General Category > Lisa Troubleshooting and Repair
M0130
sigma7:
--- Quote from: jamesdenton on February 13, 2023, 07:02:26 pm ---
--- Quote from: andrew on February 13, 2023, 05:51:55 pm ---Does that 800K rom upgrade only work with certain LOS versions? If so, do incompatible versions only see it as a 400K drive?
--- End quote ---
Good question. I'll have to defer to @sigma7 on that one.
--- End quote ---
Sorry --- I don't know anything about using 800K drives/ROMs with LOS (or the Workshop, or *nix)!
I think the "Universal" 400K/800K I/O board ROM might work with all environments when a 400K drive is attached (which means that if an 800K drive is not compatible, you could swap drives without swapping ROMs). However I don't recall if I've tested that.
AlexTheCat123:
I've tried quite a few different floppy drive configurations over the years and from what I remember, the universal 400K/800K ROM works with all environments regardless of whether you have a 400K or 800K drive installed.
If you have an 800K drive installed in the system and your environment doesn't support double-sided disks, it will just behave like a 400K drive, so it shouldn't ever be necessary to install an actual 400K drive if you don't want to.
I'm not sure if an 800K drive works as a 400K drive with the standard 400K ROM installed, but from what little I now about the floppy interface, I don't see any reason why it wouldn't.
You do need a special driver to get full 800K disk support in LOS, but as I said before, an 800K drive will work just fine without the driver; you'll just only have access to 400K of the disk. I'm not sure if the driver works for all versions of LOS; I think it might only work with LOS 3.
andrew:
So, it sounds like I can get away with just getting one of those 800K drive brackets and finding an 800K drive from a donor mac. It's definitely a cheaper solution, and later when I find a ROM I can just swap it out and get full functionality. I think I might even have a couple spare drives in a box somewhere. Can I take an 800K drive from any old mac?
AlexTheCat123:
--- Quote ---Can I take an 800K drive from any old mac?
--- End quote ---
Yep! Any 800K drive should work just fine.
compu_85:
I can't say I've ever run anything earlier than LOS 3.1 on my my machines. I can say the updated 800k rom works great with LOS 3.1 and UniPlus+.
-J
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