General Category > LisaList2

Unable to boot BLU from seemingly good floppy

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paule:
I just finished cleaning and lubricated the 400K drive in my Lisa 2/10. Using BLU I can Check, Format, Write and Verify a disk with a bootable BLU floppy image. However when I try to boot from the disk, I get a 75 error indicating "System files are damaged" according to Pina. Any ideas about why the disk might be perfectly correct by all tests and yet fail to boot?

compu_85:
Is your Lisa able to boot from other disks? What ROM version is it?

sigma7:

--- Quote from: paule on February 20, 2023, 11:38:56 pm ---Using BLU I can Check, Format, Write and Verify a disk with a bootable BLU floppy image. However when I try to boot from the disk, I get a 75 error

--- End quote ---

Looking at the ROM listings, error 75 is a result of an unexpected exception when trying to read the boot disk.

Since the disk verified after writing, it seems probable the code would read into memory ok, making an illegal instruction or F-Trap/A-Trap exception unlikely.

Double check that the error still occurs after a cold boot (power off then on and try booting the disk), and make sure that the Lisa isn't inadvertently trying to boot from the hard disk... (press space bar during the self test, then when startup-from menu appears, insert floppy and type Apple-2)

When the exception occurs, some of the processor state is saved by the BTERR routine in memory for later examination in service mode, so that may be the next troubleshooting step.

paule:
H rom. I hadn't been able to boot any other disks, but given their unknown state I thought I should start from a know good disk.

At any rate it is working now. Previously I had used <Create BLU DC42 image to write to floppy> to create the in-memory image. This is the one that wouldn't boot. Just now I downloaded the BLU090.dc42 image and wrote that to disk, and success! Interestingly, the BLU090.dc42 wrote much less data to the disk than when using the Create BLU DC42 image function. Of course it is entirely possible that operator error was involved in yesterday's attempt.

Thank you for your help sigma7 - hopefully what you said and what I found will be of help to someone else!

paule:
And thanks for the boot ROM reminder. My 68K is a bit rusty, but I'm loving this :-)

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