- Email: [email protected]
Communications boards from Motorola…
Intel boosts performance
prices). The devices are now available in limited quantities for customer sampling. (Intel Corporation, 3065
Intel has announced two developments to extend the performance range of its devices. The first is a fast 16-bit CPU, the 8086-2, for the MCS-86 microprocessor system components family. The 8086-2 uses HMOS II technology and has an 8 Mhz clock rate. The second is a 32-kbit EPROM, the 2732A, based on HMOS-E technology. It operates at maximum access times down to 200 ns. This supports the 210 ns requirements of the 8086-2 CPU in systems with up to I Mbyte of memory.
Total system support is also available for the 8086-2 since all bipolar bus support, LSI peripheral and dynamic and static memory devices usable with the standard 5MHz 8086 can also be used with the 8 MHz version. Additionally, the recently introduced 8089 I/O processor can be used in 8086-2 systems to increase I/O capabilities. The 8086-2 is available now, priced at $200, in quantities of 100. The 200 ns 2732A EPROM is priced at $570 while a 250 ns version of the 2732A is offered at $475 (single unit
Bowers A venue, Santa Clara, CA 95051, USA. Tel: (408) 987-8080)
BRAL for a PAL
expressions and set the fuse array. Decoding takes typically 2 s and when complete the PAL may be 'blown' directly. There is no requirement to punch and load tapes; the device
works directly on the machine memory.
Stag Electronic Designs has developed a programming aid for its PPX universal programmer. It permits the designer using programmable array logic devices (PALs) to write programs in Boolean equations directly into the machine using the existing CRT and keyboard for data display and input. No additional terminal is required. BRAL (Boolean Representation of Array Logic) is a design aid for any PAL application where the logic functions of the programmer device are initially defined as Boolean equations. The facility is claimed to be particularly useful for the derivation of fuse patterns for the more complex PALs, incorporating registered and arithmetic feedback when the relationship between the fuse array and the device operation s is not immediately apparent or only partially determined. Expressions are entered directly into the programmer using PAL pin numbers as variables. Users may then modify these expressions and, when satisfied, instruct the machine to decode the
(Stag Electronic Designs Ltd, Stag House, Tewin Court, Welwyn Garden City, Hertfordshire A L 7 1 VA, UK. Tel: Welwyn Garden '96) 32148)
Stag's PPX universla programmer with BRA L circuit board figured electrical interfaces for each of the four communications channels, providing maximum use of all serial cate with other multiple systems in a interfaces. It may be configured to distributive serial communications mode, appear as a data terminal or as a It offers flexible multiple communicmodem to the external communications ations channels on a single board, device. The module has separately conMicromodule M68MM07 uses
Communications boards from Motorola.. Moto¢ola Microsystems have introduced a quad communications micromodule, the M68MM07. This module, with a microcomputer module, provides a system with the capability to communi-
voI 4 no 2 march 80
75
MC6850 ACIA (asynchronous communications interface adapter) devices in its standard factory-shipped configuration but users can install MC6852 SSDA (synchronous serial data adapter) devices. Separate transmit and receive rates for each MC6850 device are possible with a large offering of 21 buffered baud rates, jumper selectable for each port from 75 baud to 11 kbaud. Other features of the M68MM07 include: •
• •
• •
three EIA buffer interfaces as options- RS232C, RD422or RS423 20 mA current loop for each port 8- and 9-bit transmission odd, even or no parity (program selectable) one or two stop bits (program selectable)
Minimum system requirements for the use of this module are a system MPU and debug capability, including DEbug, EXbug, MICRObug, or MINIbug.
(Motoro/a Ltd, Semiconductor Products Division, York House, Empire Way, Wembley, Middlesex HA 90PR, UK)
• . . and Nat Semi National Semiconductor's data communications board provides eight independently programmable RS232C channels for communications expansion on board level computers. Designated the BLC-8538, the board is based on the 2651 USART. A four-channel board, the BLC-8534; is also available from National. Both boards offer considerable flexibility in channel configuration. Under user control, each channel: can be specified either synchronous or asynchronous • can have individual data formats or parity • has 16 software-programmable baud rates up to 19.2 kbaud, or external inputs • can have special transmission functions, such as SYNC insertion or SYNC search for synchronous communications
•
can have two maskable interrupts: one input and one output • has double buffering for full-duplex transmissions • has individual parity error detection The system CPU communicates with
the board via standard 8080A/8085 memory reference and I/O commands.
