README.md formatting cleanup
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README.md
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README.md
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# SIMH v4.0
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# SIMH v4.0 - Beta
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## WHAT'S NEW
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Outgoing connections per line (virtual Null Modem cable).
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#### Asynchronous I/O
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Disk and Tape I/O can be asynchronous. Asynchronous support exists for pdp11_rq, pdp11_rp and pdp11_tq devices (used by VAX and PDP11 simulators).
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Multiplexer I/O (Telnet and/or Serial) can be asynchronous. Asynchronous support exists for console I/O and most multiplexer devices.
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* Disk and Tape I/O can be asynchronous. Asynchronous support exists for pdp11_rq, pdp11_rp and pdp11_tq devices (used by VAX and PDP11 simulators).
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* Multiplexer I/O (Telnet and/or Serial) can be asynchronous. Asynchronous support exists for console I/O and most multiplexer devices.
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#### Disk Extensions
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RAW Disk Access (including CDROM)
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A Tokens preceeded and followed by % characters are expanded as environment
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variables, and if one isn't found then can be one of several special
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variables:
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%DATE% yyyy/mm/dd
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%TIME% hh:mm:ss
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%CTIME% Www Mmm dd hh:mm:ss yyyy
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%SIM_VERBOSE% The Verify/Verbose mode of the current Do command file
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%SIM_QUIET% The Quiet mode of the current Do command file
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%SIM_MESSAGE% The message display status of the current Do command file
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Environment variable lookups are done first with the precise name between
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the % characters and if that fails, then the name between the % characters
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is upcased and a lookup of that valus is attempted.
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it is not found, then the original beginning token on the line is left
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untouched.
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##### command aliases
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##### Command aliases
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commands can be aliases with environment variables. For example:
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sim> set env say=echo
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sim> say Hello there
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Hello there
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##### Do command argument manipulation
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The SHIFT command will shift the %1 thru %9 arguments to the left one position.
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The SHIFT command will shift the %1 thru %9 arguments to the left one position.
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### Use Prebuilt Windows Simulators
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