resolving 360 o of mechanical rotation into 256 8-bit words. To avoid the possibility of untrue readings being made, a special control system code, Gray, is used. The sequence of binary numbers in the Gray code are arranged in such a way, that for each increment of rotation, only one of the 8 bits changes state. An interface/decoder board is supplied, which latches the Gray code output, converts it to binary and enables the code to be fed into a Pet computer via the user port. A wide variety of applications are possible in the field of position control and mechanical data logging. Cetronic Limited, Hoddesdon Rd., Stanstead Abbotts, Ware, Herts SG1 2 8EJ, England.
CIRCLE INQUIRY NO. 263
Line monitor power conditioners, Power Master, reduce electrical pollution coming through electrical power lines and branch circuits to solid state electronic equipment that is sensitive to voltage spikes and elec
trical noise. Equipment that can be protected includes minicomputers, word processors,
electronic instruments, photocopiers, cash registers, personal computers, automatic bank tellers-any electronic equipment with semiconductors that are sensitive to voltage spikes and electrical noise. SGL Waber memory expansion, mini-floppy disk inter
face for four drives, Centronics parallel printer interface, RS-232C interface and an S-1 00 bus to provide additional interface capabilities. Now the computer is capable of a number of configurations ranging from a simple low cost Ievei i I tape based system to a fully implemented word processing or business system utilizing the same software as was developed for the TRS-80 model I computers. It will run TRSDOS software as
well as other operating systems designed for TRS-80 compatibility such as NEWDOS and VTOS. Software and operating systems are available from Radio Shack and many inde
pendent software companies. The S-1 00 bus permits the addition of 1 6K or 32K memory boards. The 1 6K memory board is expandable to 32K. Other S-1 00 boards
available from independent hardware vendors may be plugged into the expander to provide special features not readily available to TRS-80 users. Price of the expander is $41 0 without memory and a n additional $245 for 1 6K or $295 for 32K memory board. Personal Micro Computers, 475 Ellis St., Mountain View, CA 94043, (41 5) 962-0220.
CIRCLE INQUIRY NO. 265
Daisy wheel printers, V300 series, include a 25 cps and 45 cps model. Both models are impact printers that produce letter quality printing using standard Diablo or Qume-type 96-character print wheels. Also, both printers can accommodate paper widths up to 1 5 inches and can print u p to 1 36 columns.
Character spacing is 1 /1 20 in. minimum, and line space Is 1 /48 in. minimum. It is furnished complete and ready to use, and offers a wide variety of interface matching capabilities. It is available with either an industry standard Centronics parallel interface or RS232-C.
Internal DIP switches can be used to select system operating parameters such as 7 or
8-bit character lengths, single or double stop bits, odd or even parity, and 300, 600, 1 200 or 2400 baud transmission speeds. A programmable vertical format unit allows users to select a maximum form length up to 66 lines with top-of-form and VT justification.
Front panel switches are provided for power on, select, and line feed, and indicators are provided for power on, on-line status, paper out and ribbon out. Either multistrlke fabric or carbon film Diablo-type cartridge ribbons may be used. The V300-25 is priced at
$ 1 ,895, and the V300-45 at $2,1 95. Vista Computer Co. , 1 31 7 Edinger Ave., Santa Ana, CA 92705, (71 4) 953-0523.
CIRCLE INQUIRY NO. 266
Dual·port dynamic RAM for general pur
pose and direct memory access applications, Top-Of-Board OMA port, allows memory access without disabling or interrupting the CPU, yielding higher effective operating
speeds. It can be software enabled or dis
abled and 1/0 bank selected. This allows the port to be dedicated to video 1/0 or disk systems while the CPU continues functioning with other memory. The versatility of the port makes It Ideal for applications in high resolu
tion graphics. The 32K memory features two independent 1 6K banks addressable on 1 6K boundaries. Software control versatility allows 1 6K, 32K, 48K, or 64K bank selection.
