Mostly I just use the RRPlay cart of late. Ended up with this thing decades ago and usually ignored it for my 1541 back at home with the old man, but it's the only 5.25 I have this side of the country. Wish I could set it to device 9 or 10. There's no jumpers. I ripped and dumped the ROM last night and the heads are now aligned. Definitely has a superior construction strength compared to the 1541-II's but not the original tool-box 1541.
Thanks for the tip.. I expect plenty of incompatibilities
Works though and the first one does something else. Still looking into this.