Why did old PCs have key locks? [LGR Retrospective]



你可曾看過舊的電腦主機,然後好奇這個東西呢? 這就是主機鎖 這在1984至1994年,曾經是許多電腦的基本配備 除了加速按鈕,主機鎖就是哪些看了就知道 個人電腦年代久遠的象徵。 但這到底有什麼用?為什麼有這些鑰匙 他們為什麼不那麼普遍了呢? 若回答第一道問題,主機鎖當然就是如你所預料的 將電腦用鑰匙鎖上 如何運用這個機制完全取決於鎖的種類、和內部的線路 很多時候都是防止別人打開主機盒 防止別人使用鍵盤,或兩者兼施。 例如,LDR 的木紋486有一個鎖可以影響鍵盤的輸入 當你轉動鑰匙,主機板的一個跳線將會斷絕鏈接 因此電腦就不會再接收鍵盤的訊號 這當然沒辦法防止別人打開主機盒然後移除主機板與主機鎖的連接 但是這將有效防止許多平白的無知行為發生 但是這將有效防止許多平白的無知行為發生 但是對某些電腦卻不是這麼一回事 因為鑰匙鎖需要物理性的將一片金屬片插入,當被瑣上,可以防止主機盒被打開。 有時候這個也可以鎖死鍵盤,有時候可以瑣死硬盤的進入,也有時候 甚至防止電腦被啟動 但是防止鍵盤輸入以及鎖死主機盒似乎是最常見的用法 有關的鎖頭在1984年最為流行 IBM在他的5170型號上的電腦就用上了這個鎖頭 在1984年11月13日的電腦人雜誌 ( PC Magazine ) 就說有關的IBM PC AT 5170 是第一個真正讓主管在晚上安眠的系統 一個難以複製的圈形鑰將所有非鑰匙持有者拒絕在外 這在當時很重要因為原裝的IBM的PC以及XT是超級容易被打開。 你只需要鬆下背後的幾個螺絲就可以打開來胡鬧一天了。 而且還無法阻止任何人在任何時候使用有關電腦 因為當時並沒有所謂的密碼也沒有用戶賬號。這對商業用戶是一大難題。 所以IBM就尋求了芝加哥鑰匙公司去解決這個難題,他們要芝加哥公司的 特製並有專利的圓形鑰匙,一個很密集的圓形鑰匙 這種鑰匙常見於自動販賣機,彈球桌,以及保安系統。 這的確是只一個最簡單讓人安心的保安措施,而沒有實質的保安。 基本上只是防止一些你不想見到但又常見的錯誤發生。 但是對於商戶卻有用。 IBM也有提供這個個人電腦鎖的選項給PC以及XT的用戶,幾乎 是同一時間發布,但是卻有些不一樣的功能 這個鎖他卻不鎖死鍵盤輸入,而直接防止電腦被啟動。 這個鎖他卻不鎖死鍵盤輸入,而直接防止電腦被啟動。 和鑰匙機關連接的有一個臂手會勾著電腦的啟動裝置 當你轉這個鑰匙會控制電腦的電源輸入。 不僅如此,而且這個鎖還有一個鋼盒 這可以防止被打開,而且他還有一個連接電源線的鎖,所以可以防止別人拔開電源線 而自然的,IBM當時所做的,所有人都會跟隨 而鑰匙的時代就開拓了 不是所有的複製鎖都是那麼的堅固以及安全 而很多時候一把鑰匙可以打開 多家甚至不一樣款的電腦 也因為之前的原因,有時候他們用更常見的鑰匙而不是圓形鑰匙 雖然這個鑰匙可以更容易在五金店被複製,但是至少這個常見的鑰匙是獨一無二的。 而不幸的也意味著,如果不見了鑰匙,但是電腦已經被鎖上了 想要使用或打開你的電腦真的很蛋疼,而且並不是不常見的 很多時候有很多舊電腦有這個鎖卻並沒有鑰匙 其實鎖頭還有別的用處,就如這個 鎖死脈衝保護機器 不是鎖死電源開關, 而是直接鎖死你所有機器插電的機器 有一些國外的電腦例如SGI Indigo2就用一個有洞的金屬條 他的想法是防止打開主機盒,你將有洞金屬條在主機中間穿過 然後在另一邊用大鎖頭鎖上 而且以前還有一個選項是鎖死軟盤,雖然 這個使用一個較為奇怪且滑稽的鑰匙,鑰匙會在外面突出 最後,讓鑰匙絕技的原因其實是軟體 當然這只包括一般家用電腦而不是如特例的伺服器之類的 工作伺服器或特殊電腦之類的 BIOS裡面也開始加入密碼防止無授權的胡鬧更改 作業系統也開始加入賬戶以及密碼 資料加密也變得更常見,所以即使用戶 得以繞過微軟的差勁密碼檢查,敏感密碼以及文件還是可以得以保存 因著強大的計算法 而且家用電腦用戶很多時候都不想要有一個鎖 因為通常就只有他們或他們家人在用這些電腦 當然,筆記型電腦就不可以同一而喻 因為筆記型電腦的可移動性以及容易被盜 所以很多筆記型電腦還是有個物理鎖的選項,很多時候都是Kensington鎖,但是即使如此 這個鎖是需要額外購買而不是內置的。 而這就是電腦鎖的要旨 電腦鎖在當時有他的用處,並且在個人以及商業電腦上 用了多年,即使當時有很多人都不以為意 但是我還是很喜歡用這些東西,即使 這完全沒有邏輯可言 電腦鎖讓我感覺美好以及懷舊,就如按上加速鍵或者拿著軟盤 當然這很沒有用處,但是當我在用著有電腦鎖的電腦時 我都會玩弄一番 這個功能是很值得尋求,尤其是你 喜歡復古的電腦收藏,所以你想要得到更完整的體驗 一定要找這些鎖,當然也不要忘了記得找到鑰匙 如果你喜歡我這個電腦鎖的影片你也許會喜歡我加速鎖的影片! 那個影片的課題也很關係到這個影片,而且我覺得很有趣。 就如往常,感謝你觀看LGR的視屏!

