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RC3502 DATASHEET
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RC@Computer,
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February@1980.
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Introduction.
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1
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The demand for mini computer systems capable of maintaining fast, reliable
and intelligent communications among several general purpose computers
and remote users has increased rapidly during the last decade.
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The computing techniques of the 1980's - applied on the RC3502 mini computer -
combined with the experience and know-how gained in the 1970's comprise a
unique mini computer system with the following distinct features:
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- Up to 128 micro processor based interrupt levels in one single processor
system,
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- Up to 74 sets of working registers, each with 12 individual registers,
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- A parallel multi processor bus which - via the logic of the multi processor
monitor - enables up to 64 RC3502 processing units to act as one system with a practically unlimited processing power, memory and I/O capacity,
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- A highly advanced input/output system featuring:
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A. 2 Mbps serial transmission per I/O channel and an electrical burst speed
of 5 Mhz,
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B. Fully magnetic insulation between I/O channels and processing unit,
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C. Peripheral devices attached to I/O channels may be displaced up to 500
feet from the processing unit without application of modem equipment, and
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D. For ease of system duplication, the I/O channels are switchable while
the system is in on-line service.
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- An internal memory capacity of up to 128 Mega (million) bytes.
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- A high-level language - PLATON80 - that is an enhanced version of the
standard PASCAL programming language specially designed to exploit the
virtues of the RC3502 architecture. A PLATON80 cross-compiler is available
on the RC8000 general purpose computer.
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- A multi-processor, multi-programming system capable of handling up to 64
RC3502 multi-bus coupled processing units with common memory.
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Furthermore, the system contains:
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A. Semaphore handling.
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B. Scheduling.
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C. Inter-processor communication.
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D. Inter-process communication and synchronisation by message-passing.
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- In addition to the multi processor structure, the RC3502 contains an
interprocessor connection based on I/O channels, ensuring high reliability
the possibility of graceful degradation.
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- Internationally standardised electrical and mechanical components guaranteeing
prompt incorporation of new techniques in the future development of the 
RC3502 mini computer.
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Viewing the distributed nature of the RC3502 multi-processor design it is
no longer true that a processor is central. Therefore, throughout this paper
the term "Central Processing Unit" (CPU) has been replaced by the term
"Processing Unit" (PU).
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Technical Data.
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2.
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- Dynamic MOS memory with a cycle time of 480 nano seconds,
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- 16 bit arithmetic unit based on four AM2901A CPU bit slices,
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- available hardware modules:
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* PU module
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* Memory module containing 64 K bytes
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* Multi-bus interface
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* 8 channel I/O channel module
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* 4 channel high speed HDLC X.25 level 2 communication module
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* Front-end processor adapter to the RC8000 computer
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* 8 channel low speed asynchronous multiplexer.
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- The functional units are realised as printed circuit boards following
the DIN 41.494 standard.
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- Each crate has 19 positions, and they are used as follows:
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* 2 positions for the PU module,
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* 17 free positions for memory, multi-bus interface, I/O channel modules
etc.
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The Processing Unit.
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3.
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A RC3502 Processing Unit is a 16 bit computer with local memory and local
I/O channel modules.
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- Address space in local memory: 2 Mega bytes.
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- Address space in global memory: 128 Mega bytes.
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- 128 interrupt levels of which 123 may be used for I/O operation.
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- 74 register sets, each containing 12 individual registers.
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- The register sets are dynamically distributed among active process
incarnations.
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- Scheduling in three priority levels:
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high:
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hardware controlled priority.
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medium:
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round robin.
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low:
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This level is divided into a number of layers, 0,1,2, ... , each allowed
to use 
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@@@@@1/(2^i) of the PU time.
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Within each layer scheduling is performed by time sliced round robin.
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- The standard scheduler may be replaced by a special scheduler, adapted
to the need of actual applications.
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- I/O capacity is 2 Mbps, equivalent to 15 64 Kbps full duplex HDLC 
communication lines.
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Multi PU System.
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4.
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An RC3502 system may consist of 1 and up to 64 Processing Units (PU's),
each with full memory and I/O capacity.
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A high speed parallel multi-bus provides:
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* exchange of interrupts between PU's,
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* facilities for inter process communication,
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* memory capacity of up to 128 M bytes,
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* any PU may address the total memory in the multi PU system.
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Instruction Set.
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5.
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RC3502 is a stack-oriented computer with an instruction set specifically
designed to support high-level programming language constructs.
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The instruction set provides:
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* easy compilation and fast execution of procedure oriented software
modules, as recommended in the programming language PLATON80.
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* integer arithmetic operating in two's complement.
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* effectiveness of I/O operations.
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Instruction format:
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- one byte instruction code,
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- 0, 1 or more bytes are instruction parameters.
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Elements of the instruction set:
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* stack operations such as push and pop,
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* arithmetic operations on upper stack elements,
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* procedure call and - return, case statement direct branch,
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* a set of I/O instructions for status handling and for I/O
transfer of bytes or words, or transfer of blocks of bytes or words,
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* one instruction signal and wait operations on chained semaphores and
message exchanges between process incarnations located anywhere in the
multi PU system,
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* selection instruction to assign a set of working registers to an
interrupt level,
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* timing instructions.
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Addressing modes:
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* absolute,
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* global,
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* local,
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* intermediate,
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* relative.
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Software System.
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6.
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The basic RC3502 system is provided with a high-level programming language
PLATON80, a Monitor and a basic operating system.
PLATON80 is based on the programming language PASCAL and provides high-level
constructs for multi-programming and input/output.
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PLATON80 is used for programming of:
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* Monitor
* Scheduler
* Loader & Linker
* Operating System
* Drivers
* Application programs
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As the stack-oriented P-code is specially designed for the execution
of procedure-oriented languages such as PLATON80, the object code
generated by the PLATON80 compiler is very effective.
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System Facilities.
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7.
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* dynamic creation, removal, start and stop of process incarnations,
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* communication by means of queue semaphores,
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* PLATON80 cross-compiler programmed in PASCAL on RC8000,
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* dynamic link of compiled programs,
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* load from different sources, such as communication lines (i.e. down
line load) or standard peripheral devices.
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--------- o0o ---------
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Information given in this paper  is subject to change without notice.
«eof»
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