What are the (disk) operating systems available to the CoCo?
• RS-DOS was the original disk OS for the CoCo. Without a disk drive, the CoCos would run Color BASIC, and you had to purchase the Extended Color BASIC ROM to take advantage of extra graphics! Plugging in the standard (although there were two versions) Radio Shack disk controller, gave you Disk Extended Basic, or RS-DOS. Standard RS-DOS is reviewed in the hardware FAQ. Essentially, the standard disk commands were available, including DIR, OPEN, SAVE, LOAD, CLOSE, INPUT, WRITE, KILL, DSKINI (format), BACKUP, and COPY. • A-DOS was developed by Art Flexser. It came in three versions, ADOS for the CoCo 1 and 2, and ADOS 3 & Extended ADOS 3 for the CoCo 3. It was 100% compatible with RS-DOS if you didn’t need to patch Disk BASIC, and added features to RS-DOS, noteably 40 and 80 track drive support. ADOS came on a disk, and could be loaded into the CoCo, or you could customize ADOS, program an EPROM, and use the EPROM as your disk ROM, therefore booting your CoCo with ADOS. This was a neat,
