Author Archives: gmcdavid

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About gmcdavid

Retired IT professional with a wide range of interests. Married. Three sons, two with autistic-spectrum disorders and the third being transgender with Ehlers-Danlos syndrome. From Chicago but now living in the Twin Cities metro, Minnesota. Episcopalian. Carleton College (BA 1972, physics) and Stanford University (MS 1974, Applied Physics; MS 1976 Statistics).

Installing Slackware 15.0

Back in February I looked at the Slackware Linux web site. After years of working with Ubuntu, and occasionally its parent Debian, I decided to see if I could install Slackware and get it to work. I used it a lot in the first years of the current century. Could I still manage it now, or had the comforts of the Ubuntu installation process dulled my edge? From Slackware 15 – The old brigade:

Slackware is deployed using an ncurses interface, with a set of menus where you must make intelligent choices, including partitioning and package selection. And then, there’s LILO the bootloader. Not GRUB, mind! Feels a bit daunting, but then, if you’re careful and methodical, there should be no issues. That said, the approach automatically precludes Slackware from being a typical desktop choice, as most people would have no idea what to do with the installer.

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Rang Gaeilge, 30ú lá na Márta 2022

Duinnín agus Imleacán Kali

Dineen and the navel of Kali

Nodlaig, -lag, pl. -i, f. , oft. with art … .
N. mhaith chughat, I wish you a merry Christmas…

  • Seachtain roimh Nollaig. An aimsir an-mhíthaitneamhach ar
    fad. Gálaí gaoithe, ráigeanna baistí, flichshneachta. An Duinnineach
    ar a bhealach isteach go hEaglais na mBráithre Bána. Bhí
    sé thart ar a haon agus ba léir go leanfadh an lá anfach, fliuch. I
    halla mór na hEaglaise, bhí go leor pramanna, báibíní ina gcodladh iontu,
    teachtaireachtaí carntha orthu. Bhí daoine, mná don
    chuid is mó de, ag rith isteach chun faoistine nó ag lasadh
    coinnle: ullmhú i gcomhair na Nollag faoi lán tseoil.

    Week before Christmas. The weather was thoroughly unpleasant. Gales of wind,
    sudden outbreaks of rain, sleet. Dineen was on his way to the WhiteFriars’ church.
    It was about one and it was clear that the rainy, wet day would continue.
    In the great hall of the Church, there were many prams, babies sleeping in them,
    messages piled on them. There were people, mostly women, running in to confession or lighting up candles: preparation for Christmas in full swing[sail].

    míthaitneamhach Displeasing, disagreeable; unpleasant, unattractive
    ráig udden rush; sudden outbreak; fit, bout, attack f pl ráigeanna
    flichshneachta sleet m
    anfach Stormy, rough, tempestuous
    teachtaireacht message f
    carn heap, pile v
    faoistin confession f
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Rang Gaeilge, 23ú lá Mí Feabhra 2022

Duinnín i Ráth Maonais (tuilleadh)

  • ‘Rachaidh mé féin anseo isteach, ‘arsa an Duinníneach nuair
    a shroicheadar an eaglais. ‘Ba mhaith liom cúpla focal a bheith
    agam le Tom Merrigan.’

    Tharla cruinniú coiste de chuid bhuanchoiste an aonaigh
    saothair ar siúl ar ardán an halla nuair a bhuail an Duinníneach
    isteach agus bhí an tAthair Merrigan ag déanamh eadrána idir
    seastán na gcístí agus lucht roth an áidh. Chuir sé na mná uaisle
    ar fad in aithne don Duinníneach, a gheall go dtiocfadh sé chun
    aonaigh agus go gceannódh sé stocaí bána cniotáilte uathu dá
    mbeidís ar fáil. D’éalaigh siad on gcruinniú ansin agus shiúil
    siad thart ar an halla, idir na stainníní, agus iad ag caint.

    ‘I’ll go in here myself,’ said Dineen when they reached the church.
    ‘I would like to have a few words with Tom Merrigan.’

    A meeting of the standing committee of the job fair was taking place on the hall stage
    when Dineen came in and Father Merrigan was mediating between the cake stand and
    the wheel of fortune. He introduced all the ladies to Dineen, who promised to come to the
    fair and buy white knitted socks from them if available. They then escaped from the meeting and walked around the hall, between the booths, talking.

    coiste jury, committee m
    buanchoiste Standing committee m
    ardán platform, stage, stand m
    eadráin Separation of combatants; intervention in dispute; mediation, conciliation f gs eadrána
    seastán stand m
    roth wheel n
    ádh luck m gs áidh
    lucht Content, charge; fill, capacity; cargo, load;
    Class, category, of) people
    m
    geall pledge, security m
    stainnín Stand, stall, booth m
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    More about Zoom under Windows

    As I wrote in September, my HP EliteDesk 705 G2 SFF desktop with an AMD PRO A4-8350B R5 processor was giving me messages about limited computer resources when using Zoom under Windows 10, though not under Linux. These sitll occur, even though I have added memory, taking it from 8GB to 24GB. This last time, I finally remembered to bring up Task Manager. It showed me that there was no memory problem, but that Zoom was using a lot of CPU. Why this occurs with Windows but not Linux is puzzling. For now I will have to have all of my Zoom sessions on that system under Linux rather than Windows.

