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If your iPhone, iPad, or iPod touch won‘t turn on or is frozen

30/10/2017 Comments off

If your device has a frozen screen or doesn’t respond when you touch it, or becomes stuck when you turn it on, learn what to do.

If your screen is black or frozen

If your screen is black or frozen, you might need to force restart your device. A force restart won’t erase the content on your device. You can force restart your device even if the screen is black or the buttons aren’t responding. Follow these steps:

  • On an iPhone 8 or iPhone 8 Plus: Press and quickly release the Volume Up button. Then press and quickly release the Volume Down button. Finally, press and hold the Side button until you see the Apple logo.
  • On an iPhone 7 or iPhone 7 Plus: Press and hold both the Side and Volume Down buttons for at least 10 seconds, until you see the Apple logo.
  • On an iPhone 6s and earlier, iPad, or iPod touch: Press and hold both the Home and the Top (or Side) buttons for at least 10 seconds, until you see the Apple logo.

If your device still won’t turn on or start up

Plug in your device and let it charge for up to one hour.

After a few minutes, you should see the charging screen. 

 

If you don’t see the charging screen within an hour, or you see the connect to power screen, check the jack, USB cable, and power adapter. Make sure that everything is plugged in firmly, free of debris, and not damaged. You might want to try a different USB cable or power adapter.

If your device still doesn’t turn on, see what to do next.

If your device turns on but gets stuck during start up

If you see the Apple logo or a red or blue screen during startup, try these steps:

  1. Connect your device to a computer and open iTunes. If you don’t have a computer, try to borrow one, or go to an Apple Store or Apple Authorized Service Provider for help. 
  2. While your device is connected, force it to restart. 
    • On an iPhone 8 or iPhone 8 Plus: Press and quickly release the Volume Up button. Then press and quickly release the Volume Down button. Finally, press and hold the Side button until you see the recovery-mode screen.
    • On an iPhone 7 or iPhone 7 Plus: Press and hold the Side and Volume Down buttons at the same time. Keep holding them until you see the recovery-mode screen.
    • On an iPhone 6s and earlier, iPad, or iPod touch: Press and hold both the Home and the Top (or Side) buttons at the same time. Keep holding them until you see the recovery-mode screen.
  3. Don’t release the buttons when you see the Apple logo. Keep holding until you see the recovery mode screen.

 

  1. When you get the option to restore or update, choose Update. iTunes will try to reinstall iOS without erasing your data.

iTunes will download the software for your device. If it takes more than 15 minutes, your device will exit recovery mode and you’ll need to repeat steps 2 and 3.

 
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Categories: Constructeur, Matériel Tags: ,

macOS Boot Option Cheatsheet

16/10/2017 Comments off

To access some specialized Mac features you’ll need to hold down one or more keys during startup. If you’re having trouble with your Mac, this can be a great way to troubleshoot and analyze your options.

To use any of these boot keys, hold down the listed key combo as soon as you press your Mac’s power button. If you’re restarting your Mac, press and hold the keys immediately after your Mac begins to restart. Don’t release the keys until you see the described behavior.

Shift: Start your Mac in Safe Mode. Since safe mode only loads essential software, you can determine whether a system process or a user-installed application is causing your problem.

Option: Boot into Startup Manager. From here you can select different startup disks if any bootable partitions are available.

Command + R: Boot into Recovery Mode. Recovery Mode is macOS’s powerful recovery suite with a bunch of options for saving or wiping your Mac. You can use it to reinstall macOS, restore from a Time Machine backup or use Disk Utility to repair or format your hard drive.

Shift + Command + Option + R: Start in Internet Recovery Mode, skipping your system’s hard drive. This allows you to reinstall the build of macOS that came with your computer from the factory. macOS might do this one on its own if your installation is so messed up that you can’t boot into Recovery Mode.

Command + S: Start in single user, command-line-only mode. This is useful for running diagnostic Terminal commands or fsck, but it can’t do much beyond that.