(National Semiconductor (UK) Limited, 301 Harpur Centre, Horne Lane, Bedford, UK. Tel: Bedford (0234) 47147)
U A R T for microprocessor systems AMI Microsystems have announced the S 1602, a universal asynchronous receiver transmitter designed for microprocessor system applications. It requires only a single +5 V DC power supply which, compared with the +5 V and -12 V supplies required by the existing 1602 UART, greatly simplifies its inclusion in the enduser system. It is functionally and pin-for-pin compatible with the Western Digital TR1602 A/B, TR186 and Fujitsu MB8868A products.
-[he N-Channel silicon gate S 1602_ operates at up to 50 kbaud, in full or half-duplex operation, l-he device is completely programmable, with start bits automatically generated, and automatically synchronizes data and clock rates. It has a three-state output capability and is fulty TTL compatible.
(AMI Microsystems Ltd, I08A Cornmercia/Road, Swindon, Wi/tshire, L/l(. Tel: 5windon (0793) 31345 1.~: .449349)
P R O M programming with PET A hardware/software package which adds an EPROM programming function to the Commodore PET is now available from GR Electronics Limited. It allows PET users to produce custom firmware to run either on the PET itself or on other microprocessorbased systems. The programmer is for 5 V 2816 EPROMs and can be used either with the original PET 2001 or the new large keyboard version. It comprises a plug-in circuit board which uses the IEEE port for data, the user port for control lines, and takes 5 V power from the PET's own external
cassette drive. Full EPROM programruing software is supplied on cassette, with functions including read/write to and from RAM and EPROM, sequencing, verification and read./ write/modify with addresses and data in hex. An extension socket is also available for users programming EPROMs in batches. It comprises an extension lead and plinth-mounted socket which allows PROM loading and unloading to be carried out adjacent to the keyboard. (GR E/ectronics Lid, Fuiroak
House, Church Road, Newport, Gwent NPT 7E/, UK. Tel: 0633 67426)
•
76
Faster static R A M s from Intel Intel have extended their range of l k x 4 static RAMs with the addition of lower power, faster versions: 2114AL-2, 2114AL-3, 2114AL-4, 2114A-4 and the 2114A-5. Maximum access times of the 2114A family are approximately 50% lower compared with the 2114, ranging
from 120 ns for the 2114AL-2 to 250 ns for the 2114A-5. The current required by the 2114A series is also lower (approximately 40%) than the earlier devices being 40mA for the 2114AL-2, 2114AL-3 and 2114AU.4 and 70mA for the 2114A-4 and 2114A-5.
microprocessors and microsystems
prices). The devices are now available in limited quantities for customer sampling. (Intel Corporation, 3065
Intel has announced two developments to extend the performance range of its devices. The first is a fast 16-bit CPU, the 8086-2, for the MCS-86 microprocessor system components family. The 8086-2 uses HMOS II technology and has an 8 Mhz clock rate. The second is a 32-kbit EPROM, the 2732A, based on HMOS-E technology. It operates at maximum access times down to 200 ns. This supports the 210 ns requirements of the 8086-2 CPU in systems with up to I Mbyte of memory.
Total system support is also available for the 8086-2 since all bipolar bus support, LSI peripheral and dynamic and static memory devices usable with the standard 5MHz 8086 can also be used with the 8 MHz version. Additionally, the recently introduced 8089 I/O processor can be used in 8086-2 systems to increase I/O capabilities. The 8086-2 is available now, priced at $200, in quantities of 100. The 200 ns 2732A EPROM is priced at $570 while a 250 ns version of the 2732A is offered at $475 (single unit
Bowers A venue, Santa Clara, CA 95051, USA. Tel: (408) 987-8080)
BRAL for a PAL
expressions and set the fuse array. Decoding takes typically 2 s and when complete the PAL may be 'blown' directly. There is no requirement to punch and load tapes; the device
works directly on the machine memory.
