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Hardware Input/Output Controller¶

ND 865/ND 867 PIOC¶

Programmable Input/Output Controller¶

flowchart TD
    A[ND-100 Bus] <---> B[ND-100 Interface]
    B --> C[Comm. Line Interface]
    B --> D[Comm. Line Interface]
    B --> E[Comm. Line Interface]
    B --> F[Comm. Line Interface]
    B --> G[Comm. Line Interface]
    B[ND-100 Interface] --> |Shared memory| H[128 KB / 512 KB]
    B[ND-100 Interface] --> |Local processor| I[MC 68000]

Programmable I/O Controller (PIOC)

Introduction¶

The ND 865/ND 867 Programmable Input/Output Controller is a processor board for the ND-100 Computer Systems. It is capable of handling four full duplex communication lines, thereby relieving the ND-100 computer of much of the communication protocol overhead. It is equipped with a local processor, MC 68000, and a total of 128 Kbyte or 512 Kbyte Random Access Memory (RAM) with memory protection mechanism. The RAM is also accessible directly from the ND-100 computer. Each communication channel has bidirectional direct memory access (DMA) to the local memory.

Features¶

Four full duplex channels with bidirectional DMA
RS 232 C (V.24/V.28) and RS 422 (V.11/X.27) interface on all channels
Synchronous HDLC, SDLC or BISYNC and Asynchronous modes
Speed up to 820 Kbits/s on one line or 38 Kbits/s on all lines simultaneously
128/512 Kbyte shared memory with single error correction and DMA access
Power failure recognition and recovery
Real-time clock
Powerful local processor MC 68000 with 8 MHz clock frequency

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Product Description¶

The 128 K/512 Kbytes in PIOC are directly accessible from the ND-100 computer. The ND-100 computer and MC 68000 processor communicate via addresses in the common memory.

The RAM memory is equipped with a protection mechanism to protect against writing from input DMA and MC 68000 user. The memory is divided into segments of 512 bytes. Write access to each segment is controlled by a bit in a protection table. The protection table is set up by the PIOC operating system.

The input/output circuits on the board are only accessible from MC 68000.

Baud rates are individually programmable on all four channels. Baud rate is set by changing a counter register in the AM 9513 system timing controller. Possible baud rates are calculated by the following algorithm:

Synchronous baud rate = 4915200/(2 * N)
Where N varies from 3 to 65535

Asynchronous baud rate = 4915200/(2 * N * 16)
Where N varies from 1 to 65535

The line interface consists of four equivalent parts, and can handle four full duplex channels. The serial controller (Z80-SIO) may be programmed for either synchronous or asynchronous transmission and can be used for both bit-oriented (HDLC/SDLC) and byte-oriented procedures.

The ND 865 PIOC has 128 Kb of shared memory while the ND 867 PIOC has 512 Kb of shared memory.

Requirements¶

ND-100 Computer System.

Documentation¶

PIOC Hardware Reference Manual
ND-865 and ND-867.................................ND-02.004

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Contact Information¶

Location	Details
Oslo	tel. 02-309030, ttx. 18661 nd n
Bergen	tel. 05-20360
Sandnes	tel. 04-665769
Tromsø	tel. 083-771662
Trondheim	tel. 07-921222, ttx. 55580 nd trd
Stockholm	tel. 790-9300, ttx. 15255 nordata s
Gothenburg	tel. 031-49670
Malmö	tel. 040-25160
Copenhagen	tel. 01-252565, ttx. 37275 nd dk
Århus	tel. 06-12055
Farum, Holte	tel. 080-3816, ttx. 38563 nordata ferv
Paris	tel. 1-42303266, ttx. 20016 nd paris
Leuven	tel. 016-31030, ttx. 37907 norvin
Lausanne	tel. 041-29122, ttx. 26218 nd ld
Newbury	tel. 0635-35544, ttx. 849819 norsk g
London	tel. 1-586 9936
Manchester	tel. 061-881 6764
Bussum	tel. 0329-38763, ttx. 40940 nd nl
Los Angeles	tel. 213-737-7945, ttx. 921740 nordat well
Cerritos	tel. 213-926-5051, ttx. 678401 tab irvin
Bern	tel. 03-810150
Milan	tel. 51-6072111
Hanover	tel. 51-89829441, ttx. 856770 nd d
Stuttgart	tel. 89-352065
Abraham Lincoln Str. 30	tel: 06-1 48764, fax: 12106
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