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Preface The IMSB008isaTRAM (TRAnsputerModule) motherboard that enables users to build multi-transputer systems that can be plugged into an IBM PC-XTorPC-AT. The board is a member of a family of TRAM motherboards which have a compatible architecture. External signals are available which enable it to control a subsystem of motherboards, or to be a component of sucha subsystem. Fora general description of TRAMs and motherboards, refer to the speci- cation Dual-In-Line Transputer Modules (TRAMs), published & 8230;

4 Transputer, TRAMs and TRAM motherboard background The INMOStransputer family includes 16 and 32-bit processors. These are all capable of communicating with each other and can be programmed when connected together to execute tasks in parallel. Full information on transputerscanbe found in The Transputer Databook[1]and in other IN- MOS publications. The IMSB008 uses one transputeron-board for network conguration and can support transputer arrays in the form of TRAMs. 4.1 INMOSLinks Transputersuse special serial communication connections to talk to each other. These are called INMOS links, or links. Links use two wires to send data in two directions between twotransputers (or other chips) at up to 20Mbits/s. All communication between TRAMs on the IMSB008, and between the TRAMs and the PC bus interface, is via links. For full information on links see[1]and[2]. 4.2 TRAMs TRAMs are small circuit modules which communicate via INMOS serial links. A full TRAM background is to be found in[3]. The smallest TRAM (called& 8221;size 1& 8243;) is about 31/2& 8243;by 1& 8243;and has eight IC-type pins along each of the short ends. These sixteen pins carry four INMOS links, reset signals, clock and power supplies. TRAMs are plugged into a motherboard (or baseboard) just like socketed ICs. Larger TRAMsare simply a multiple of the size 1 footprint. Thus, a& 8221;size 2& 8243;TRAM occupies two of the sockets into whichasize 1 TRAM will plug. In order to avoid confusion, discussions about motherboards (such as the IMSB008) always refer to& 8221;slots& 8221; (see gure3). A slot is one position into which a size 1TRAM maybe plugged. So, for instance, the IMSB008 3 The term softwire is used to describea connection made between two links via a IMSC004 linkswitch

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