cr1901 changed the topic of ##yamahasynths to: Channel dedicated to questions and discussion of Yamaha FM Synthesizer internals and corresponding REing. Discussion of synthesis methods similar to the Yamaha line of chips, Sound Blasters + clones, PCM chips like RF5C68, and CD theory of operation are also on-topic. Channel logs: https://libera.irclog.whitequark.org/~h~yamahasynths
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<alexisvl>
i've had good results with ufiformat</late>
<alexisvl>
works fine with a couple usb floppy drives i've tried, most disks seem to be recoverable with it - sometimes after a second or third pass
<cr1901>
ufiformat can recover disks :o? I thought it was "the USB equivalent of the fdformat utility".
<cr1901>
Ive been using ddrescue to okay effect
<cr1901>
(though the disk I'm working on now, I will need to try in another drive. Or two. Or three.)
<alexisvl>
not recover data, just clean up disks that keep having consistently bad sectors after high-level formats
<cr1901>
ahhhh, that's a good idea after I recover these disks.
<alexisvl>
not much you can do to recover missing data on a disk that's misreading at that level, other than using one of those adapters that capture the raw output from the read head AIUI
<cr1901>
Trying different drives w/ a ddrescue log _might_ help, under the assumption that some drives are better at reading certain marginal patterns than others
<alexisvl>
that is definitely the case
<cr1901>
but philpem and the vsftpd guy had a blog post recently... trying to go the analog route might be worth it since I have logs where the marginal data lies
* alexisvl
nods
<cr1901>
(and I have plenty of sacrificial 3.5" drives thanks to a file sale at a local computer store years ago :D)
<cr1901>
fire* sale
<alexisvl>
how did i not know what "fire sale" means
<alexisvl>
i was briefly like "uh, it burned down? and had floppy drives left?"
<cr1901>
Tbh, I saw it once on the old Super Mario World cartoon, and looked it up then. Maybe it's not the best term.
<alexisvl>
well, it's amusing, at least
<cr1901>
Mostly "they wanted them out, and it was like $1/drive, so I took the dozen or so they had so I'd never run out"
<alexisvl>
mhm
<alexisvl>
I have much fewer floppy drives than someone who knows me would probably suspect
<alexisvl>
currently, two. one permanently located inside an oscilloscope.
<cr1901>
They're a PITA, but I love them
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<alexisvl>
they make mechanical noises so i am obligated to adore them
<cr1901>
Spinning MFM drives also make lovely grindy noises when powered up after a while :3
<alexisvl>
i still use the things for screenshot capture off the 'scope for work
<alexisvl>
it's gpib'd to my personal computer but not my work one :)
<cr1901>
Nice :D!
<alexisvl>
i still need to play around with the "feature" i "found" (via some else's post online) that it'll run an autoexec script off the floppy on boot
<alexisvl>
surely there's SOME fun that can be had with that
<cr1901>
One thing about DOS that I _vaguely_ remember, but not as much detail as I'd like, is that CONFIG.SYS, IO.SYS, AUTOEXEC.BAT and friends have to start at a certain CHS on a DOS floppy, or boot won't work
* alexisvl
nods - though I'm using "autoexec" in the not literal sense, this is actually vxworks
<cr1901>
ahhh
<alexisvl>
it's a m68k
<cr1901>
Good chip for a good oscilloscope
<alexisvl>
you can load a binary into ram and execute it via floppy boot script, so in theory it should be very very hackable
<alexisvl>
(the most obvious application being unlocking options, but that's boring as this unit has all of em)
<alexisvl>
a slightly annoying impediment is that the schematics have not been released, and the memory map doesn't match the models that have been
<tpw_rules>
which scope?
<alexisvl>
TDS460A
<alexisvl>
Tek
<tpw_rules>
ahh. i have a 2002b
<alexisvl>
i've got a bit of a Thing for CRTs so i had to grab an old monochrome crt model lol. I've got a rigol too but it doesn't see much use
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<tpw_rules>
school still has a stack of 54622d's but i don't know anything about their hardware architecture
<tpw_rules>
except the crt is annoyingly flickery and has really rectangular pixels
<alexisvl>
we had some really ancient HP scopes (with green crt) in some labs and some newer Teks in others
<cr1901>
bad-sector: 512 B, pct rescued: 99.96% Oh COME ON
<alexisvl>
not long ago, I only graduated a few years ago, so the HPs were a little surprising :P
<alexisvl>
cr1901: :(
<tpw_rules>
they are pretty modern all things considered, they were the first generation megazoom scopes. orders of magnitude more memory than my LCD tek :P
<alexisvl>
yeah they look like a similar generation to the Tek on my bench --- right after the software improved to a level very similar to a modern scope, but still having a crt
<alexisvl>
I'd call this 460A basically a modern scope, with a bit less memory
<alexisvl>
those HPs were NOT that lol.
<cr1901>
alexisvl: Tyvm. It MIGHT be fine. I MIGHT have an old copy of the data, but not an image. These disks were already marginal when I last tried a rescue. But the .imgs/ddrescue .logs are lost. So I have to redo it.
* alexisvl
nods
<tpw_rules>
does it only have like 2k points?
<alexisvl>
this model has the extended memory option and it has like 20k or something like that
<alexisvl>
maybe more, I don't remember
<tpw_rules>
ooooooooooooh /s
<alexisvl>
actually using the long record length is definitely a little more awkward than it is on a newer scope, so I don't use it unless I actually need to
<tpw_rules>
mine is stuck at 2.5k. it's kind of sad imo
<alexisvl>
(and frankly, half the time I just move the probe over to the analog scope above it and use the delaying timebase, if I'm lucky enough to have a repetitive signal)
<alexisvl>
I should rescind the claim that it's like a modern scope slightly, certainly one thing my Rigol does way better is navigate a long, deep acquisition. So that's the place where it's lacking.
<alexisvl>
years of having only an analog have trained me to be pretty good at setting things up to produce repetitive waveforms where I don't need that though :)
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