20250122 - v2.2.5
  - Modified shell capture behavior.  Previously, the SH pin had to be
    pulled low to access the shell even after a capture operation.  Now,
    when the shell is captured at startup, it will remain active until reset.  

20250121 - v2.2.4
  Syncronized with SSR-1U 2.2.4, adding the following fixes and updates:
  - BugFix: Time Tagged archives failed to start with a Time Correlation
    Packet when opened as part of a close/open operation based on a configured
    file size or time costraint.
  - BugFix: Fixed shell issue where bad boolean options weren't rejected as
    syntax errors.  Also made the acceptable boolean words case insensitive.  
  - Updated the non-inverted command sources to display with a leading '+'
    in config and status shell output for clarity.
  - BugFix: Fixed relative path support in the shell for exFAT volumes.  
    Now cd .. works and pwd provides correct results on exFAT.
  - The shell current working directory is now preserved after volume remount
    operation (e.g., card removal/insertion) if possible.
  - BugFix: Shell command sz included specified path with the zmodem 
    transmitted filename and should not.
  - BugFix: Fixed the shell time command to correctly set times using the AM/PM 
    designator on the 12th hour.  Previously, times entered as 12AM were 
    registered as 12PM and vice versa.
  - BugFix: Fixed shell to prevent extra characters from being consumed
    when using backspace in the middle of a command line.  Line editing using
    backspace now works correctly.
  - BugFix: Fixed issue recognizing a single forward slash as a valid path
    in the shell.
  - Bug Fix: Corrected a problem that caused tagged line timestamps to be
    occasionally inserted soon after a new file was opened.
  - Bug Fix:  Corrected a rare problem in which the seconds of a timestamp
    could be incremented prior to the fractional seconds, resulting in a 
    timestamp sequence with seconds like: 2.907, 3.999, 3.091
    
20191010 - v2.1.1
  - Fixed bug introduced in v2.1.0 that prevented periodic file system sync.
    Without periodic sync, data in unclosed files was not preserved on
    power loss.
  
20190906 - v2.1.0
  - ******** NOTE ********  
    **  This firmware will invalidate stored configuration information  
    **  of previous firmware versions, returning all parameters to default 
    **  factory settings.  Make note of the stored configuration of the 
    **  SSR-1 prior to updating the firmware.
    **********************
  - Support for exFAT, and SDXC cards
  - Minor performance improvements
  - Added support for 7 bit data frames (with even or odd parity)
  - Bug Fix: corrected problems with parity enabled reception
  - Added options to disable on-board LEDs to conserve power

20180227 - v1.2.1
  - Recognize 0xA (in addition to 0xD) as a line-end for the new tagged line
    record type.  Now, either character will trigger a timestamp on the next
    printable character.

20180213 - v1.2.0
  - Added a new record file type 'tl' (tagged line) that does native time
    stamp tagging of line oriented text.  Timestamps are inserted before the
    first printable character (ASCII 0x21 to 0x7E) following a CR (0xD).
    Timestamp format is YYMMDDhhmmss.sss followed by a space.
    To enable the mode, use the shell command 'cfg file type tl'

20170424 - v1.1.0
  - Added support for card power control (power cycle reset) in future 
    hardware revisions.  
  - Protected card writes with CRC to improve robustness during power events.
  - Improved zModem file send performance.

20161122 - v1.1.0-beta
  - Added sz command to shell for sending files using zmodem protocol.
  - Increased max speed for standard configuration from 115200 to 230400 baud.
  - Added support for a high speed variant that can record at 460800 baud.
  - Modified file path parsing in the shell to allow for shell command 
    arguments that begin with '-'.  File names can no longer begin with '-'.

20160504 - v1.0.2
  - Bug Fix: Time tagged archives were not getting periodically flushed so
    that the last several bytes received might not get preserved on loss of 
    power.
  - Reduced latency between changes in the record command state and action
    by the logger.

20150501 - v1.0.1
  - Bug Fix:  Shell could not reset com channel stop bits to 1.  Config erase 
    was required to restore stop bits to default value of 1.

20140506 - v1.0.0
  - First released version.