Command + V: Boot in verbose mode. This mode displays logging and diagnostic messages as your Macboots. If your Mac is showing the Apple logo but failing to start completely, try this step to see where in the boot process the error occurs.

Lire la suite…

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macOS High Sierra Supplemental Update Released for Mac Users

06/10/2017 Comments off

Apple has released the first supplemental update to macOS High Sierra 10.13, complete with bug fixes, improvements, and security fixes.

General release notes accompanying the supplemental update suggests the release includes improvements to stability, reliability, and security. Specifically, the update is said to “improve installer robustness” (it is unclear if this addresses the issue where some users are unable to download a complete macOS High Sierra installer without third party utility assistance), includes a fix for cursor graphics bugs when using Adobe InDesign, and resolves and issue with Mail app was unable to delete email from Yahoo accounts. Additionally, the update includes a security fix to address a problem where Disk Utility could be used to reveal the password of an encrypted AFPS volume, and the update also resolves a security bug relating to Keychain passwords. Complete security update release notes are below for those interested. The supplemental update is recommended for all macOS High Sierra users to install.

Mac users running macOS 10.13 High Sierra can find the update available to download and install now in the Mac App Store Updates section. The update is labeled as “macOS High Sierra 10.13 Supplemental Update”.

Note the supplemental update is separate from the beta versions of 10.13.1 currently under the beta testing programs.

Always back up a Mac before installing any system software update, including smaller bug fix updates like this macOS High Sierra Supplemental Update.

The complete security related supplemental update release notes are as follows:

macOS High Sierra 10.13 Supplemental Update
Released October 5, 2017
StorageKit
Available for: macOS High Sierra 10.13
Impact: A local attacker may gain access to an encrypted APFS volume
Description: If a hint was set in Disk Utility when creating an APFS encrypted volume, the password was stored as the hint. This was addressed by clearing hint storage if the hint was the password, and by improving the logic for storing hints.
CVE-2017-7149: Matheus Mariano of Leet Tech
Security
Available for: macOS High Sierra 10.13
Impact: A malicious application can extract keychain passwords
Description: A method existed for applications to bypass the keychain access prompt with a synthetic click. This was addressed by requiring the user password when prompting for keychain access.
CVE-2017-7150: Patrick Wardle of Synack
New downloads of macOS High Sierra 10.13 include the security content of the macOS High Sierra 10.13 Supplemental Update.

Separately, iPhone and iPad users can find iOS 11.0.2 available as an update, which also includes various bug fixes for that system software release, and watchOS 4.0.1 for Apple Watch is out as well.

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Categories: Constructeur, Logiciel Tags: ,

How to Downgrade iOS 11 to iOS 10.3.3 on iPhone and iPad

06/10/2017 Comments off

Don’t like iOS 11 on your iPhone or iPad? You can downgrade to iOS 10.3.3 if you act quickly. Maybe you don’t like the update, maybe you find iOS 11 battery life to be poor, or app compatibility to be a problem, or perhaps you think the performance is subpar. Whatever the reason, you can easily downgrade iOS 11 if you need to, but the ability to downgrade is only available for a limited time while Apple continues to sign the prior operating system release of iOS 10.3.3.

We’ll walk through how you can downgrade iOS 11 back to iOS 10 on an iPhone or iPad.

This guide requires iTunes and a computer, internet access, an iOS 10.3.3 ISPW file, and a USB cable. There is no way to downgrade iOS 11 without iTunes and a computer.

Important note: downgrading iOS 11 to iOS 10.3.3 can cause data loss, including the removal of important data or everything on your iPhone or iPad. Thus it is critical to have a backup that is compatible with iOS 10 available before downgrading (one should have been made prior to updating to iOS 11 in the first place), this is because iOS 11 backups are not compatible with iOS 10 or other prior releases. If you only have a backup for iOS 11, then downgrading to iOS 10 may require you to update again to iOS 11 in order to restore from that iOS 11 backup. If you don’t know what you are doing and do not have adequate backups, do not attempt to downgrade or you may experience permanent data loss on the iPhone or iPad.

We’ll cover two ways to downgrade, a simple way that should work for most users, and an approach that requires Recovery Mode if the first downgrade method fails.

