Jump to content

Error 42 with most FloppyEmu disk images on Lisa with 400K drive

Recommended Posts

  • 68kMLA Supporter

I've been restoring a Lisa 2 / Mac XL and am having trouble getting it to boot any images on a FloppyEmu. All images except the Mac Works boot image result in error 42. Per the service manual, this indicates "Disk controller timeout".


  • I probed the entire disk controller circuit on the IO board and couldn't find any issues.
  • I checked the capacitor on the Lisa Lite card. It had low ESR and no signs of leakage.
  • The Mac Works image does boot (over about 5 minutes) but gets sac Mac when the system disk image is 'inserted'.
  • I have a known-bad RAM chip (Row E Col 19) that I've ordered a replacement for. Would that chunk of memory interfere with reading from disks?


Any other areas I should focus on?

Link to post
Share on other sites
  • 68kMLA Supporter

I think I had the same problem. I resolved it a few years ago. Don’t know exactly how, but I have a large amount of files on my FloppyEmu SD card which work OK. 

Maybe we could exchange files? So I test yours and you test mine. If you want that please send me a PM. If we find out what’s does the trick we post it here. 

Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...