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Mansa Musa was the ruler of the Mali Empire in West Africa. Details recorded here should be sourced; unknown information is left blank.
MORE →Reflects the personal views, recollections, and perspective of the author, Mike Davis.
This is a personal recollection on the Move fire on May 13, 1985
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The Job File Table (JFT) is an MS-DOS data structure in the Program Segment Prefix (PSP). It starts at PSP offset 0x18 and is 20 bytes long. For each open file handle, DOS stores the index into the System File Table (SFT). A file handle that is returned by open, _open, and other similar functions is simply an index into the JFT where DOS stored the SFT entry index for the file or device that the program opened.
When a program starts, the first 5 entries in the JFT are preconnected to the standard devices. All other handles are marked as closed by setting the value of the entry to 0xFF. The standard devices are initialised as follows:
| Handle | Description |
|---|---|
| 0 | Standard input |
| 1 | Standard output |
| 2 | Standard error |
| 3 | COM1 |
| 4 | LPT1 |
Handles 0-2 are connected to the console device. During program execution they can get modified (closed, redirected) like any other handle.
Because the size of the JFT in the PSP is limited to 20 bytes, originally only 15 files (20 minus the 5 standard devices) could be open at a time. In MS-DOS 2.0, the Extended Job File Table was introduced, which allowed up to 254 files to be opened.
As of MS-DOS 3.30, the size of the JFT can be modified with a call to INT 21h, 67h.
Source: Wikipedia. Article content is retrieved live through the MediaWiki API.
The Job File Table (JFT) is an MS-DOS data structure in the Program Segment Prefix (PSP). It starts at PSP offset 0x18 and is 20 bytes long. For each open file handle, DOS stores the index into the System File Table (SFT). A file handle that is returned by open, _open, and other similar functions is simply an index into the JFT where DOS stored the SFT entry index for the file or device that the program opened. When a program starts, the first 5 entries in the JFT are preconnected to the standard devices. All other handles are marked as closed by setting the value of the entry to 0xFF. The standard devices are initialised as follows: Handles 0-2 are connected to the console device. During program execution they can get modified (closed, redirected) like any other handle. Because the size of the JFT in the PSP is limited to 20 bytes, originally only 15 files (20 minus the 5 standard devices) could be open at a time. In MS-DOS 2.0, the Extended Job File Table was introduced, which allowed up to 254 files to be opened. As of MS-DOS 3.30, the size of the JFT can be modified with a call to INT 21h, 67h.
File Allocation Table (FAT) is a file system developed for personal computers and was the default file system for the DOS and Windows 9x operating systems. Originally developed in 1977 for use on floppy disks, it was adapted for use on hard disks and other devices. The increase in disk drive capacity over time drove modifications to the design that resulted in new versions: FAT12, FAT16, FAT32, and exFAT. FAT was replaced with NTFS as the default file system on Microsoft operating systems starting with Windows XP. Nevertheless, FAT continues to be commonly used on relatively small capacity solid-state storage technologies such as USB flash drives, SD cards, MultiMediaCards (MMC) and eMMC because of its compatibility across operating systems and embedded systems, and ease of implementation.
Chemical table file (CT file) is a family of text-based chemical file formats that describe molecules and chemical reactions. One format, for example, lists each atom in a molecule, the x-y-z coordinates of that atom, and the bonds among the atoms. The formats were created by MDL Information Systems (MDL), which was acquired by Symyx Technologies then merged with Accelrys Corp., and now called BIOVIA, a subsidiary of Dassault Systèmes of Dassault Group. The CT file is an open format. BIOVIA publishes its specification. BIOVIA requires users to register to download the CT file format specifications.
In computer programming, a handle is an abstract reference to a resource that is used when application software references blocks of memory or objects that are managed by another system like a database or an operating system. A resource handle can be an opaque identifier, in which case it is often an integer number (often an array index in an array or "table" that is used to manage that type of resource), or it can be a pointer that allows access to further information. Common resource handles include file descriptors, network sockets, database connections, process identifiers (PIDs), and job IDs. PIDs and job IDs are explicitly visible integers; while file descriptors and sockets (which are often implemented as a form of file descriptor) are represented as integers, they are typically considered opaque. In traditional implementations, file descriptors are indices into a (per-process) file descriptor table, thence a (system-wide) file table.
Before the 1921 destruction of Tulsa’s Greenwood District, Black residents had created a remarkable center of business and community life. The district included stores, professional offices, entertainment venues and homes owned by Black citizens. Understanding Greenwood means learning what was built—not only what was burned.
MORE →Joe Louis.