Lire la suite…

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How to Download a Full macOS High Sierra Installer App

04/10/2017 Comments off

Many Mac users who are attempting to download macOS High Sierra from the Mac App Store will find that a small 19 MB version of “Install macOS High Sierra.app” downloads to the /Applications folder of the target Mac, rather than the complete 5.2 GB Installer application for macOS High Sierra. This is annoying because it prevents a single download from being used on multiple computers, plus the small installer requires an internet connection during usage to download the rest of the High Sierra update files. Additionally, the tiny 19 MB incomplete installer prevents users from being able to create a macOS High Sierra USB installer drive or other custom update options available through the command line, like skipping the APFS update.

This tutorial will show you a workaround trick that allows Mac users to download the full macOS High Sierra “Install macOS High Sierra.app” file at 5.2 GB with the complete installer tool set and all dmg files and associated Install macOS High Sierra.app/Contents/Resources/ tools, rather than the tiny incomplete truncated installer at 19 MB.

How to Download the Full “Install macOS High Sierra.app” Application

Warning: this method relies on a third party tool from an unverified third party source, if you are not comfortable with using unvetted and unverified software, and if you do not understand the risks associated with using potentially dubious software, do not follow this process. This is for advanced users only.

    1. Go to dosdude1.com here and download the High Sierra patcher application*
    2. Launch “MacOS High Sierra Patcher” and ignore everything about patching, instead pull down the “Tools” menu and choose “Download MacOS High Sierra”

    1. Confirm that you want to download the complete macOS High Sierra install application, and then point it to a location to save on the local hard drive

    1. The patcher app will notify you when the download is complete, when it is done downloading quit out of the patcher app

    1. Locate the “Install macOS High Sierra.app” file you downloaded, it will be the complete installer application with the full Contents/Resources/ toolkit available

* The “macOS High Sierra Patcher” application is intended for those with unsupported Macs and Hackintosh users, but any Mac user can use the app to be able to download the complete installer file from Apple servers. The source of this patcher application is a MacRumors Forums

You can confirm that you have the complete Install macOS High Sierra.app application by getting info on the file, the complete installer should be around 5.2 GB rather than the tiny 19 MB incomplete installer that requires additional downloads.

The complete macOS High Sierra installer downloaded

Why do some users get a small incomplete version of macOS High Sierra installer from the App Store?

This is not yet known, but it happens with the final version of macOS High Sierra installer as well as with some of the beta versions.

It is unclear why some users will get a 19MB version of “Install macOS High Sierra.app” when downloaded from the App Store, while others users will get the complete 5.2GB version of “Install macOS High Sierra.app” when downloading from the App Store. Interestingly, once a user ends up with the 19 MB version of the incomplete installer, that seems to be the only thing that will download for that user regardless of how many times the incomplete installer app is deleted and re downloaded.

Incomplete macOS High Sierra installer

The installer size and completeness inconsistency appears random, and has no relation to disk space, beta enrollment, software catalog, and other theories seem to be incorrect as well.

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How to Disable or Enable Auto-Brightness in iOS 11 for iPhone and iPad

04/10/2017 Comments off

Auto-Brightness is a screen setting on the iPhone and iPad which causes the device to automatically adjust the display brightness depending on ambient lighting conditions. For example, if you’re outdoors or in bright lighting, the screen would adjust to be brighter so that it is more visible, and if you’re in a dim room or outdoors at night, the screen would adjust to lower the brightness so that the screen isn’t as glaringly bright. Auto-brightness in iOS also can improve battery life by adjusting the brightness of the iPhone or iPad display down as the ambient lighting permits.

Lire la suite…

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Categories: Constructeur, Logiciel Tags: ,

How to Run MacOS Sierra in a Virtual Machine for Free, the Easy Way

15/04/2017 Comments off

Run Mac OS in Virtual Machine on a Mac

Advanced Mac users may find it useful to run macOS or Mac OS X in a virtual machine atop their existing Mac operating system. Creating a virtual machine for Mac OS is now easier than ever before, and we’ll show you how to set up easy Mac virtual machines on a Mac.

