Apple-2-SW/prodos-drivers
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Joshua Bell 2022-11-18 18:46:33 -08:00
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clocks/README.md
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# ProDOS Clock Drivers
Other than the Apple IIgs model, the Apple II did not ship with a real-time system clock. Many third party [Apple II system clocks](https://en.wikipedia.org/wiki/Apple_II_system_clocks) were produced in the 1980s, and many new system clocks are available, either as entirely new designs or recreations.
The ProDOS operating system for the Apple II personal computer line natively supports the Thunderclock real-time clock card, but there is a protocol for custom clock drivers to be installed:
* Check `MACHID` bit 0 to see if a clock is already active; abort if so.
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This directory includes drivers for the following real-time clocks:
* No-Slot Clock
* [No-Slot Clock](https://www.reactivemicro.com/product/no-slot-clock/)
* [ROMX Real-Time Clock](https://theromexchange.com/)
* [FujiNet Clock](https://fujinet.online/)
* DClock
* Cricket!
* Applied Engineering DClock
* ROMX Real-Time Clock
* FujiNet Clock
All follow the above protocol: install only if there is not already a clock, probe for the clock before installing, and chain to the next driver.