    More Storage Upgrades

    I got a new 1TB SSD drive for Christmas. I used it to replace the 512GB drive that I had installed on my HP EliteDesk 705 G2 SFF system. That 512GB drive in turn went back to the old laptop I had taken it from. In both cases the copying was done by Macrium Reflect Free. There were no problems at all with the HP desktop, but the laptop refused to boot afterwards. So I got out my Linux USB boot repair stick and booted from that, ran the boot repair utility and everything was fine. Both Windows 10 and Ubuntu Linux 20.04 booted cleanly.

    So I now have two extra 256GB SSD drives. Don’t really know what I will do with them. For now they are mounted in enclosures with USD 3.x connections.

    A web site that time forgot

    Many years ago I used Slackware Linux. I switched to Ubuntu because I was concerned that Slackware seemed to be essentially a one man show, and that seemed like a single point of failure. But Slackware was good to me, and I have not forgotten it. Recently Slackware came out with a new and up to date release and I am looking at it again.

    The web site looks much like what I remember from 15-20 years ago. That is OK with me, although I would like to see some more current content. I decided to download the Slackware book in its pdf form. Firefox just hung when I went to that page. However, I noticed that it was an ftp site, not http. 20 years ago I was accustomed to accessing ftp sites using ftp tools, not web browsers. So I guessed that this was what once known as an anonymous ftp site, and that such sites could be accessed with the ftp command line. Feeling like Gandalf recalling a thousand year old spell, I opened a Linux terminal window and proceeded to type:

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    Capricon Notes

    As I wrote previously , Mia (my wife) and I spent last weekend at Capricon, a Chicagoland science fiction convention. We went to most of the Capricons in the ’80’s and ’90’s, but in our first years in Minnesota the pressures of parenthood prevented us from going. Those have eased somewhat and we have been to most of the Capricons (and Windycons) since 2009. While most Capricons have been in the Chicago suburbs, this year the convention was downtown, at the Sheraton Grand Hotel.

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    Chicago again

    Mia (my wife) and I spent last weekend in Chicago for the Capricon, another science fiction convention that has been part of our life for decades. This year the convention was downtown, at the Sheraton Grand Hotel. Our room was on north side of the 28th floor and the view from our window was magnificent by night and day:

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    Rang Gaeilge, 26ú lá mí na Eanáir 2022

    Duinnín i Ráth Maonais (tuilleadh)

    Also Duinnín i Ráth Maonais

    • ‘Charlotte Lehane a d’aimsigh an corpan, a Athair.’
      ‘Mar sin é, a Sheosaimh?’
      ‘Níorbh fhéidir lei – deir sí – ligint dá comharsa an séú
      haithne a bhriseadh os comhair an tsaoil gan comhairle a leasa a
      chur uirthi. Ní túisce X imithe nár gur thrasnaigh Charlotte an
      bóthar. Chnag sí ar an doras – tá a méarlorg ar an gcnagaire.
      Nuair nach bhfuair sí freagra thuig sí go raibh náire ar an
      bpeacach roimpi. Chuaigh sí thart ar chúl an tí, grásta Dé á
      spreagadh, a deir sí. Bhí a fhios aici cá mbeadh eochair an
      chúldorais. Bhíodh sí mór le Nellie gur éirigh eatarthu i ngeall
      ar John Pinkerton. Isteach lei sa chistin. Bhí Nellie ar an urlar
      roimpi, marbh más fior.’

      ‘Charlotte Lehane found the body, Father.’
      ‘So that’s it, Joseph?’
      ‘She couldn’t – she says – allow her neighbor to break the sixth commandment in front of the world without giving her advice for her well-being. No sooner had X gone than Charlotte crossed the road. She knocked on the door – her fingerprint is on the knocker. When she did not receive an answer, she understood that the sinner before her was ashamed. She walked around the back of the house, inspired by God’s grace, she says. She knew where the back door key would be. She was friendly with Nellie until they quarreled on account of John Pinkerton. Into the kitchen. Nellie was on the floor
      before her, dead as it were.’

      ligint
      comharsa neighbor f
      séú sixth m
      aithne acquaintance, commandment f
      comhairle Advice, counsel; direction, influence f
      leas Good, well-being, benefit, interest m gs leasa
      túisce
      trasnaigh Cross; traverse, intersect; Contradict; interrupt, heckle; interfere
      náire shame f
      peacach sinner m
      grásta grace m
      spreag Urge, incite; arouse, inspire; prompt, encourage
      i ngeall in pledge
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    Black Hole Lifetimes

    Black holes are not totally black! They will evaporate by Hawking radiation. This is required by Thermodynamics and Quantum Mechanics. All properties of a Schwarzschild black hole are determined by its mass, so if you know the mass the lifetime and other properties follow automatically. Or you can start with the lifetime and determine the initial mass. Or the Schwarzschild radius, or the temperature, or the entropy, etc. For black holes comparable in mass to “normal” astronomical objects this lifetime is much longer than the current age of the universe. Viktor Toth’s Hawking radiation calculator is a convenient tool for such calculations. Here are some results:

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