For some quick background, virtualization allows you to run another operating system in a confined virtual machine atop an existing operating system through an application layer. This means there is no disk partitioning involved, the virtualized operating system runs just like any other application on your computer. We have covered this broad topic many times before for purposes like running Windows 10 on a Mac with a VM, to running Ubuntu Linux in VirtualBox, to Snow Leopard in a VM, and others. In the guide here, we will be creating a Macintosh virtual machine for running Mac OS on top of Mac OS, which can be helpful for testing out different apps and operating system versions, amongst other purposes.

Lire la suite…

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How to create a bootable macOS Sierra installer drive

31/03/2017 Comments off

Apple uses its App Store to distribute its software, like new Mac operating systems. It’s convenient, but sometimes it can take a while for a download to finish. And if you have multiple Macs, it’s inefficient to download the new OS to each and every Mac.

sierra external icon

That’s why I like to make a bootable external drive for the sole purpose of installing the Mac operating system. When I need to tend to a bunch of Macs, it’s much faster to use a bootable drive instead of going to each Mac, launching the App Store, searching for the operating system, downloading it (after entering my Apple ID), and then running the installer.

You can create a bootable USB flash drive with the macOS Sierra installer that’s now available. The installer software will take up nearly 5GB of storage space. Here’s how to create a bootable macOS Sierra installer drive.

Macworld also has bootable-install-drive instructions for El Capitan (OS X 10.11), Yosemite (OS X 10.10), Mavericks (OS X 10.9), Mountain Lion (OS X 10.8), and Lion (OS X 10.7).

Download the macOS Sierra installer

Launch the App Store app, then look for macOS Sierra in the store. (Here’s a link.) Click on the Download button, and your Mac will download the installer to your Applications folder. If it automatically launches after download, quit the installer.

sierra beta installer app folder sierra gm
Keep the installer in the Applications folder.

If you’ve already upgraded your Mac to Sierra, the installer is removed from the Applications folder. You can download it again if you go to Purchased in the App Store. Look for macOS Sierra in the list of apps that you’ve bought, and click on the Download button. If it automatically launches after download, quit the installer.

Lire la suite…

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HP-41C Synthetic Programming

23/11/2016 Comments off

Caution

Many of these instructions were intentionally left out because used incorrectly they can confuse the calculator and cause either a lockup or a « Memory Lost » state. (If you get into the former state, you may need to remove the batteries to reset the calculator.)

You should backup anything important before first engaging in Synthetic Programming.

How Synthetic Instructions Work

HP-41 instructions are one or more bytes long. The calculator will only allow certain sequences, but with the tool below, you’ll be able create new sequences by entering code that the calculator allows and then grabbing bytes out of this code to create different instructions. These new sequences allow access to additional characters, additional sounds, more alpha editing commands, easy control of the calculator through direct access to system registers, etc. They make it possible to do new things and to reduce the size and execution time of programs. The byte grabber described below will allow you to remove individual bytes from programs you create so the the bytes that remain are interpreted differently.

Creating a Byte Grabber

You can use the following steps to create a Byte Grabber. Make sure to follow the steps exactly. If it doesn’t work the first time, try again. Note that the first step is a master clear so save anything important to cards, tape, or disk now!

  1. Remove any accessory modules.
  2. Do a Master clear by holding down the backspace key while turning on the calculator. The Display will show MEMORY LOST.
  3. Assign « + » to the LN key by pressing shift ASN ALPHA shift + ALPHA LN.
  4. Assign « DEL » to the LOG key by pressing shift ASN ALPHA D E L ALPHA LOG.
  5. Press PRGM to witch to program mode. The display should show 00 REG 45.
  6. Start catalog 1 by pressing shift CATALOG 1 and press R/S immediately before the display blinks. If the display blinks, you waited too long. Repeat this step as many times as necessary to get the R/S pressed before the display blinks. (The display will show the .END. instruction both before and after the blink, but you must press R/S before the blink.)
  7. Press the ALPHA key to go into Alpha mode.
  8. Press the backspace key. The display should now show 4094 RCL 01.
  9. Press ALPHA to leave Alpha mode.
  10. Press shift GTO .005 and you should see 05 LBL 03.
  11. Press USER (if necessary) to enter User mode.
  12. Press LOG 003 which uses the assignment you made earlier to DEL 3 steps. You should now see 04 STO 01.
  13. Press ALPHA to go back into Alpha mode.
  14. Press ? A A A A A A (Everything after the first A will probably display as « -« s.) Press exactly 6 A’s!
  15. Press PRGM to leave program mode and ALPHA to leave Alpha mode.
  16. Press shift GTO . . (press both dots)

