R3000The R3000 is a 32-bit RISC microprocessor chipset developed by MIPS Computer Systems that implemented the MIPS I instruction set architecture (ISA). Introduced in June 1988, it was the second MIPS implementation, succeeding the R2000 as the flagship MIPS microprocessor. It operated at 20, 25 and 33.33 MHz. The MIPS 1 instruction set is small compared to those of the contemporary 80x86 and 680x0 architectures, encoding only more commonly used operations and supporting few addressing modes.
Flat memory modelFlat memory model or linear memory model refers to a memory addressing paradigm in which "memory appears to the program as a single contiguous address space." The CPU can directly (and linearly) address all of the available memory locations without having to resort to any sort of bank switching, memory segmentation or paging schemes.
Indicateur de retenueDans un processeur, l'indicateur de retenue, (Carry Flag en anglais, généralement noté C) est un des bits du registre d'état utilisé pour indiquer qu'une retenue ou un emprunt arithmétique a été généré sur le bit de poids fort de l'UAL. L'indicateur de retenue permet aux nombres d'une largeur supérieur à celle d'une UAL d'être additionnés/soustraits en retenant (ajoutant), au bit de poids faible d'un mot plus grand, un chiffre binaire d'une addition/soustraction partielle.
Sun-4Sun-4 is a series of Unix workstations and servers produced by Sun Microsystems, launched in 1987. The original Sun-4 series were VMEbus-based systems similar to the earlier Sun-3 series, but employing microprocessors based on Sun's own SPARC V7 RISC architecture in place of the 68k family processors of previous Sun models. Sun 4/280 was known as base system that was used for building of first RAID prototype. Models are listed in approximately chronological order. {| class="wikitable sortable" |- !Model !Codename !CPU board !CPU !CPU MHz !Max.
WeitekWeitek Corporation was an American chip-design company that originally focused on floating-point units for a number of commercial CPU designs. During the early to mid-1980s, Weitek designs could be found powering a number of high-end designs and parallel-processing supercomputers. Weitek started in 1981, when several Intel engineers left to form their own company. Weitek developed math coprocessors for several systems, including those based on the Motorola 68000 family, the 1064 and 1164, and for Intel-based i286 systems, the 1067.
Motorola 68451The MC68451 is a Motorola (now Freescale) Memory Management Unit (MMU), which was primarily used in conjunction with the Motorola MC68010 microprocessor. The MC68451 supported a 16 MB address space and provided a MC68000 or a MC68010 with support for memory management and protection of memory against unauthorized access. The block size was variable, so it was usually used for segment-based memory management. It supported the mapping of up to 32 memory segments or pages of a variable size from logical to physical addresses.
Sharp X68000Le Sharp X68000, communément appelé X68000 ou X68k, est un ordinateur personnel de Sharp Corporation commercialisé au Japon à partir de 1987. Le premier modèle utilisait un microprocesseur Motorola 68000 à 10 MHz, avec 1 mégaoctet de mémoire vive et aucun disque dur. Le dernier modèle, lancé en 1993, avait un Motorola 68030 à 25 MHz, avec 4 Mio de mémoire vive et un disque dur SCSI de 80 Mo en option. Les modèles de base comportaient deux lecteurs de disquettes 5" 1⁄4.
Alliance AIML'Alliance AIM était une alliance formée en avec pour partenaires Apple, IBM et Motorola. L'objectif de cette alliance était de créer de nouveaux standards informatiques autour de l'architecture de processeur PowerPC. Le but affiché de l'alliance était de concurrencer la plateforme dominante à base de processeurs basés sur l'architecture x86, dite Wintel, par la définition d'une nouvelle plateforme ainsi que d'un système d'exploitation nouvelle génération.
OpenStepOpenStep is a defunct object-oriented application programming interface (API) specification for a legacy object-oriented operating system, with the basic goal of offering a NeXTSTEP-like environment on non-NeXTSTEP operating systems. OpenStep was principally developed by NeXT with Sun Microsystems, to allow advanced application development on Sun's operating systems, specifically Solaris. NeXT produced a version of OpenStep for its own Mach-based Unix, stylized as OPENSTEP, as well as a version for Windows NT.
