21 lines
1.4 KiB
Markdown
21 lines
1.4 KiB
Markdown
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# ProDOS Drivers
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[](https://travis-ci.org/a2stuff/prodos-drivers)
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The ProDOS operating system for the Apple II executes the first `.SYSTEM` file found in the boot directory on startup. A common pattern is to have the boot directory contain several "driver" files that customize ProDOS by installing drivers for hardware or modify specific parts of the operating system. These include:
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* Real-time Clock drivers (e.g. No-Slot Clock, Cricket!, AE DClock, etc)
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* RAM Disk drivers (e.g. RamWorks)
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* Quit dispatcher/selector (`BYE` routines)
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Early versions of these drivers would often invoke a specific file on completion, sometimes user-configurable. The best versions of these drivers simply execute the following `.SYSTEM` file, although this is non-trivial code and often did not work with network drives.
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This repository collects several drivers and uses common code to chain to the next `.SYSTEM` file, suporting network drives. An example disk catalog might therefore include:
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* `PRODOS` - the operating system
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* `NS.CLOCK.SYSTEM` - install No-Slot Clock driver, if present
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* `CRICKET.SYSTEM` - install Cricket! driver, if present
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* `RAM.DRV.SYSTEM` - install RamWorks RAM disk driver, if present
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* `BUHBYE.SYSTEM` - install a customized Quit handler
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* `QUIT.SYSTEM` - invoke the Quit handler immediately, as a program selector
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