructions that adds the contents of $s0 and $s1, storing the result into $s0, if the contents of $s1 are greater than 6. Otherwise, the contents of $s0 should be incremented by 28. In either case, afterwards the contents of $s0 should be copied into $s2. (c) Suppose that the starting address of an array of words is stored in $s0. Give a MIPS assembly language instruction that loads the contents of the second word in the array into $s1. (d) Suppose that A and B are defined using “A: .word 0”, and “B: .space 100”. Give a sequence of MIPS assembly language instructions that calls a procedure “P” with its two arguments being the contents of A and the address of B, using the standard procedure…

Let, in 8086 based system current SP value is FFFAh and the CS, IP and FL values are 7000h, 1000h and 1001h, respectively. Now, if at that instance an interrupt occurs, then show the stack increase and decrease scenario along with changes in SP values and stack contents.