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Motorola uses high-density Si-gate CMOS
PiHyback memory Hitachi has designed a single-chip microcomputer that accepts external program memory in an integral 28pin socket, piggyback style. The HD63POSYO is an 8-bit CMOS device. It has no onchip ROM, but can address up to 8 kbyte of EPROM mounted on the socket. The package includes 256 byte of RAM and 55 I/O lines (32 bidirectional, seven input and 16 output). One of the onchip timers is an 8-bit device with a 7-bit prescaler. The other is a 15-bit timer. There are three modes of operation: wait, stop and standby. Six types of interrupt are supported. (Hitachi Electronic Components (UK) Ltd, Hitec House, 22•-225 Station Road, Harrow, Middx HA1 2XL, UK. Tel: 01-861 1414. Telex: 936293 HITEC G)
Processor boards are Unix V compatible Processor and memory management boards for systems using Unix system V have been introduced by US firm Cromemco. The 68000-based XPU processor board supports 128 vectored interrupts and three further interrupt levels for I/O, bus fault and power failure conditions. The XMM memory manager allows demand paging memory management. Each memory reference is checked to define user access privileges and to isolate programs in memory from each other, says Cromemco. Up to 1 6 M b y t e of error-correcting RAM can be handled. The X M M can switch context definitions for 16 different users. Logical memory spaces can be mapped onto physical RAM in 4 kbyte pages. The two boards have been built into Cromemco's two new lines of supermicrocomputers, the system 100 and system 300 series. Each series comprises four models. Up to 16 users can be accommodated at one time, says Cromemco. (Cromemco Inc., 280 Bemardo Avenue, Mountain View, CA 94039, USA)
446
Switches have di zlm Wr.s for lawMomentary push-on switches in fives sizes and various outlines have been produced by Panasonic in the UK. The direct-action diaphragm type is aimed at low-profile applications. The series, designated the 'lighttouch' series, also includes a version
Panasonic 'light-touch' switches
use
with a very thin knob. There are further models with standard shafts to take separate knobs. The switches come in sizes of 5 m m X 5 m m 6mmX6mm~ 8 mm X 8 mm, 10 mm • 10 mm, or 12 m m X 12 m m Basic ratings are 30 V DC and 20 mA for the two larger types, and 15 V DC and 20 mA for the smaller types. The switches will withstand 250 VAC for I rain, says Panasonic. Contact resistance quoted is 50 m£~ while the specified insulation resistance is over I 0 0 M~Q at 100 V DC; the specifications also include an operating temperature range from --20~C to +70°C and an operating force of 130 +Z 40 gL (Panasonic Industrial (UK) Ltd, 280290 Bath Road, Slough, Berks SL1 6JG, UK. Tel: (0753) 73181)
Motorola uses Imi -dumity SiMotorola has announced its first microcomputer made in highdensity silicon-gate CMOS. The MC68HCOSC4 has 4144 byte of ROM, 176 byte of RAM and 24 bidirectional I/O lines. Also introduced is the serial peripheral interface (SPI) for communications between ICs in a single system. This synchronous system provides up to four lines for interconnecting ICs: data out, data in, clock and chip enable. I/O protocols for SPI can be obtained for the MC68HCI5C4. The MC68HCO4P2 and MC68HCO4P3 are 8-bit single-chip computers (SSCs). Made in HCMOS, they have 32 byte and 1024 byte of RAM respectively, and 1024 byte and 1696 byte of user ROM respectively. There is a 72 byte ROM for lookup tables too. 20 TTL/CMOScompatible bidirectional I/O lines are provided. Each operates from a 2-6 V supply. Motorola has also released seven CMOS peripheral devices. These include two 8-bit serial static RAMs, organized as 128-word (MC6BHC68R1) or 256-word (MC68HC68R2) by 8-bit; a realtime clock with RAM and power sense/ control (the MC68HC68T1); an HCMOS 10-bit analogue-to-digital
converter ( M C 6 8 H C 6 8 A t ) with onchip Schmitt oscillator clock input; an 8-bit mk:roprocessor unit (MC146805E3) with 64k memory addressing; and two asynchronous communications interface adapters (MC68HC51 and MC68HC53) which provide a program-controlled interface between 8-bit micro~ processor-based systems, seriaI communication data sets and modems. As well as components, the firm has produced a VM E starter kit with three VME bus boards and a set of software development tools on 8-in floppy discs. The MVME315 KIT can control 51/4-in or 8-in floppy disc drives. The package includes a screen editor, a structured macro assembler (68000), linkage editor and ROM-based monitor/debugger. The price of the kit is £2350. Negotiations between RELMS of California and Motorola have resulted in the development of a cross-support package to link Motorola's 14DS-200 realtime emulator with an Intel development computer. Users can develop software for 6804- and 6805-based systems. (Motorola Semiconductor Products Sector, 88 Tanners Drive, Blakelands, Milton Keynes MK14 5BP, UK. Tel: 07-902 8836)