20 thoughts on “Why did old PCs have key locks? [LGR Retrospective]

  1. Funny early password story: a friend was setting up her AOL account on her first home PC and having major problems with it accepting her password. After many calls to the AOL tech and learning how to delete and reload the AOL software, she called me in frustration. I had her walk me through what she was doing even though it would not go through since it was dial-up and we were on the only line she had. In frustration, he yelled, "there it goes again!!!" "what Connie?" Those DAMN little stars and NOT the word!" "You mean asterisks?" Connie: "Whatever". Me, "Connie it has taken your password, the asterisks shows in case someone is looking over your shoulder and would see that word and steal it, give it a try and call me back." Later Connie calls back, "It WORKED, you know more than AOL!"

  2. Some places where I worked just kept the extra key taped to the case in the back in case you lost the other one.

  3. I used to have a computer with such lock when I was a kid.
    I pretended to start the computer like a car.

    While taking a deep breath and pushing the Turbo Button: "Now's shit going to get real"

  4. I am young and I have questions: Why the heck nobody came up with a password earliler? And what does the turbo button do?

  5. 4:00 Don’t worry, just send it to LPL, he’ll pick it open in literally 5 seconds with his tubular key impressioning tool.

  6. Key locks also prevented the power from being turned OFF, which was useful when the computer was also a terminal on a network. Older networks were controlled from a single “host” (server), which “polled” one terminal at a time on a shared line. If a terminal had no transaction or data to send in, it would immediately respond with a short “NO” signal, and the next terminal could be polled. If a terminal lost power, the host would wait (usually 3 seconds) and after a certain number (usually 2) of retries, would remove that terminal from the polling list. This slowed down service on the other terminals sharing the line.

    So managers had an interest in not letting operators power DOWN their machines. Also, bootable floppy disks could be booted up to make changes in the data OR THE OS when power came back up, which could allow a user to change the system without authorization.

  7. I have heard that when they designed the panel for pdp-8, they needed some way to keep the plastic panel in place around the
    plastic switches they used for entering addresses and data in binary. Instead of using an ugly pair of screws they decided to put a power key switch on one side and a panel lock switch on the other side. This was copied by all there competitors in the early days such as Data General and so it almost was a requirement that a computer have a power key switch and front panel lock switch.

  8. "Schneier on Security" https://www.schneier.com/blog/archives/2019/05/locked_computer.html links to this vid! You're a reference for a security website! Congratulations!

  9. I remember these in schools in the 80s good times especially when the teacher would forget where he put the key 🔑

  10. Well this is wierd… the computers at my school have key locks and they are supposed to run Windows 8… (they run Windows 7 instead…)

  11. Fun fact: In one of our school bathrooms there's a TON of ancient PCs with key locks and 5.25 inch drives on top of the stalls. I don't know why they're there, but they are.

  12. I have repaired and programmed computers from the beginning of pc's. I think the key lock was to protect computers from random pilferage. Back in the day memory sticks and hard drives were very very expensive. An example might be a 100 MB hard drive may have cost $1000.00 or more , 512 KB memory sticks, $100.00 a piece.

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