The MIPS Magnum was a line of computer workstations designed by MIPS Computer Systems, Inc. and based on the MIPS series of RISC microprocessors. The first Magnum was released in March, 1990, and production of various models continued until 1993 when SGI bought MIPS Technologies. SGI cancelled the MIPS Magnum line to promote their own workstations including the entry-level SGI Indy. The early, R3000-based Magnum series ran only RISC/os, a variant of BSD Unix, but the subsequent Magnum workstations based on the Jazz architecture ran both RISC/os and Windows NT. In addition to these proprietary operating systems, both Linux and NetBSD have been ported to the Jazz-based MIPS Magnum machines. Some models of MIPS Magnum were rebadged and sold by Groupe Bull and Olivetti. In addition, headless (i.e., without a framebuffer or video card) versions were marketed as servers under the name "MIPS Millennium". Series Model number information. MIPS Magnum 3000 Alternative model name: MIPS RC3230 Release: March, 1990 Initial price: $9000 USD Bus: TURBOchannel Maximum possible RAM: 128 MB MIPS Magnum R4000 Two subtypes: The R4000 PC-50 and R4000 SC-50 Release: April, 1992 Initial price: $12,000.00 USD Bus: EISA Maximum possible RAM: 256 MB Components Processors The MIPS Magnum 3000 has a 25 or 33 MHz MIPS R3000A microprocessor. The MIPS Magnum R4000 PC-50 has a MIPS R4000PC processor with only 16 kB L1 cache (but no L2 cache), running at an external clock rate of 50 MHz (which was internally doubled in the microprocessor to 100 MHz). The MIPS Magnum R4000 SC-50 is identical to the Magnum R4000PC, but includes one megabyte of secondary cache in addition to the primary cache. Memory For main memory, the MIPS Magnum 3000 accepted 30-pin true-parity, 80ns SIMMs up to a maximum of 128 MB. The MIPS Magnum R4000 accepted eight 72-pin true-parity SIMMs, up to a maximum of 256 MB. SCSI The MIPS Magnum R4000 (both the R4000 PC-50 and R4000 SC-50) includes a single on-board SCSI bus using the on-board NCR 53c94 fast-narrow SCSI chipset. An internal cable with four 50-pin connections links internal SCSI devices, and also interfaces external SCSI devices via an endlink mounted on the rear of the case. Ethernet The MIPS Magnum R4000 includes an on-board SONIC Ethernet chipset and an AUI Ethernet connector mounted on the case. Framebuffer The video output for the Magnum R4000 consists of a proprietary framebuffer available as a custom full-length