microprocessor's and microsystems
Processor boards are Unix V compatible Processor and memory management boards for systems using Unix system V have been introduced by US firm Cromemco. The 68000-based XPU processor board supports 128 vectored interrupts and three further interrupt levels for I/O, bus fault and power failure conditions. The XMM memory manager allows demand paging memory management. Each memory reference is checked to define user access privileges and to isolate programs in memory from each other, says Cromemco. Up to 1 6 M b y t e of error-correcting RAM can be handled. The X M M can switch context definitions for 16 different users. Logical memory spaces can be mapped onto physical RAM in 4 kbyte pages. The two boards have been built into Cromemco's two new lines of supermicrocomputers, the system 100 and system 300 series. Each series comprises four models. Up to 16 users can be accommodated at one time, says Cromemco. (Cromemco Inc., 280 Bemardo Avenue, Mountain View, CA 94039, USA)
446
Switches have di zlm Wr.s for lawMomentary push-on switches in fives sizes and various outlines have been produced by Panasonic in the UK. The direct-action diaphragm type is aimed at low-profile applications. The series, designated the 'lighttouch' series, also includes a version
Panasonic 'light-touch' switches
use
with a very thin knob. There are further models with standard shafts to take separate knobs. The switches come in sizes of 5 m m X 5 m m 6mmX6mm~ 8 mm X 8 mm, 10 mm • 10 mm, or 12 m m X 12 m m Basic ratings are 30 V DC and 20 mA for the two larger types, and 15 V DC and 20 mA for the smaller types. The switches will withstand 250 VAC for I rain, says Panasonic. Contact resistance quoted is 50 m£~ while the specified insulation resistance is over I 0 0 M~Q at 100 V DC; the specifications also include an operating temperature range from --20~C to +70°C and an operating force of 130 +Z 40 gL (Panasonic Industrial (UK) Ltd, 280290 Bath Road, Slough, Berks SL1 6JG, UK. Tel: (0753) 73181)
Motorola uses Imi -dumity SiMotorola has announced its first microcomputer made in highdensity silicon-gate CMOS. The MC68HCOSC4 has 4144 byte of ROM, 176 byte of RAM and 24 bidirectional I/O lines. Also introduced is the serial peripheral interface (SPI) for communications between ICs in a single system. This synchronous system provides up to four lines for interconnecting ICs: data out, data in, clock and chip enable. I/O protocols for SPI can be obtained for the MC68HCI5C4. The MC68HCO4P2 and MC68HCO4P3 are 8-bit single-chip computers (SSCs). Made in HCMOS, they have 32 byte and 1024 byte of RAM respectively, and 1024 byte and 1696 byte of user ROM respectively. There is a 72 byte ROM for lookup tables too. 20 TTL/CMOScompatible bidirectional I/O lines are provided. Each operates from a 2-6 V supply. Motorola has also released seven CMOS peripheral devices. These include two 8-bit serial static RAMs, organized as 128-word (MC6BHC68R1) or 256-word (MC68HC68R2) by 8-bit; a realtime clock with RAM and power sense/ control (the MC68HC68T1); an HCMOS 10-bit analogue-to-digital
converter ( M C 6 8 H C 6 8 A t ) with onchip Schmitt oscillator clock input; an 8-bit mk:roprocessor unit (MC146805E3) with 64k memory addressing; and two asynchronous communications interface adapters (MC68HC51 and MC68HC53) which provide a program-controlled interface between 8-bit micro~ processor-based systems, seriaI communication data sets and modems. As well as components, the firm has produced a VM E starter kit with three VME bus boards and a set of software development tools on 8-in floppy discs. The MVME315 KIT can control 51/4-in or 8-in floppy disc drives. The package includes a screen editor, a structured macro assembler (68000), linkage editor and ROM-based monitor/debugger. The price of the kit is £2350. Negotiations between RELMS of California and Motorola have resulted in the development of a cross-support package to link Motorola's 14DS-200 realtime emulator with an Intel development computer. Users can develop software for 6804- and 6805-based systems. (Motorola Semiconductor Products Sector, 88 Tanners Drive, Blakelands, Milton Keynes MK14 5BP, UK. Tel: 07-902 8836)
microprocessor's and microsystems