Os++ ROM and Os++ System Disk Manual
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Starting with release 1.73, Atari++ includes not only a full operating system, but a "System disk" that includes a full tool chain around Os++. This features an FMS Overlay Manager to reduce the DOS footprint to 256 bytes, a RS232 serial device handler and a Os++ compliant DUP Menu. Download the System Disk on this page.

The System Disk sources are part of the Os++ sources and available there for download. Please also note the Os++ Manual and Memory Map documenting the tools.