Jihad needs scientists
in [Design]
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From: nonsense on 10 Mar 2007 13:05 Ken Smith wrote: > In article <esu5o4$8ss_003(a)s861.apx1.sbo.ma.dialup.rcn.com>, > <jmfbahciv(a)aol.com> wrote: > >>In article <esrr8b$n5i$2(a)blue.rahul.net>, >> kensmith(a)green.rahul.net (Ken Smith) wrote: > > [....] > >>>>These used to be called private packs. The concept has existed since >>>>the 60s. >>> > [....] > >>> The operator allocated them >>>after you paid large amounts of money. >> >>That depended on the site. You seem to be talking from an IBM >>operational POV. > > > Yes, an IBM environment > > >> Ours was designed differently. It was easy >>to redirect any spooling to a pack reserved for that purpose. >>Video downloads, etc. could be in a similar category. > > > Who did the "reserved for that purpose"? That would be the point where > money would be needed. > > [....] > >>>Where you evolve to depends a lot on where you start. In this case, there >>>is a large factor from the seemingly unimportant choices made in the early >>>days. >> >>Those weren't unimportant choices. They were deliberately made with >>certain goals and non-goals in mind. No development was an >>accident. > > > Sure it was. In both hardware and software design there are often choices > that look identical today but won't in the future. For a long time logic > has run on 5V. The selection of 5V can be traced in part to the heater > voltage on tubes. That's not true. Most of the vacuum tubes use(d) 6 volts and upwards. Check out the number of 5V tubes compared to the 6 volt ones. http://www.vacuumtube.com/FAQ.htm
From: nonsense on 10 Mar 2007 15:36 Ken Smith wrote: > In article <esu74a$8qk_001(a)s861.apx1.sbo.ma.dialup.rcn.com>, > <jmfbahciv(a)aol.com> wrote: massive snip >>I was never aware that the purpose of IRGs was so a human could >>edit directly to the tape. > > > We are not talking about humans doing things we are talking about what > computers could do. > > >>Yes! THat is the only way to get a directory of the tape. > > > Then as I have explained, the method works the checksum did not need to be > wrong. BAH is right. You run a checksum of the tape. You write the checksum to the tape. The checksum of the tape has changed and is therefore now incorrect. Every time you change the checksum data, the checksum changes. There's no way around it, other than putting a listing with the correct tape checksum on some other media. Printing a label with the checksum and sticking it to the reel would have worked, but that probably wasn't geeky enough a solution.
From: MassiveProng on 10 Mar 2007 15:57 On Sat, 10 Mar 2007 14:36:46 -0600, "nonsense(a)unsettled.com" <nonsense(a)unsettled.com> Gave us: >The checksum of the tape has changed and is therefore now incorrect. >Every time you change the checksum data, the checksum changes. The checksum test tests the body of data on the tape, and does NOT include the added checksum at the end, you idiotic, devoid of logic twit.
From: Ken Smith on 10 Mar 2007 15:58 In article <b6a74$45f2f36e$4fe72af$20401(a)DIALUPUSA.NET>, nonsense(a)unsettled.com <nonsense(a)unsettled.com> wrote: >Ken Smith wrote: >> In article <esu5o4$8ss_003(a)s861.apx1.sbo.ma.dialup.rcn.com>, >> <jmfbahciv(a)aol.com> wrote: >> >>>In article <esrr8b$n5i$2(a)blue.rahul.net>, >>> kensmith(a)green.rahul.net (Ken Smith) wrote: >> >> [....] >> >>>>>These used to be called private packs. The concept has existed since >>>>>the 60s. >>>> >> [....] >> >>>> The operator allocated them >>>>after you paid large amounts of money. >>> >>>That depended on the site. You seem to be talking from an IBM >>>operational POV. >> >> >> Yes, an IBM environment >> >> >>> Ours was designed differently. It was easy >>>to redirect any spooling to a pack reserved for that purpose. >>>Video downloads, etc. could be in a similar category. >> >> >> Who did the "reserved for that purpose"? That would be the point where >> money would be needed. >> >> [....] >> >>>>Where you evolve to depends a lot on where you start. In this case, there >>>>is a large factor from the seemingly unimportant choices made in the early >>>>days. >>> >>>Those weren't unimportant choices. They were deliberately made with >>>certain goals and non-goals in mind. No development was an >>>accident. >> >> >> Sure it was. In both hardware and software design there are often choices >> that look identical today but won't in the future. For a long time logic >> has run on 5V. The selection of 5V can be traced in part to the heater >> voltage on tubes. > >That's not true. Most of the vacuum tubes use(d) 6 volts and upwards. Yes, it is true. The heater voltage on many tubes was 6.3VAC. I'll leave the *sqrt(2) and the headroom numbers for you to go find. When you get done, you will see why 5V was the nearest round number. -- -- kensmith(a)rahul.net forging knowledge
From: nonsense on 10 Mar 2007 16:05
Ken Smith wrote: > In article <b6a74$45f2f36e$4fe72af$20401(a)DIALUPUSA.NET>, > nonsense(a)unsettled.com <nonsense(a)unsettled.com> wrote: > >>Ken Smith wrote: >> >>>In article <esu5o4$8ss_003(a)s861.apx1.sbo.ma.dialup.rcn.com>, >>> <jmfbahciv(a)aol.com> wrote: >>> >>> >>>>In article <esrr8b$n5i$2(a)blue.rahul.net>, >>>> kensmith(a)green.rahul.net (Ken Smith) wrote: >>> >>>[....] >>> >>> >>>>>>These used to be called private packs. The concept has existed since >>>>>>the 60s. >>>>> >>>[....] >>> >>> >>>>>The operator allocated them >>>>>after you paid large amounts of money. >>>> >>>>That depended on the site. You seem to be talking from an IBM >>>>operational POV. >>> >>> >>>Yes, an IBM environment >>> >>> >>> >>>>Ours was designed differently. It was easy >>>>to redirect any spooling to a pack reserved for that purpose. >>>>Video downloads, etc. could be in a similar category. >>> >>> >>>Who did the "reserved for that purpose"? That would be the point where >>>money would be needed. >>> >>>[....] >>> >>> >>>>>Where you evolve to depends a lot on where you start. In this case, there >>>>>is a large factor from the seemingly unimportant choices made in the early >>>>>days. >>>> >>>>Those weren't unimportant choices. They were deliberately made with >>>>certain goals and non-goals in mind. No development was an >>>>accident. >>> >>> >>>Sure it was. In both hardware and software design there are often choices >>>that look identical today but won't in the future. For a long time logic >>>has run on 5V. The selection of 5V can be traced in part to the heater >>>voltage on tubes. >> >>That's not true. Most of the vacuum tubes use(d) 6 volts and upwards. > > > Yes, it is true. The heater voltage on many tubes was 6.3VAC. I'll leave > the *sqrt(2) and the headroom numbers for you to go find. When you get > done, you will see why 5V was the nearest round number. 6.3 * .707 = 4.45 making 4 volts the nearest round number. |