The byte grabber should now be assigned to the LN key. Press AND HOLD the LN key which should display XROM 28,63. Keep holding the key until the calculator displays NULL because you don’t want to execute the byte grabber now. This would be a good time to save the calculator’s status on a card by pressing XEQ ALPHA W S T S ALPHA in case you accidentally destroy the byte grabber later.

Be careful in using the byte grabber. You may get a « MEMORY LOST » or lock the calculator if you use it incorrectly. If the latter happens, remove the batteries for a few seconds and return them. If that doesn’t work, try turning the calculator on a few times with the batteries out or leave them out for several hours. Lire la suite…

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Digital Equipment Corporation PDP-12

23/02/2016 Comments off

The PDP-12 was a 12 bit machine introduced in 1969. It sold for $27,900. The PDP-12 was designed as a successor to the LINC-8 and was compatible with LINC-8 software.

DEC.PDP-12.1963.102646098

Programmed Data Processor (PDP) was a series of minicomputers made and marketed by the Digital Equipment Corporationfrom 1957 to 1990. The name « PDP » intentionally avoided the use of the term « computer » because, at the time of the first PDPs, computers had a reputation of being large, complicated, and expensive machines, and the venture capitalists behind Digital (especially Georges Doriot) would not support Digital’s attempting to build a « computer »; the word « minicomputer » had not yet been coined.[citation needed] So instead, Digital used their existing line of logic modules to build a Programmed Data Processor and aimed it at a market that could not afford the larger computers.

The various PDP machines can generally be grouped into families based on word length.

Members of the PDP series include:

PDP-1

The original PDP, an 18-bit machine used in early time-sharing operating system work, and prominent in MIT’s early hacker culture, which was to lead to the (Massachusetts) Route 128 hardware startup belt (DEC’s second home, Prime Computer, etc.). What is believed to be the first video game, Spacewar!, was developed for this machine, along with the first known word processing program for a general-purpose computer, « Expensive Typewriter ».

PDP-2

A number reserved for an unbuilt, undesigned 24-bit design.

PDP-3

First DEC-designed (for US « black budget » outfits) 36-bit machine, though DEC did not offer it as a product. The only PDP-3 was built by the CIA’s Scientific Engineering Institute (SEI) in Waltham, MA to process radar cross section data for the Lockheed A-12 reconnaissance aircraft in 1960.[1][2] Architecturally it was essentially a PDP-1 controlling[citation needed] a PDP-1 stretched to 36-bit word width.[3]

PDP-4

pdp4

PDP-4

18-bit machine intended to be a slower, cheaper alternative to the PDP-1; it was not considered commercially successful. All later 18-bit PDP machines (7, 9 and 15) were based on a similar, but enlarged instruction set, more powerful, but based on the same concepts as the 12-bit PDP-5/PDP-8 series. One customer of these early PDP machines was Atomic Energy of Canada. The installation at Chalk River, Ontario included an early PDP-4 with a display system and a new PDP-5 as interface to the research reactor instrumentation and control.

PDP-5

DEC’s first 12-bit machine. Introduced the instruction set later expanded, in the PDP-8, to handle more bit rotations and to increase the maximum memory size from 4K words to 32K words. It was the first computer series with more than 1,000, then 10,000 built, which was a large number in the decade after ENIAC/UNIVAC builders predicted that 3 computers would serve the nations computing needs.

