electronic circuit design software goes on $150 micro

1
Electronic circuit design so,ware goes on $150 micro Users of the Sinclair Spectrum $150 com- puter can take up computer-aided design on their machines with the Analyser program from UK-based Number One Systems. Priced at £35 ($52) in the UK, the program cassette is mainly for educational and indus- trial research use, where the short- comings of the 48k memory and games resolution graphics for such an application are less significant. The Analyser program evaluates the performance of electronic circuits. It analyses amplifier and filter circuits. Circuits of up to 16 nodes and 60 components can be analysed for input impedance, output impedance and gain (magnitude and phase) at linearly or logarithmically spaced frequencies. Resistors, capacitors, inductors, trans- formers, op amps, bipolar and field- effect transistors can be simulated. The program was originally written for UK computers BBC Model B and Newbrain. Over 300 copies for these computers have been sold, 80% in the UK and the rest to countries in main- land Europe and Australasia as well as to Electronic circuit simulation on a home computer India and the USA. centres. Number One Systems says it A quarter of the sales were to is confident that the Spectrum colleges and schools, three quarters to Analyser will be equally popular with industrial research and development students and junior engineering staff. 8085-based industrial control panel uses voice, sight and touch technology with RS232 Operators of the Bulletin 2700 intelli- gent panel system can communicate by voice, sight and touch with the machine or process being controlled. Made in the UK by Allen-Bradley UK-built intelligent pane/ Industrial Automation Products, the 808S-based system is for use with pro- grammable controllers and computers in industry. The Bulletin 2700 is matched to a particular application by a combina- tion of plug-in modules. A four-module system needs at most three wires for communication with its host control- ler. This means that the Bulletin 2700 system starts more quickly than most comparable systems, says Allen-Bradley, a typical time being 20 25 ms. Instead of using a three-wire version of RS232C, the system can also com- municate through a 20 mA current loop interface. The communications speed is switch selectable from 300 baud to 9600 baud. (Allen-Bradley Industrial Automation Products, Denbigh Road, Bletchley, Milton Keynes MK1 I EP, UK. Tel."(0908) 71144. Telex: 82396) 6301s in loop control Twin CMOS 8-bit 6301 s form the microprocessor base of the 221 pro- grammable loop controller from UK firm Field Electronics. The 221 is designed to drive a loop of input or output units in an industrial system. The controller has three switchable serial ports (20 mA). Two are for connection to another 221, a host computer or peripherals, eg a printer. One of these can be configured as an RS232C interface to a modem. The third switchable port drives a loop of Field Electronics' Digital Data Units. These units can be used for data logging, monitoring and control. A typical configuration contains one analogue datalogger and six multiplex units, or one digital alarm logger and six digital input units. There is also a 38.4 kbaud serial port. This drives a twin 5¼-in floppy disc drive or a video adaptor for VDU or TV display. The 16 kbyte RAM is expandable to 32 kbyte. 266 microprocessors and microsystems

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Page 1: Electronic circuit design software goes on $150 micro

Electronic circuit design so,ware goes on $150 micro

Users of the Sinclair Spectrum $150 com- puter can take up computer-aided design on their machines with the Analyser program from UK-based Number One Systems. Priced at £35 ($52) in the UK, the program cassette is mainly for educational and indus- trial research use, where the short- comings of the 48k memory and games resolution graphics for such an application are less significant.

The Analyser program evaluates the performance of electronic circuits. It analyses amplifier and filter circuits. Circuits of up to 16 nodes and 60 components can be analysed for input impedance, output impedance and gain (magnitude and phase) at linearly or logarithmically spaced frequencies. Resistors, capacitors, inductors, trans- formers, op amps, bipolar and field- effect transistors can be simulated.

The program was originally written for UK computers BBC Model B and Newbrain. Over 300 copies for these computers have been sold, 80% in the UK and the rest to countries in main- land Europe and Australasia as well as to

Electronic circuit simulation on a home computer

India and the USA. centres. Number One Systems says it A quarter of the sales were to is confident that the Spectrum

colleges and schools, three quarters to Analyser will be equally popular with industrial research and development students and junior engineering staff.

8085-based industrial control panel uses voice, sight and touch technology with RS232 Operators of the Bulletin 2700 intelli- gent panel system can communicate by voice, sight and touch with the machine or process being controlled.

Made in the UK by Allen-Bradley

UK-built intelligent pane/

Industrial Automation Products, the 808S-based system is for use with pro- grammable controllers and computers in industry.

The Bulletin 2700 is matched to a particular application by a combina- tion of plug-in modules. A four-module system needs at most three wires for communication with its host control- ler. This means that the Bulletin 2700 system starts more quickly than most comparable systems, says Allen-Bradley, a typical time being 20 25 ms.

Instead of using a three-wire version of RS232C, the system can also com- municate through a 20 mA current loop interface. The communications speed is switch selectable from 300 baud to 9600 baud. (Allen-Bradley Industrial Automation Products, Denbigh Road, Bletchley, Milton Keynes MK1 I EP, UK. Tel." (0908) 71144. Telex: 82396)

6301s in loop control Twin CMOS 8-bit 6301 s form the microprocessor base of the 221 pro- grammable loop controller from UK firm Field Electronics. The 221 is designed to drive a loop of input or output units in an industrial system.

The controller has three switchable serial ports (20 mA). Two are for connection to another 221, a host computer or peripherals, eg a printer. One of these can be configured as an RS232C interface to a modem.

The third switchable port drives a loop of Field Electronics' Digital Data Units. These units can be used for data logging, monitoring and control. A typical configuration contains one analogue datalogger and six multiplex units, or one digital alarm logger and six digital input units.

There is also a 38.4 kbaud serial port. This drives a twin 5¼-in floppy disc drive or a video adaptor for VDU or TV display.

The 16 kbyte RAM is expandable to 32 kbyte.

266 microprocessors and microsystems