Load the following program into the PDP8/E and run it. The program starts at address 0200, and expects the switch register to contain some number N at the time execution begins. The program computes some number, depending on the value of N, and puts the computed number into the accumulator before halting.
Your assignment is (1) to figure out what this program does, and (2) to comment the code as fully as you can. I recommend that you run the program a few times with a variety of small values of N. You should start to recognize a pattern. In class on Friday, we will look more closely at this program.
Addr Instruction 0200 7201 CLA IAC 0201 3232 DCA A 0202 7201 CLA IAC 0203 3233 DCA B 0204 7404 OSR 0205 7041 CMA IAC 0206 3235 DCA NEGN 0207 2235 ISZ NEGN 0210 7410 SKP 0211 5227 JMP END 0212 2235 ISZ NEGN 0213 7410 SKP 0214 5227 JMP END 0215 7200 GUTS, CLA 0216 1232 TAD A 0217 1233 TAD B 0220 3234 DCA C 0221 1233 TAD B 0222 3232 DCA A 0223 1234 TAD C 0224 3233 DCA B 0225 2235 ISZ NEGN 0226 5215 JMP GUTS 0227 7200 END, CLA 0230 1233 TAD B 0231 7402 HLT 0232 0000 A, 0000 0233 0000 B, 0000 0234 0000 C, 0000 0235 0000 NEGN, 0000