Replacing floppy
in [Design]
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From: Nico Coesel on 28 Apr 2010 13:44 Grant <omg(a)grrr.id.au> wrote: >On Mon, 26 Apr 2010 19:06:09 GMT, Jan Panteltje <pNaonStpealmtje(a)yahoo.com> wrote: > >>On a sunny day (Sun, 25 Apr 2010 18:27:31 GMT) it happened mzenier(a)eskimo.com >>(Mark Zenier) wrote in <hr4f1h073i(a)enews2.newsguy.com>: >> >>>In article <hr16eu$90e$1(a)news.albasani.net>, >>>Jan Panteltje <pNaonStpealmtje(a)yahoo.com> wrote: >>>>The serial protocol is either MFM or FM, NRZ code, with CRC added for >>>>each sector. >>> >>>Not NRZ. For both input and output, it's a short (100-300 ns) pulse >>>for each flux transition. For the input, inside the drive it's the >>>clock for a T flip-flop that (gated by the enables) drives the head. >>>For output, it's a one-shot triggered by a peak detector. >>> >>>Mark Zenier mzenier(a)eskimo.com >>>Googleproofaddress(account:mzenier provider:eskimo domain:com) >> >>I think you are wrong: >> >> http://en.wikipedia.org/wiki/Modified_Frequency_Modulation >> >><quote> >> As is standard when discussing hard drive encoding schemes, >> MFM encoding produces a bit stream which is NRZI encoded when written to disk. >> A 1 bit represents a magnetic transition, and a 0 bit no transition. >><end quote> >> >>I should know, I designed a multi standard floppy controller board, >>and it works :-) >>It has one of the lowest error rates in the universe, ZERO. >>Want the diagram? > >I would like to replace the floppy interface in a TDS3034 DPO with some >USB or Ethernet interface. Is the TDS3034 PC based? Open it up. Maybe there is some slot (PCMCIA, mini-PCI or ISA) that will take a network card. -- Failure does not prove something is impossible, failure simply indicates you are not using the right tools... nico(a)nctdevpuntnl (punt=.) --------------------------------------------------------------
From: Grant on 28 Apr 2010 16:59 On Wed, 28 Apr 2010 17:44:20 GMT, nico(a)puntnl.niks (Nico Coesel) wrote: >Grant <omg(a)grrr.id.au> wrote: > >>On Mon, 26 Apr 2010 19:06:09 GMT, Jan Panteltje <pNaonStpealmtje(a)yahoo.com> wrote: >> >>>On a sunny day (Sun, 25 Apr 2010 18:27:31 GMT) it happened mzenier(a)eskimo.com >>>(Mark Zenier) wrote in <hr4f1h073i(a)enews2.newsguy.com>: >>> >>>>In article <hr16eu$90e$1(a)news.albasani.net>, >>>>Jan Panteltje <pNaonStpealmtje(a)yahoo.com> wrote: >>>>>The serial protocol is either MFM or FM, NRZ code, with CRC added for >>>>>each sector. >>>> >>>>Not NRZ. For both input and output, it's a short (100-300 ns) pulse >>>>for each flux transition. For the input, inside the drive it's the >>>>clock for a T flip-flop that (gated by the enables) drives the head. >>>>For output, it's a one-shot triggered by a peak detector. >>>> >>>>Mark Zenier mzenier(a)eskimo.com >>>>Googleproofaddress(account:mzenier provider:eskimo domain:com) >>> >>>I think you are wrong: >>> >>> http://en.wikipedia.org/wiki/Modified_Frequency_Modulation >>> >>><quote> >>> As is standard when discussing hard drive encoding schemes, >>> MFM encoding produces a bit stream which is NRZI encoded when written to disk. >>> A 1 bit represents a magnetic transition, and a 0 bit no transition. >>><end quote> >>> >>>I should know, I designed a multi standard floppy controller board, >>>and it works :-) >>>It has one of the lowest error rates in the universe, ZERO. >>>Want the diagram? >> >>I would like to replace the floppy interface in a TDS3034 DPO with some >>USB or Ethernet interface. > >Is the TDS3034 PC based? Open it up. Maybe there is some slot (PCMCIA, >mini-PCI or ISA) that will take a network card. I wish, it's 68k based :( I've not opened the thing up, but going by info on the 'net the internal interfaces are proprietary :( Plus the fact that a Hong Kong company offers the 10Mbps NIC module second-hand for USD800 plus shipping & insurance. Old gear... So replacing the floppy with some emulated device would by easy, at least that approach will work. Later and current models have a USB port instead of the floppy, but Tektronix have stated that there is not and will not be a USB replacement for the floppy on older instruments. Emulate a printer interface seems easy, but then convert each print data stream back to graphics image? Haven't looked how hard that is to do. Would be a non-invasive solution -- as I have this instrument on long term loan I'd like not to fiddle too much with it. Each time I want to 'snap' some images, I have to find some (s/h) floppies, format and test them, discard the 75% odd failures, and hope the survivor will last for a session... Grant. -- http://bugs.id.au/
From: Jamie on 28 Apr 2010 19:23 Archimedes' Lever wrote: > On Tue, 27 Apr 2010 20:09:44 -0400, Jamie > <jamie_ka1lpa_not_valid_after_ka1lpa_(a)charter.net> wrote: > > >>Archimedes' Lever wrote: >> >>>On Tue, 27 Apr 2010 08:27:41 -0400, Jamie >>><jamie_ka1lpa_not_valid_after_ka1lpa_(a)charter.net> wrote: >>> >>> >>> Set your clock right, dingledorf. >> >>Well, that would explain why my virus scanner has been going >>off a day early lately.. >> >> Thanks for the tip, window licker! >> > > > > You were originally told by the Thompson tard or Terrell tard. > > You were simply too much of a tard to have caught it. Well sorry,. Terrel is on my block list.. He's one that I have put out to pasture, because he won't do it himself.
From: Grant on 28 Apr 2010 21:02 On Thu, 29 Apr 2010 06:59:45 +1000, Grant <omg(a)grrr.id.au> wrote: >On Wed, 28 Apr 2010 17:44:20 GMT, nico(a)puntnl.niks (Nico Coesel) wrote: .... >I wish, it's 68k based :( I've not opened the thing up, but going by Oops, it's MPC680DC Power PC based, "The processor system contains a MPC680DC Power PC microprocessor that controls the entire instrument. The processor system also contains flash ROM, system RAM, and interfaces to communications modules, the parallel printer port, and the floppy disk drive". -- TDS3000 service manual. Service manual is to module level with no schematics :( Grant. -- http://bugs.id.au/
From: JosephKK on 29 Apr 2010 02:05
On Sat, 24 Apr 2010 21:53:36 -0500, "George Jefferson" <phreon111(a)gmail.com> wrote: >I have an old keyboard that uses floppy to hold its os. It takes about 3 >mins to fully load if that. Also the disk can become corrupt overtime. > >I was thinking of replacing the floppy with a ssd type of system. What I'm >thinking is possible is to "hijack" the floppy interface cable and simulate >a floppy disk but provide a faster system. Essentially emulating the floppy >disk protocol, which I imagine it uses some existing standard, but reading >off a ssd/eeprom. > >Am I on the right track? Here the biggest problem is probably getting the >protocol correct and the electronics would be rather simple? Probably can be >done with a pic and not much more... > Doable, yes. I doubt that you can improve speed without rebuilding the whole keyboard. To start with, the speed coming off the floppy is very limited. What is the floppy controller IC if any? The boot routines are based around floppy read physical performance and are basically just a track/sector/head block reader. |