1. Redesign and simplify delay and time deviation adjustment algorithm
in global SetCallback function; reinstate alpha parameter to control
adjustment decay rate.
2. Correct memory stores during tape drive backward read.
3. Compare tape image file extensions in case-insensitive manner.
4. Detect dropouts (no flux change) in magnetic tape images.
5. Suppress printed SPO greeting after power-on.
6. Disable (for now) the ConsolePanel lamp test.
7. Update stacker progress meter and stacker-full annunciator when
emptying a stacker.
8. Supply (benign) terminating semicolons in ConsolePanel method
declarations.
9. Optimize extraction of MSCW address during Character Mode exit.
10. Miscellaneous minor additions and enhancements to scripts in tools/
directory.
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