Two Brand New ENSONIQ ASR-10 Operating System Disks; version OS 3.53 and OS 1.25 with 7 Samples and 13 Effects. The OS 3.53 Boot Disk requires ROM 1.50B Eproms (see notes below). The OS 1.25 Boot Disk requires ROM 1.00 Eproms (see notes below).

If you don't know which internal ROM Eproms that your ASR-10 keyboard has, there are only 2 ways to find out which OS version you need. Either try OS 3.53 or OS 1.25, or open up the ASR-10 and look on the motherboard to see which version of the ROM Eproms it has. 

The ASR-10 must be booted with the Operating System each time you turn it on. After you Boot the ASR-10, you then must load in a Sample. Each of these Disks has an OS, 7 samples, 12 44.1khz effects, and a parallel effect. You must have a working floppy drive or a compatible SCSI drive to boot the ASR-10.

When you buy these OS Disks, I will make a copies with brand new diskettes, and boot an ASR-10 with the Disks before it ships. This will guarantee that the Disks you receive will be brand new and tested. If you have an ASR-10 that won't boot up, the first thing to try is a new OS Disk. Its very common for a floppy diskette to go bad. You should always make back-up copies of your work and have a back-up copy of the OS Disk. If the new OS Disk doesn't boot the ASR-10, then you need to consider the floppy drive or other problems.

IMPORTANT NOTES about the OS VERSION and ROM EPROMS; The Operating System (OS) for the ASR-10 is contained on a floppy disk. There are also two Eprom chips on the circuit board that contain the Firmware (ROM), which is the more basic operating instructions. The early version of the Eproms was ROM 1.00. If your ASR-10 has ROM 1.00 Eproms, the OS 3.53 Boot Disk is not compatible with your ASR-10. You need the OS 1.25 Boot Disk. Most ASR-10's have ROM 1.50B Eproms, which is compatible with the OS 3.53 Boot Disk. The ASR-10 RACK was released with the ROM 1.50B Eproms, so the OS 3.53 Boot Disk is compatible the RACK. When you try to boot your ASR-10 keyboard with the OS 3.53 Boot Disk and you get the "INCOMPATIBLE OS VERSION' message, this means you have ROM 1.00 Eproms and need the OS 1.25 Boot Disk.

I also sell the OS 3.53 Boot Disk and OS 1.25 Boot Disk separately in my Ebay Store, SynthPlus.

Email me with any questions.