General Category > Lisa Troubleshooting and Repair
Restoration of a Lisa 1
blusnowkitty:
Wow, awesome find regardless. I hope I can one day get a Lisa 1 :D
If it's not against the rules to ask, would you be able to dump the boot ROM and the I/O ROM? I don't think ROM B exists anywhere online and it would be great to preserve it.
rayarachelian:
--- Quote from: blusnowkitty on April 29, 2020, 08:56:32 am ---Wow, awesome find regardless. I hope I can one day get a Lisa 1 :D
If it's not against the rules to ask, would you be able to dump the boot ROM and the I/O ROM? I don't think ROM B exists anywhere online and it would be great to preserve it.
--- End quote ---
Nope, not against the rules, but it is all boot ROM versions are available on bitsavers: http://bitsavers.org/bits/Apple/Lisa/firmware/
http://bitsavers.org/bits/Apple/Lisa/firmware/341-0175-B.BIN and http://bitsavers.org/bits/Apple/Lisa/firmware/341-0176-B.BIN
That said, you're better off with version "D" for Lisa 1's and "H" for Lisa 2's as they fix bugs. D is actually compatible with both 1s and 2s. I couldn't tell you exactly what bugs, but if you really care you can read the source code for H and see the changes between B and C,D to see what was fixed, you can find that here: http://bitsavers.org/pdf/apple/lisa/firmware/
What I don't see are the I/O ROM version 40 (for twiggies), A8 (88 and its source is up there), and the hacked SunRem version that allows 800K double sided floppies. There's apparently a Lisa driver for the double sided floppy up on macintosh garden: https://macintoshgarden.org/apps/lisa-office-system-800k-driver
blusnowkitty:
--- Quote from: rayarachelian on April 29, 2020, 09:14:13 am ---Nope, not against the rules, but it is all boot ROM versions are available on bitsavers: http://bitsavers.org/bits/Apple/Lisa/firmware/
http://bitsavers.org/bits/Apple/Lisa/firmware/341-0175-B.BIN and http://bitsavers.org/bits/Apple/Lisa/firmware/341-0176-B.BIN
That said, you're better off with version "D" for Lisa 1's and "H" for Lisa 2's as they fix bugs. D is actually compatible with both 1s and 2s. I couldn't tell you exactly what bugs, but if you really care you can read the source code for H and see the changes between B and C,D to see what was fixed, you can find that here: http://bitsavers.org/pdf/apple/lisa/firmware/
--- End quote ---
Hey thanks for that! Somehow I never found that link when I was searching for ROMs for mine.
snuci:
--- Quote from: rayarachelian on April 29, 2020, 09:14:13 am ---What I don't see are the I/O ROM version 40 (for twiggies), A8 (88 and its source is up there), and the hacked SunRem version that allows 800K double sided floppies. There's apparently a Lisa driver for the double sided floppy up on macintosh garden: https://macintoshgarden.org/apps/lisa-office-system-800k-driver
--- End quote ---
My ROMs are here: http://www.vintagecomputer.ca/files/Apple/Lisa/firmware/Lisa1/
The I/O ROM is marked 341-0138 Rev F
patrick:
--- Quote from: rayarachelian on April 28, 2020, 06:57:18 pm ---You can probably still buy them from here: https://www.athana.com/html/diskette.html not sure if you'll need HD or DSDD, I'd try with both and see which work better. Maybe degauss them before you format them if they're PC formatted.
--- End quote ---
Twiggy disks have 46 tracks per side (62.5 tpi). Data density is around 9.500 FTPI with a rotational speed of 218 rpm at the outer tracks and 320 rpm at the inner tracks. This gives you 22 blocks at the outside and 15 blocks at the center of the disk. Nominal coercitivity is 600 oe (24 kA/m), this is "HD" media.
If you hold the disc against a light source and the light shines through weakly, it is HD. SD/DD material is deep black.
BTW: keep in mind that if you replace the I/O board with one from a Lisa 2/5 a pulldown resistor has to be added to the SNS line (R47 = 1 kOhm).
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