Stag Electronic Designs has developed a programming aid for its PPX universal programmer. It permits the designer using programmable array logic devices (PALs) to write programs in Boolean equations directly into the machine using the existing CRT and keyboard for data display and input. No additional terminal is required. BRAL (Boolean Representation of Array Logic) is a design aid for any PAL application where the logic functions of the programmer device are initially defined as Boolean equations. The facility is claimed to be particularly useful for the derivation of fuse patterns for the more complex PALs, incorporating registered and arithmetic feedback when the relationship between the fuse array and the device operation s is not immediately apparent or only partially determined. Expressions are entered directly into the programmer using PAL pin numbers as variables. Users may then modify these expressions and, when satisfied, instruct the machine to decode the
(Stag Electronic Designs Ltd, Stag House, Tewin Court, Welwyn Garden City, Hertfordshire A L 7 1 VA, UK. Tel: Welwyn Garden '96) 32148)
Stag's PPX universla programmer with BRA L circuit board figured electrical interfaces for each of the four communications channels, providing maximum use of all serial cate with other multiple systems in a interfaces. It may be configured to distributive serial communications mode, appear as a data terminal or as a It offers flexible multiple communicmodem to the external communications ations channels on a single board, device. The module has separately conMicromodule M68MM07 uses
Communications boards from Motorola.. Moto¢ola Microsystems have introduced a quad communications micromodule, the M68MM07. This module, with a microcomputer module, provides a system with the capability to communi-
voI 4 no 2 march 80
75
MC6850 ACIA (asynchronous communications interface adapter) devices in its standard factory-shipped configuration but users can install MC6852 SSDA (synchronous serial data adapter) devices. Separate transmit and receive rates for each MC6850 device are possible with a large offering of 21 buffered baud rates, jumper selectable for each port from 75 baud to 11 kbaud. Other features of the M68MM07 include: •
• •
• •
three EIA buffer interfaces as options- RS232C, RD422or RS423 20 mA current loop for each port 8- and 9-bit transmission odd, even or no parity (program selectable) one or two stop bits (program selectable)
Minimum system requirements for the use of this module are a system MPU and debug capability, including DEbug, EXbug, MICRObug, or MINIbug.
(Motoro/a Ltd, Semiconductor Products Division, York House, Empire Way, Wembley, Middlesex HA 90PR, UK)
• . . and Nat Semi National Semiconductor's data communications board provides eight independently programmable RS232C channels for communications expansion on board level computers. Designated the BLC-8538, the board is based on the 2651 USART. A four-channel board, the BLC-8534; is also available from National. Both boards offer considerable flexibility in channel configuration. Under user control, each channel: can be specified either synchronous or asynchronous • can have individual data formats or parity • has 16 software-programmable baud rates up to 19.2 kbaud, or external inputs • can have special transmission functions, such as SYNC insertion or SYNC search for synchronous communications
•
can have two maskable interrupts: one input and one output • has double buffering for full-duplex transmissions • has individual parity error detection The system CPU communicates with
the board via standard 8080A/8085 memory reference and I/O commands.
(National Semiconductor (UK) Limited, 301 Harpur Centre, Horne Lane, Bedford, UK. Tel: Bedford (0234) 47147)
U A R T for microprocessor systems AMI Microsystems have announced the S 1602, a universal asynchronous receiver transmitter designed for microprocessor system applications. It requires only a single +5 V DC power supply which, compared with the +5 V and -12 V supplies required by the existing 1602 UART, greatly simplifies its inclusion in the enduser system. It is functionally and pin-for-pin compatible with the Western Digital TR1602 A/B, TR186 and Fujitsu MB8868A products.
-[he N-Channel silicon gate S 1602_ operates at up to 50 kbaud, in full or half-duplex operation, l-he device is completely programmable, with start bits automatically generated, and automatically synchronizes data and clock rates. It has a three-state output capability and is fulty TTL compatible.
(AMI Microsystems Ltd, I08A Cornmercia/Road, Swindon, Wi/tshire, L/l(. Tel: 5windon (0793) 31345 1.~: .449349)
P R O M programming with PET A hardware/software package which adds an EPROM programming function to the Commodore PET is now available from GR Electronics Limited. It allows PET users to produce custom firmware to run either on the PET itself or on other microprocessorbased systems. The programmer is for 5 V 2816 EPROMs and can be used either with the original PET 2001 or the new large keyboard version. It comprises a plug-in circuit board which uses the IEEE port for data, the user port for control lines, and takes 5 V power from the PET's own external
cassette drive. Full EPROM programruing software is supplied on cassette, with functions including read/write to and from RAM and EPROM, sequencing, verification and read./ write/modify with addresses and data in hex. An extension socket is also available for users programming EPROMs in batches. It comprises an extension lead and plinth-mounted socket which allows PROM loading and unloading to be carried out adjacent to the keyboard. (GR E/ectronics Lid, Fuiroak
House, Church Road, Newport, Gwent NPT 7E/, UK. Tel: 0633 67426)
•
76
Faster static R A M s from Intel Intel have extended their range of l k x 4 static RAMs with the addition of lower power, faster versions: 2114AL-2, 2114AL-3, 2114AL-4, 2114A-4 and the 2114A-5. Maximum access times of the 2114A family are approximately 50% lower compared with the 2114, ranging
from 120 ns for the 2114AL-2 to 250 ns for the 2114A-5. The current required by the 2114A series is also lower (approximately 40%) than the earlier devices being 40mA for the 2114AL-2, 2114AL-3 and 2114AU.4 and 70mA for the 2114A-4 and 2114A-5.
microprocessors and microsystems