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StanWarford / pep9suite

Pep9Suite is a suite of software for the Pep/9 virtual machine described in the text Computer Systems, J. Stanley Warford, fifth edition.
http://computersystemsbook.com
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Reading from CharOut, writing to CharIn. #86

Closed Matthew-McRaven closed 4 years ago

Matthew-McRaven commented 4 years ago

What happens when you write to a CharIn, read from a CharOut?

Reading from CharOut returns the last character that was written. Writing to CharIn modifies the memory address (visible in the Memory Dump Pane), but is not readable because it is memory mapped IO.

StanWarford commented 4 years ago

Added Memory-mapped I/O section to Help Reference page.