The Atari ST lacked a built-in real-time clock (RTC), meaning that upon every boot, users had to manually set the date and time unless they had an external solution. To address this, several clock cartridges were developed, providing battery-backed real-time clocks that could keep track of time even when the computer was turned off. These cartridges typically plugged into the Atari ST’s cartridge port and were useful for applications requiring accurate timekeeping, such as file management, BBS operation, and scheduling software.
Forget Me Clock II x2
- Manufacturer: Désiré.
- Features: A successor to the original Forget Me Clock, improving battery life and compatibility with newer Atari ST models.
- Software: Came with an updated time-setting utility and better integration with the Atari desktop environment.
- Usage: Used by business users, hobbyists, and developers for ensuring reliable system time tracking.
Microdeal Clock x2
- Manufacturer: C-Lab, known for music and MIDI accessories for the Atari ST.
- Features: Offered an auto-updating time feature, ensuring time consistency across reboots.
- Software: Came with a driver to sync the clock with system software.
- Usage: Primarily aimed at Microdeal software users, ensuring correct timestamps in supported applications
Other Clock Cartridges
Several other third-party RTC cartridges were available, each designed to solve the lack of a built-in clock on the Atari ST. Some models were bundled with BBS software or business applications that required accurate timestamps.
Legacy of the Atari ST Clock Cartridges
While modern solutions such as RTC add-ons for emulated or upgraded Atari ST systems have made these cartridges less necessary, they were essential for accurate file timestamps, automation, and professional applications during the Atari ST's peak years. Today, original clock cartridges are rare collector’s items, with some enthusiasts modifying them with modern battery replacements to keep them operational.
The Microdeal Clock uses a Saft 40LF220 battery, I have made an adapter PCB so that you can use a 2032 coin cell instead. You will need to solder on a surface mount coin cell holder.