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It is thus a general object of the present invention to provide improved digital computers. It then finishes the power up diagnostic testing and starts the CPU.

It is a particular object of the present invention to provide digital computers that may be interconnected to form a highly efficient distributed computing system. 101 (prior art) is a block diagram of a typical prior art general purpose computer employed in a distributed computer network. 102 is a block diagram of the computer of the present invention employed in a distributed computer network. During normal run time, IOC 202 services devices connected to it.

Detailed Description of MBus 2054.1 OVERVIEW4.1.2 Configuration4.2 OPERATION4.2.1 Definitions4.2.2 Signals4.2.2.1 Signal Groups4.2.2.2 Data4.2.2.3 Addresses4.2.2.4 Control Signals4.2.2.5 Interrupt Support4.2.3 Addressing4.2.4 Control Functions4.2.4.1 Basic Read4.2.4.2 Double Read4.2.4.3 Simple Write4.2.4.4 Double Write4.2.4.5 Read-Modify-Write4.2.4.6 Double Read-Modify-Write4.2.4.7 Refresh/Sniff4.2.4.8 ERCC Disable4.2.5 Timing4.2.6 Dynamic RAM Cycle Initialization4.2.7 Interrupt Service4.3 ELECTRICAL CHARACTERISTICS4.3.1 Signal States4.3.2 Signal Types4.3.3 Signal Loading4.3.4 Termination and Pull-ups4.3.5 Timing4.3.5.1 Bus Clock4.3.5.2 Bank Select Setup and Hold4.3.5.3 Address Setup and Hold4.3.5.4 Memory Access4.3.5.5 Write Data Setup and Hold4.3.5.6 MEMWAIT Signal Requirements4.3.5.7 ERCCDIS4.3.5.8 Non-Maskable Interrupts5. 226 through 234 illustrate the timing of various bus control signals in relation to the Bus Clock signal. 235 shows the timing of various control signals relative to the power-up condition. It is two way interleaved to enhance consecutive access performance.

Detailed Description of VCU 2065.1 OVERVIEW5.2 FUNCTIONAL DESCRIPTION5.2.1 Hardware Overview5.2.1.1 Pixel Mode Overview5.2.1.2 Plane Mode Overview5.2.2 Programming Overview5.2.2.1 General5.2.2.2 NORMAL space/OTHER space5.2.2.3 Restrictions5.2.2.4 Access types5.2.2.5 Keyboard and mouse5.3 GRAPHICS DATA PROCESSOR 3145.3.1 Functional Description5.3.1.1 Hardware Overview5.3.1.2 Control Overview5.3.1.3 Detailed Controls5.3.2 Detailed Functional Description5.3.2.1 EXTernal Accesses5.3.2.2 EXTernal PLANE Access5.3.2.3 INTernal Accesses5.3.2.4 Character Accesses5.3.2.5 Using the LALU5.3.3 Timing Diagrams5.4 VCU 206 DETAILED OPERATION5.4.1 Video RAMs5.4.2 Video Output Stage5.4.3 M-Bus Interface5.4.4 Basic Timing5.4.4.1 Video Timing5.4.5 Video Palette5.4.6 Refresh5.4.7 Keyboard5.4.8 Mouse5.4.9 COM DATA/COM STATUS Registers5.4.10 DC/DC Converter5..5.1 Converting from 8 to 24 bits/pixel5.6 PROGRAMMING DESCRIPTION5.6.1 Board Selection/LAR5.6.2 OTHER Space Accesses5.6.2.1 LALU Register5.6.2.2 PLANE ENABLE Register5.6.2.3 FOREGROUND Register5.6.2.4 BACKGROUND Register5.6.2.5 COM DATA Register5.6.2.6 COM STATUS Register5.6.2.7 Keyboard/LED Register5.6.2.8 PIXEL ENABLE Register5.6.3 NORMAL Space Accesses5.6.3.1 Host Accesses5.6.3.2 Internal Accesses5.6.3.3 Character Drawing5.6.3.4 X and Y, SOURCE and DEST Registers5.6.4 READ/WRITE Pixel5.6.5 READ/WRITE Block5.6.6 Interrupts6. 216 through 223 are timing charts pertaining to bus arbitration and bus data transmission. Additional off-board memory may be connected to MBus 205; this may additional main memory 102, or VRAMs 113 for storing screen bit maps (see section 5). 104) is designed to support the base system I/O devices as well as SCP (system console processor) functions.

Detailed Description of VCU 2065.1 Overview5.2 Functional Description5.3 Graphics Data PRocessor 3145.4 Detailed Operation5..6 Programming Description6. LMB 203 The Local Memory Bus is the communication path from the local computer (CPU portion) and from the local I/O portion.

an error occurred while updating the firmware 6727-29

This MBus has expansion capability so that up to 16 Mbytes can be addressed by this MCU (the two gate arrays) without adding more control. The LMB initiates all local memory accesses while the I-Bus initiates all accesses of this particular node from other global nodes. The LMB and the I-Bus are the two busses that can initiate memory operations.1.2 Description of the Prior Art Digital computers in general are well known in the prior art. The I/O function provides the board with device support for the basic integrated I/O devices.Digital computers have been employed in "distributed computing networks" in which a plurality of computers are interconnected and are programmed to cooperate on an overall data processing task involving a related body of data and a related body of tasks to be performed thereon, with some computers doing some of the processing and then passing results or status information to other of the computers which perform other of the processing. This includes: an SCSI (small computer standard interface) Bus Host-Adapter Interface 468 an SA400 Floppy Diskette Controller 467 an Ethernet IEEE802.3 LAN Controller 480 Four RS232C Asynch Channels 459 (1 w/modem support) a parallel Printer Port 460 a battery-backed-up Time-of-Boot Clock/Calendar 457 The Local Memory Bus Interface is the primary communications channel between CPU 101, IOC 202, and MCU 201.

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