SmartGun microcontroller version history.

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10/01/95 v1.1 - First production release.
10/02/96 v1.2 - Relay driver for grenade launcher barrel swap.
              - #2 key reloads grenades.
              - #7 key = Fire selector increment.
              - #9 key = Fire selector decrement.
27/02/96      - Grenade reload time reduced from 3 to 2 seconds.
              - Cx and Fx time reduced from 1.5 to 1.25 seconds.
08/06/96 v1.3 - 'Phantom Trigger' keyboard scan fix.
              - #5 key = Safety, LSD decimal point = indicator.
              - MSD decimal point = 2 second heartbeat blip.
12/06/96      - Releasing trigger terminates burst fire.
23/06/96      - #3 key = Show Clips and Fire selector settings.
              - #8 key = Silencer (turns off sound and muzzle flash)
              - Lockout signal from sensor now accepted.
              - RS232 interface to allow custom configurations.
19/07/96 v1.4 - 'custom option slot' added to remember custom configuration.
20/01/98 v1.5 - Internal development version for Laser Challenge compatibility (256Hz over 38KHz carrier) - never released.
18/02/98 v1.6 - Production version with Laser Challenge compatibility (248Hz over 57.6KHz carrier).

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