80-Bus News

  

May-June 1984, Volume 3, Issue 3











Page 50 of 51











CMOS RAM BOARD RB32KC

RBI2ZKC C.M.0.S. BATTERY BACKED RAM BOARD

POWER FALLURE? Memory contents are preserved during power failure by a Ni-cad bacctery that is automatically recharged when the board is powered up. Contents are secure for up to 40 days.

PAGE MODE SCHEME SUPPORTED. The board may be configured as one 32K or two 16K pages.

FLEXIBLE ADDRESS DECODING. Any 4K memory block may be located on any 4K boundary in the processor address space.

NO SOLDERING. All options are selected by wire Links pushed into gold plated connectors.

EPROM OPTION. On chis board, RAM and EPROMs may be mixed.

EPROM PROGRAMMER/ERASERS ARE NO LONGER REQUIRED because by loading a@ RAM block and then using che hardware write protect Link, the block becomes equivalent to EPROM.

FEATURES HARDWARE AND/OR SOFTWARE READ/WRITE PROTECTION. FULLY 80-BUS AND NASBUS COMPATIBLE.

BACKPLANE BP14C

BP14C 14 SLOT 80-BUS & NASBUS TERMINATED BACKPLANE (Bare Board Weighs 15 oz!)

* Ground plane on one side of double sided 2.4mm thick printed circuit board.

* ALL active BUS signals interlaced with ground ‘shield’ tracks.

* All active BUS signals terminated into a potential balanced R.C. filter.

* Proper implementation of both the interrupt and BUS request daisy chains.

* Large tracks for power lines.

* Size 15" x 8". Fits neatly into 19" rack. * Easily cuc for smaller systems.

Supplied builc and tested wichout connectors. PRICES:

RB32KC 32K Bytes £225.00 77 way connectors for uses with BPL4C £4.30 16K Bytes £193.00 Few left – Visually imperfect BP14C £47.00 2K Bytes £165.00 Few Left – RB32KC Bare Boards Rev. D £62.50 BP1L4C Backplane £57.00 Memory – Hitachi HM6116LP-3 £5.75

Plus £1.50 per board post and packing, plus VAT.

MICROCODE (CONTROL) LTD.

40 WELL TERR., CLITHEROE, LANCS,, UK. 0200 27890

GEC LTU-11 PRESTEL MODEM KIT

The GEC LTU-11 PRESTEL modem kit consists of two components, the modem card and the direct telephone coupler. The modem card accepts 1/0 at TTL levels at 75 BAUD and returns data at TTL levels at 1200 BAUD. The modem card produces the necessary modem tones which are fed to the direct coupler. The coupler consists of the line isolation transformer which sends and receives the modem tones and has TTL level inputs for the control relays for line seize and auto-dial. Power- supplies are +5 volts and -5 volts. The units individually have BT approval, but as the unit is supplied as a kit, the BT approval is void. Supplied complete with connection data and auto-dial software.

GEC LTU--11 modem card 14.95 inc. VAT. (13.00 + VAT).

GEC LTU-11 direct coupler 14.95 inc. VAT. (13.00 + VAT). Carriage & packing 75p for each unit.

STC NOVATEL

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TERMINAL,

Features

7 diag. green screen, 240V AC mains operated. detachable key pad, robust case 14’ x 12" x Ty,"

video cutput for other monitors,

security lock. ete. ib ris

£129.95...

tee De ie eee ORDER BY POST OR PHONE OR CALL IN AND SEE FOR YOURSELF

ideal for travel agents. offices. stock markel, educational, home and alf Prestel informatiant

COMPUTER SHOP

404/406 Edgware Road, London, W2 TED Telephone: 01-402 6822

TRANSDATA MODEM CARDS.

Brand new, tested and aligned 300 BAUD answer and originate acoustic telephone modem cards manufactured by TRANSDATA for their model 317 acoustic modem. Full CCITT specs. Requires only a few components to complete (no case available). Computer interface is 300 BAUD RS232 1/0. The power supplies of +12 volts at 18QmA and -12 volts at 170mA are required. Card size 350mm x 105mm. May be directly connected using the GEC LTU 11 coupler (see below). Full circuit description, drawings and connection data supplied. Suitable for use with computers fitted with 300 BAUD RS232 1/0. Software for Nascom & Gemini published in the last issue.

Card only at 29.95 inc. VAT. (26.04 + VAT)

Supplied with LEDs connector, switches and transducers at 34.95 inc. VAT. (30.39 + VAT)

Supplied with LEDs connector, switches and GEC LTU 11 direct coupler at 45.95 inc. VAT. (39.96+ VAT)

Carriage & packing 1.00

MINOR MIRACLES 2000 MODEM

The Minor Miracles 2000 direct connect answer and originate modem is an all ‘bells and whistles’ modem capable of Bell and CCITT protocols at 300/300, 600/75, 600/600, 1200/75 and 1200/1200 BAUD receive/transmit with optional auto-dial and auto-answer. Automatic mode select under software control. Requires RS232 1/0 for data transmission and an optional 4-bit port for mode control. Uses the AMD 7910 ‘world series’ modem control chip. BT approved (until you remove the link to activate the Bell protocols). Separate 220-240V AC mains powered. Size approx. 140mm x 70mm x 180mm. Supplied complete with lead terminated in BT620 (the new rectangular type) plug, manuals, etc.

Modem 148.35 inc. VAT. (129.00 + VAT). Auto-dial option 34.50 inc. VAT. (30.00 + VAT). Carriage & packing 1.00

TELEMOD 2 MODEM

The Telemod 2 direct connect answer and originate modem uses the European CCITT protocols and offers 1200/75 and 1200/1200 BAUD receive/transmit. Requires RS232 1/0 for data transmission. Separate 220-240V AC mains powered. Supplied with lead terminated with 81620 plug and manuals. Size 165mm x 55mm x 235mm.

Modem 99.95 inc. VAT. (86.90 + VAT). Carriage & packing 1.00

ON A GEMINI IVC OR SVC

The new Henelec Prestel Terminal software turns your CP/M based Nascom or Gemini, fitted with the GEMINI GM812. or GM832, into a full blown PRESTEL terminal. Automatic character sets give proper prestel characters and mosaics. Automatic select of 40 by 24 screen size, full prestel screen wrapround. Message facilities allowing full keyboard entry to the bill boards. Downloading of prestel pages to disk. Optional auto-dial (with suitable modem) and ID transmit. Suitable for most 1200/75 BAUD modems, but designed around the Minor Miracles 2000, the Telemod 2 and the GEC LTU-11. Try cracking the PRESTEL access codes for yourself!!!

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Supplied on disk (please state format) at: 29.95 inc. VAT. (26.04 + VAT). Carriage & packing 50p

BIG BIG BIG POWER SUPPLIES Ex-equipment GOULD power supplies for those who

need a lot of power.

Type 1 +5 valts at 20 amps. 7” x 4" x 3.5" o.a. Switch mode. 220-240 V AC in. 25.95 inc. VAT. (22.56 + VAT) Carriage & Packing 2.00

Type 2 ‘+12 volts at 4 amps, +5 volts at 40 amps -ยง volts at lamp, --12 volts at 1 amp 14.5 x 6" x 3.5" o.a. (including fan) Thyristor switch mode. 220-240 V AC in 29.95 inc. VAT. (26.04 + VAT) Carriage & packing 4.00

OPEN 6 DAYS A WEEK

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This is an OCR’d version of the scanned page and likely contains recognition errors.











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