This archive contains untested DOS/65 disk images for Dos/65 2.01 and possibly an older version.
DOS/65 is a CP/M-like operating system written for the 65xx processors by Richard A. Leary.
The accompanying text file for each disk contains the output from the OSIHFE utility to show directory contents and any obviously damaged files.

This Dos/65 version requires a C4P class machine (OSI540 video & polled keyboard) with 48K memory.

To start Dos/65 first insert the Dos65 Loader disk. This disk contains a traditional OSI boot loader located at $2200. Upon successful boot, you should see:

DOS/65 LOADER
INSERT DOS/65 DISK IN DRIVE A
TYPE RETURN WHEN READY_

At this point you can use any DOS/65 disk that contains the operating system such as:
DOS65-1.65d
DOS65-2.65d
DOS65-3.65d
DOS65-4.65d
DOS65-5.65d
[which all generate a prompt which looks like:]

48K DOS/65 V2.01
HOW MANY DRIVES (1 TO 4)? 2
A>_


or the following disks 
DOS65COM.65d
DOS65NSM.65d
SYSGEN.65d
DOS65B.65d
[which generate a prompt which looks like:]

48K DOS/65
DRIVES (1 - 4)? 2


Most DOS/65 disks are formatted like traditional CP/M floppys which contain a copy of the operating system on the first 3 tracks, a director on track 4 (5.25") (track 3 on 8") with a block allocation map.  Each disk block is 128bytes long. Each DOS/65 track starts with an OSI style track header followed by an 8-sector header including track 0.  This follows OSI OS65D format except track 0 contains sector data instead of a boot track. Each OSI 5.25" disk track can hold 16 DOS/65 blocks.

