LC3 TRAP's Instructions -


this question that's giving me lot of trouble, need understand final exam in 2 weeks. don't know if it's wording, have no idea how arrive @ concrete answer. here's question:

"bob plans make changes mechanism of lc-3 trap instructions. has 2 ideas: make use of bit [8:11] of trap instructions. first instruction of trap routine stored @ address specified in trap instruction, rather starting address of trap routine. in new design, still wants implement many trap routines original lc-3 trap. calculate on average how many lines of instructions each trap routine have in new design."

i know trap has 3 fundamental trap vectors, x20, x25, , x23? "how many lines of instructions" mean?

is class using mc graw hill lc-3 simulator? because reading through text on trap command, bits [8:11] aren't sent mar load memory, they're dropped. bits [7:0] used because point location in trap vector table.

copyright mc graw hill

memory locations x0000 through x00ff, 256 in all, available contain starting addresses system calls specified corresponding trap vectors. region of memory called trap vector table.

the vector table using 6 of 256 available trap vectors, make 250 of own trap calls.

after trying "bob" trying following error "1024 can not represented 8 bit trap vector" , when try , manually fill in own trap call (ex. trap400 .fill xf400 ;which 1111 0100 0000 0000) won't run subroutine.

that being said, question can mean bob making his own version of lc-3 , increase amount of trap vectors can use. if that's case using bits [11:0] have 4,095 trap commands or 4,089 if not include original 6.

i hope helps.


Comments

Post a Comment

Popular posts from this blog

asp.net mvc - SSO between MVCForum and Umbraco7 -

i need integrate sso between mvcforum (forum of company) , umbraco7 (manages cms company). however struggling shared authentication work. tried several ways suggested on other threads still not running expected. here did: 1. in mvcforum (forum.mywebsite.com) 1.1. machine key in web.xml: <machinekey validationkey="the same key umbraco7" decryptionkey="the same key umbraco7" validation="sha1" decryption="aes" /> 1.2. authenticate forms in web.xml <forms name="my-sso-auth" protection="all" path="/" timeout="43200" domain="forum.mywebsite.com" loginurl="/members/logon" enablecrossappredirects="true" /> 2. in umbraco7 (news.mywebsite.com) 2.1. machine key in web.xml: <machinekey validationkey="the same key mvcforum" decryptionkey="the same key mvcforum" validation="sha1" decryption="aes" /> 2.2. a
Read more

Python Tkinter keyboard using bind -

i have problem using bind option can click button in keyboard, , call function once key pressed. tried taking other codes have similar purpose , saw i'm doing pretty same, though still have problem must've missed. thankful if me this. here's code: # -*- coding: utf-8 -*- #imports tkinter import * pil import imagetk, image import time import tkmessagebox #===========================================================================================================================================# #tkinter class class app(frame): def __init__(self, master=none): frame.__init__(self, master) self.pack() #===========================================================================================================================================# #game pieces classes class board: def __init__(self, rows = 7, columns = 6, picture_height = none, picture_width = none): self.rows = rows self.columns = columns self.picture
Read more

ubuntu - Selenium Node Not Connecting to Hub, Not Opening Port -

i'm trying set demo selenium grid. have digital ocean ubuntu 14.02 droplet. (i have 2 , tried set using 2 different machines got nowhere.) i'm trying run hub , node both locally. here input both hub, node, , nmap results. https://gist.github.com/mekhami/d5bbecca5ff0de9d2dc9 so, node starting tcp connection reset , port it's supposed operate on closed. i have had no luck in number of different options , configurations work. but... of course, worked randomly once. don't know why, don't know did, know 1 brief moment, node connected , saw on grid console. tried run test , went down again , i've never seen come up. please let me know more information can provide. update: randomly came online again. don't know happened, might related timeout or time_wait or going on. this because vm/server not have enough entropy available. to resolve problem, install haveged (or other similar things). the instructions of how install haveged on ubu
Read more