Frisbee Electronics
Information on Softalk V1N4, Dec. 1980, page 33.
s/n Name    
  CHRONTRONIX ACV-1
Frisbee Electronics announces a real-time clock for the Apple, the Chrontronix ACV-1. Three-year battery backup requires no recharging. Clock includes complete clock features plus programmable interrupts. Slot independent firmware allows easy access from Basic. Features include power-down ROM and high accuracy crystal. Software set to date forms, allow stop-watch functions, time conversions, is available on cassette or disk. $109