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Download B441 Laboratory Experiments - Computer Science
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Lab 11 B441 LABORATORY MANUAL page 79 5020 with 7200 5021 with 1217 5022 with 1200 5023 with 7440 5024 with 5222 5025 with 7040 Load the PC with 5020 and step through the loop until it ends and the AC is complemented. Here, SZA is used for the loop condition. Make sure to note the skip sense in the SZA instruction. How are the skip conditions in the ASM related to the architecture of this PDP-8 implementation? Those Pesky Subroutines Here we exercise the JMS instruction, which is the key to good program organization. Load the following memory locations: 5050 with 7200 5051 with 4261 5052 with 4261 5053 with 4261 5054 with 7200 5060 with 0007 5061 with 7777 5062 with 1260 5063 with 5661 Load the PC with 5050 and step through the subroutine calls. What does the subroutine do? Note how the "argument" is passed along to the subroutine. Note also how the subroutine returns. That’s enough manual control! On to the full PDP-8! Copyright ©2000 Indiana University Computer Science Department
