York University Faculty of Liberal Arts and Professional Studies School of Information Technology AP/ITEC 1000-N: Introduction to Information Technologies Winter 2019 Assignment #1 Due Date: by 11:55 PM on the date indicated on the course website for your section. Submission method: via Moodle (only specified file types below can be uploaded) This Assignment is worth seven percent (7%) of the total final grade. Put the two tables required in an Excel file and submit the single file to Moodle. See FAQ file on www.pateanu.ca/yorku for late assignment rules. What You Need to Do In this assignment you will create a simple LMC program to input a series of numbers and count them. The numbers will be placed sequentially in the In Basket of the LMC. The number 000 will be used to mark the end of the series of numbers. 000 is not considered as part of the series and should not be counted. Your program will read each number in order and will store it somewhere in memory. Because the memory of the LMC is limited to 100 mailboxes, some of which are going to be used for your program, you must set up a limit to how many numbers you can read and store (your choice, but obviously somewhat less than 100 and leave enough room for your program too). Your program must work for ANY number of input values. Your program will stop reading numbers from the In Basket when one of the following two conditions is met: a) The special “marker” number 000 was read from the In Basket, or b) The storage limit you set up was reached When the program stops reading numbers from the In Basket, it should output the count (how many numbers, marker not included, were read) and stop. The program should be presented in a table format like the sample below (you may recognize this program as Figure 4.4 from the textbook): Mailbox # Op Code Address Comment 00 IN Read in first data item 01 STO 10 Store first number in mailbox 10 02 IN Read in second data item 03 STO 11 Store second number in mailbox 11 04 SUB 10 Subtract first number from second number 05 BRP 08 Positive result, branch to printing it 06 LDA 10 Negative or 0 result, reverse order 07 SUB 11 Subtract second number from first number 08 OUT Send the positive difference to the Out Basket 09 COB End of program 10 DAT Storage for the first number 11 DAT Storage for the second number …. 99 Use Microsoft Excel to create this table. Make sure to: – Show all memory mailboxes in use (you can use the ellipsis symbol … to represent unused mailboxes, or mailboxes with the same use as its neighbours, to avoid repetitive information) – Include helpful comments (not restatements of the meaning of the op code) – Identify the actual address part, where addresses are relevant To test this program, you need to consider all the possible scenarios: a) No numbers (first input is the marker 000) b) Some numbers below the capacity limit are entered c) More numbers than the capacity limit are entered. Make sure your program works correctly in all three scenarios. Pick either scenario b) with 3 numbers entered, or scenario c) using 3 as the capacity limit and show the complete content of the LMC after each instruction is executed. Put the results in a table like this (the table below is the actual testing data for the program sample in the first table, using 069 and 047 as input numbers): Content after instruction Initial 1 2 3 4 5 6 7 8 9 … Accumulator 000 069 047 -022 069 022 Loc. Counter 00 01 02 03 04 05 06 07 08 09 Mailbox # 00 901 01 310 02 901 03 311 04 210 05 808 06 510 07 211 08 902 09 000 10 000 069 11 000 047 In columns labelled 1, 2, 3, etc. do not enter values that have not changed from the previous column (otherwise it is very hard to mark). Breaking this requirement will result in a one mark penalty. Marking scheme: – 3.5 marks for the correct program – 3.5 marks for the correct test table – A subtractive marking scheme will be use (i.e., 0.25 marks will be subtracted for each error) – An error is wrong content in any one of the cells of your two spreadsheets. Don’t forget: When in doubt, ask!

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A1.doc

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