The disk operating system works closely together with BASIC in ROM and supports 5.25" or 3.5-inch floppy drives single and double sided. In the past, I was using a self-made Elektor floppy disk controller card and a double sided YE-625 (Y-E Data Inc.) disk drive. With a data separator board on a 610 disk controller, it is working as well.
This YE-DOS called software will link into the BASIC interpreter and provides a conveniently way to work in BASIC program code or directly from the input line. Twenty two new BASIC commands are included as described in the attached YE-OSI DOS X3.54.pdf document.
At boot, start with "D" and Cold start. For example, DIR will show files on the current disk and SEL 0 or SEL 2 will change drives.
If you want to test it and you have already a GOTEK drive connected to your machine, YE-DOS TEST IMAGES.zip includes two HFE disk images, one for the Boot drive and a Demo disk. Both files are 35 track images, up to double sided 80 track drives are possible. If you don't have a GOTEK drive, you can use the attached IMG files on your preferred Emulator.
Set RAM memory to min 32k. Using it with a CEGMON ROM is my preference due to the Backspace capability.
Some utilities can be found on the boot disk, like a disk Format or Chkdsk Basic program. These illustrate how to make use of the new Basic commands. If you insert a new disk into the system, YE-DOS will not automatically detect a newly inserted disk. Type DISK4 and the software will update the presents of a new disks.
In case of a simple disk change, type SEL0 or SEL2 to refresh the FAT directory. The command SEL 2 and DLOD"PINBAL" will load and execute the given program on the second drive.
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Enjoy
Thomas