TURBOchannel
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TURBOchannel was a proprietary computer bus used by DEC in the majority of the MIPS-based DECstation line, some of the later VAXstations, as well as some early DEC Alpha-based systems. DEC abandoned use of TURBOchannel in favor of the PCI bus around the mid-1990s.
TURBOchannel shared many similarities with other proprietary local buses from the late 1980s and early 1990s, such as Sun Microsystems SBus and IBM's Micro Channel architecture. It was a 32-bit bus and came in variants between 25 MHz and 12.5 MHz, which had about 100 MB/s to 50 MB/s bandwidth.
All TURBOchannel cards had their ROM in MIPS assembler, so the systems with another CPU used a small MIPS emulator in their boot consoles.