Q-bus and Unibus get Winchesters

8086 at 8 MHz partners 8087 on Duet micro

Dev,ce Selects

SN74LS138

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TV Display Section Is Optional

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Address \

A0-A15

SN74LS783

MC6883 SAM

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1I D A 0

VDG

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MC6847

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la~llDD0-DD7

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CAS

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MC6809E MPU

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Data

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D0-D7

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.,,. 4K, 8K, 16K 32K or 64K

BYTES

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MC1372

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A synchronous address multiplexer from Motorola is now available in the UK. The SN74LS783/MC6883 Schottky IC links the MC6809E microprocessor unit and MC6847 colour video display generator with up to 64 kbyte of static or dynamic RAM. It is also compatible with MC6800 and MC68000 devices. The addressing range is 96 kbytes. A single crystal provides all timing functions. The multiplexer is register programmable. Device-select functions are decoded on chip. A direct memory access mode is included. The SN74LS783/ MC6883 comes in a 40-pin plastic or ceramic dual-inflne package. It operates at +5 V. (Motorola Ltd, Semiconductor Products Division, York House, Empire Way, Wembley, Middx HA90PR, UK. Tel: 01-902 8836. UK distributor: Lock Distribution Ltd, PO Box 0L64, Neville Street, Oldham OL9 6PY, UK. Tel: (061) 6527311. Telex: 669619)

Noise gain analyser gives readout of gain in swept frequency mode over 10 to 1800 MHz A noise-gain analyser has been introduced by Eaton of the UK. The Ailtech 2075 measures noise received and gives a readout of the gain of a device under test in a swept-frequency mode. Eaton says the readout is simultaneous and the accuracy over the 10-1800 MHz range is +0.05 dB for noise and +-0.2 dB for gain. The analyser has a noise figure of

Noise-gain analyser

344

7 dB, a voltage standing wave ratio less than 1.5 and a frequency resolution of 100 kHz, says the maker. Digital plotters and oscilloscopes can be linked into the instrument via either the IEEE-488 instrument bus or analogue outputs. Using two microprocessors and an A/D converter, the Ailtech 2075 avoids offline data corrections for image response effects, second-stage noise and reference temperature deviations from 290 K. The analyser is programmable via the I EEE-STD-488-1978 interface bus. It takes 51/~ in of panel space in rackmounted configurations. (Eaton Ltd,

Sherwood House, High Street, Crowthorne, Berks RG1 1 7A-I-, UK. Tel: (0344) 771111)

The Duet-16 is a 16-bit microcomputer from Lambart Micro Computers. It is based on a 16-bit 8086 running at 8 MHz. An 8087 maths coprocessor can also be included. The operating system is MS-DOS. BASIC-86 is supplied with the system. Advanced BASIC and COBOL are also available. The CPU has two communications ports, a parallel printer port and an IEEE-488 port. It communicates with other computers up to and including mainframes, using TSS software. The Duet-16 has a basic 96k of colour graphics RAM giving eight colours. Characters may be superimposed on the graphics screen.

(Lambart Micro Computers Ltd, 52 Moorbridge Road, Maidenhead, Berks SL6 8BN, UK. Tel: (0628) 72037/ 74916. Telex: 848635 LAMCOM G)

Q-bus and Unibus get Winchesters The Gemini range of Winchester discs has been introduced by UK company Compass. The discs are for use with certain DEC computer systems and with Q-bus and Unibus computers. Configurations A and B are Q-bus compatible. Both are available with 5¼-in and 8-in drives with ST506, SMD or SA4000 interface. They come in either 19-in rack mount or tabletop mount with all interfacecards and cables. Configurations C and D are Unibus compatible. They use 8-in drives (SMFD interface) and con~e in 19-in rack mount with all interface cards. Gemini A and B run under DEC operating systems RT11, RSX11 and RSTS. They emulate RK05, RL01/2, RP02/3, RK06/7 or RM02/3. Gemini C and D run under operating systems RT11, RSX11, RSTS and MUMPS and emulate RP02/3 or RM02/3. (Compass

Ltd, 67 Milford Road, Reading, Berks RG1 8NA, UK. Tel: (0734) 507635. UK distributors: Hawke Electronics Ltd, A motex House, 45 Hanworth Road, Sunbury on Thames, Middx, UK. Tel: 01-979 7799. Telex: 923592)

microprocessors and microsystems