PDP-6

pdp6

PDP-6

36-bit timesharing machine. Very elegant architecture; introduced the instruction set later used in the PDP-10 and DECSYSTEM-20. It was considered by its detractors a large minicomputer or, by DEC fans especially, Big Iron – a mainframe As a timesharing machine, it constantly outran the batch-oriented IBM System/360 and even IBM System/370-series mainframes.

PDP-7

pdp7

PDP-7

Replacement for the PDP-4; DEC’s first wire-wrapped machine. The first version of Unix, and the first version of B, a predecessor of C, were written for this machine at Bell Labs, as was the first version (by DEC) of MUMPS.

 

 

 

 

 

 

PDP-8

R00000254-hp

PDP-8

12-bit machine with a tiny instruction set; DEC’s first major commercial success and the start of the minicomputer revolution. Many were purchased (at discount prices, a DEC tradition, which also included free manuals for anyone who asked during the Ken Olsen years) by schools, university departments, and research laboratories. Later models were also used in the DECmate word processor and the VT-78 workstation. It is reported that Edson de Castro, who had been a key member of the design team, left to form Data General when his design for a 16-bit successor to the PDP-8 was rejected in favour of the PDP-11; the « PDP-X » did not resemble the Data General Nova,[4] although that is a common myth.

LINC-8

A hybrid of the LINC and PDP-8 computers; two instruction sets. Progenitor of the PDP-12.

PDP-9

Successor to the PDP-7; DEC’s first micro-programmed machine. It featured a speed increase of approximately twice that of the PDP-7. The PDP-9 was also one of the first small or medium scale computers to have a keyboard monitor system based on DIGITAL’s own small magnetic tape units (DECtape).[5] The PDP-9 established minicomputers as the leading edge of the computer industry.

PDP-10

36-bit timesharing machine, and fairly successful over several different models. The instruction set was a slightly elaborated form of that of the PDP-6.

PDP-11

11_panel_2

PDP-11

PanelInCase_Side

PDP-11/70

The archetypal minicomputer; a 16-bit machine and another commercial success for DEC. The LSI-11 was a four-chip PDP-11 used primarily for embedded systems. The 32-bit VAX series was descended from the PDP-11, and early VAX models had a PDP-11 compatibility mode. The 16-bit PDP-11 instruction set has been very influential, with processors ranging from the Motorola 68000 to the Renesas H8 and Texas Instruments MSP430, inspired by its highly orthogonal, general-register oriented instruction set and rich addressing modes. The PDP-11 family was extremely long-lived, spanning 20 years and many different implementations and technologies.

PDP-12

PDP-12

PDP-12

MINOLTA DIGITAL CAMERA

Descendant of the LINC-8; with slight redesign, and different livery, officially followed by, and marketed as, the « Lab-8 ». See LINC and PDP-12 User Manual.

PDP-13

Designation was not used, apparently due to superstition.

PDP-14

A machine with 12-bit instructions, intended as an industrial controller (PLC). It had no data memory or data registers; instructions could test Boolean input signals, set or clear Boolean output signals, jump conditional or unconditionally, or call a subroutine. Later versions (for example, the PDP-14/30) were based on PDP-8 physical packaging technology. I/O was line voltage.

PDP-15

PDP-15

PDP-15

DEC’s final 18-bit machine. It was its only 18-bit machine constructed from TTL integrated circuits rather than discrete transistors, and, like every DEC 18-bit system (except mandatory on the PDP-1, absent on the PDP-4) had an optional integrated vector graphics terminal, DEC’s first improvement on its early-designed 34n where n equalled the PDP’s number. Later versions of the PDP-15 ran a real-time multi-user OS called « XVM ». The final model, the PDP-15/76 used a small PDP-11 to allow Unichannel peripherals to be used.

PDP-16

PDP-16/M

PDP-16/M

A « roll-your-own » sort of computer using Register Transfer Modules, mainly intended for industrial control systems with more capability than the PDP-14. The PDP-16/M was introduced as a standard version of the PDP-16.

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