Mac OS X 10.5 Leopard

System requirements

Apple states the following basic Leopard system requirements, although, for some specific applications and features (such as iChat backdrops) an Intel processor is required:

Processor: any Intel processor, or PowerPC G5 or G4 (867 MHz and faster) processor

Optical drive: internal or external DVD drive (for installation of the operating system)

Memory: minimum 512 MB of RAM (additional RAM (1 GB) is recommended for development purposes)

Hard drive capacity: Minimum 9 GB of disk space available.

Leopard’s retail version was not released in separate versions for each type of processor, but instead consisted of one universal release that could run on both PowerPC and Intel processors. However, the install discs that ship with Intel-based Macs only contain Intel binaries.

Processor type and speed are checked during installation and installation halted if insufficient; however, Leopard will run on slower G4 processor machines (e.g., a 733 MHz Quicksilver) if the installation is performed on a supported Mac and its hard drive then moved to a slower/unsupported one (the drive may either be an internal mechanism or a Firewire external).

Mac OS X 10.4 Tiger

Mac OS X Tiger (version 10.4) is the fifth major release of Mac OS X (now named macOS), Apple's desktop and server operating system for Mac computers. Tiger was released to the public on April 29, 2005 for US $129.95 as the successor to Mac OS X 10.3 Panther. Some of the new features included a fast searching system called Spotlight, a new version of the Safari web browser, Dashboard, a new 'Unified' theme, and improved support for 64-bit addressing on Power Mac G5s. Mac OS X 10.4 Tiger shocked executives at Microsoft by offering a number of features, such as fast file searching and improved graphics processing, that Microsoft had spent several years struggling to add to Windows with acceptable performance.

Mac OS X 10.3 Panther

Mac OS X Panther (version 10.3) is the fourth major release of Mac OS X (now named macOS), Apple’s desktop and server operating system. It followed Mac OS X 10.2 and preceded Mac OS X Tiger. Apple released Panther on October 24, 2003.

Macintosh Plus

The Macintosh Plus computer is the third model in the Macintosh line, introduced on January 16, 1986, two years after the original Macintosh and a little more than a year after the Macintosh 512K, with a price tag of US$2599. As an evolutionary improvement over the 512K, it shipped with 1 MB of RAM standard, expandable to 4 MB, and an external SCSI peripheral bus, among smaller improvements. Originally, the computer's case was the same beige color as the original Macintosh, Pantone 453,[2] however in 1987, the case color was changed to the long-lived, warm gray "Platinum" color. It is the earliest Macintosh model able to run System 7.

Ampex Model 227

have touched.

unix time

Unix time (also known as Epoch time, POSIX time, seconds since the Epoch, or UNIX Epoch time) is a system for describing a point in time. It is the number of secondsthat have elapsed since the Unix epoch, minus leap seconds; the Unix epoch is 00:00:00 UTC on 1 January 1970 (an arbitrary date); leap seconds are ignored, with a leap second having the same Unix time as the second before it, and every day is treated as if it contains exactly 86400 seconds.[2] Due to this treatment Unix time is not a true representation of UTC.

Unix time is widely used in operating systems and file formats. In Unix-like operating systems, date is a command which will print or set the current time; by default, it prints or sets the time in the system time zone, but with the -u flag, it prints or sets the time in UTC and, with the TZ environment variable set to refer to a particular time zone, prints or sets the time in that time zone.