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A project log for OMNI 4 - a Kaypro 2x Logic Analyzer

A while back I acquired a rare logic-analyzer, whose lone system-diskette needed backing-up. Now this page is all things OMNI 4

eric-hertzEric Hertz 09/11/2017 at 02:140 Comments

Use IMD117 (118 doesn't extract properly)

Settings, Attempt 1:

Cyl: 40

Double-Step: Disabled

(Presumably: Since a 1.44MB drive can work with 720KB floppies in an IBM/PC configured for a 360K drive: the 720KB "notch" indicates to the drive to double-step. I'm using a 1.44MB disk, with the notch covered)

---- Write Disk From File ----

LOTS of notes in disk image... too many to see on-screen.

(Isn't there a viewer utility that came with imagedisk????)

"Written with R/W Gap=20, Format Gap=23"

...

ImageDisk reports, while writing:

"A: 250k DD" (250kbps?)

"G1:7" "G2:14" (???)

"21/1: Write error <19> NoData" ???

"33/0: Write error <8> NoData" ???

"800 sectors (100 Compressed)

 Write complete..."

The scrollbar at the top shows only half the disk written (?)

Did the drive not double-step automatically? Or...?

Also... I thought 360K drives were 300kbps, but then they wouldn't be interchangeable...?

Note that I used "Calculated" for gaps rather than entering the aforementioned values.

Disk wrote, despite odd gap-lengths necessary for fitting 10 sectors... so... maybe a go.

Time to throw the 3.5in drive in the KayPro.

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Oh, obviously managed to get the 486 laptop's floppy drive working... Tried another belt. This one smaller (both require quite a bit of stretching) in diameter, but thicker material. Stretch was harder... Thought: The other might've been too stretchy while spinning? Who knows.

Odd effects using disks made in linux under win95... "mkfs.vfat -I /dev/sdb" may have some issues... as formatting under windows (DOS) then using on the linux machine seems to be fine. Odd effects include: disks showing less available space than they should, files written to disk appearing *very* strange when 'dir'ed... including one 'directory entry' which appeared to be the contents of a file? Oddly, these disks work fine under linux.

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