The “text flash” command is implemented via the animation engine. See the “ani” commands. These allow you to create animations like a flashing LED or animation like a fluttering butterfly. Example:
// bitmap 10 and 11 are "indicator off" and "indicator on" respectively
// this sets up the animation script, script # is 0
ani 0 xi 10 0 0 // display indicator on
ani 0 y 1000 // yield for 1000ms (1 second)
ani 0 xi 11 0 0 // display indicator off
ani 0 y 1000 // yield for 1000ms (1 second)
// enable script 0
anie 0