Other features include: transparent refresh, S-1 00 and IEEE S-1 00 compatibility, and low power consumption (7 watts maximum). The dual-port RAM allows computer speeds otherwise unattainable In applications in
volving video 1/0, disk through OMA port and multi-user time sharing systems. It also can be used as a standard 32K RAM. It is com
patible with 8080, 8085, and 4MHz Z80 CPUs without walt states. Price: $579. B&G
JUNE 1981
Computer Applications, 206 Brookside, Bryan, TX 77801 .
CIRCLE INQUIRY NO. 287
Mlnl·magnetlc disks at 5-in. diameter feature Center-Foil, a special reinforcement of the center hub of each disk that Increases disk life plus a new jacket lubrication for long wear, reliable and repeatable performance.
The Center-Foil insures stable and positive support of the disk and track alignment in the many drives used In word processing, personal computers, mini and micro com
puters and large business and Industrial data
processing systems. Also Incorporated is the Athana jacket lubrication. Custom design in the processing of the diskettes and lubri
cated jacket provides the end user maximum performance, reliability and long life. Models are available for all commonly used drives and applications. The diskettes come in a variety of packages including plastic cass
ettes, library cases and all with Athanacode, a color coordinated labeling system with color keyed index and reference Identification.
CIRCLE INQUIRY NO. 132
Athana, 2730 Monterey Ave., Torrance, CA 90503, (21 3) 775-3741 .
CIRCLE INQUIRY NO. 288
Analog 1/0 cards, OT27 42 series, are compatible with any 8-bit STO-bus micro
computer, including ST0-8085, ST0-6800,
ST0-6809 and STD-Z80. The product family is ideally suited for Industrial process control systems, automated test equipment and machinery automation. Consisting of over 50 models of data acquisition function cards (Including analog input AID, analog output D/A, input channel expansion and DC-DC con
version cards), the series Is the most com
prehensive analog 1/0 product offering available from a single manufacturer for STD
bus users. The series offers three different analog Input cards that implement the latest STO standard interrupt technique. They are the DT27 42 for high level input applications, the DT2744 for low level input applications and the DT27 45 for isolated low level Input applications. Data Translation, 1 00 Locke Dr. , Marlboro, MA 0 1 752, (61 7) 481 -3700.
CIRCLE INQUIRY NO. 288
INTERFACE AGE 1 1 7
Improved firmware for the Malibu 1 60 printer uses the MPIO communications board. Contained within a 2708 EPROM, this enhanced printer driver not only provides a fully formed character set, but it also provides the ability to print continuous graphics (no blank columns between plotted points) and proportional characters. Includes sample graphics program. Price: $50.
AArdvark Computer Solutions, San Diego, CA (71 4) 292-8338.
CIRCLE INQUIRY NO. 270
Dynamic RAM board featuring 1 28K bytes of RAM is now available from Pliceon Inc.
Designated Superstore, the board has been optimized for Alpha Micro System computers and can be configured for either 8- or 1 6-bit processors. The boards are organized as 8
At last!
blocks of 1 6K bytes, divided Into two 64K memory blocks controlled by Individual 1/0 ports. �hen used with 8-bit processors,
Money. Where does it come from?
Where does it go? How much do you
vides the answers. Quickly. Accurately.
That's it. No long dry manuals to read.
No jargon. If it isn't obvious what you need to do next, just press "?" (fol·
lowed by RETURN) and MONEY MAESTRO will lead the way. Of course we give you a manual to page through if you choose, but if you have a com·
puler and can fill out a check . . . you can run MONEY MAESTRO without opening the book.
0 descriptive brochure (free) 0 User's Manual ($20.00) 0 dealer info
I'm sold !
0 MONEY MAESTRO ($200.00) 0 8" CP/M 0 5'14 " Micropolis
0 5 'I• " Northstar CP/M SO
Payment: 0 COD 0 check enclosed amount $ ____________ _
0 Visa/Mastercharge # _______________ exp. date_ I_
Signature ---
·---"Ieday's idea . . . . . . tomorrow's utility"
Allow $3.oo Shipping & Hand l i ng (overseas: $1 0.00).
In nOS
Cal1forn1a residents add sales tax.
----�'
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1-1 1-1 8 INTERFACE AGE
be addressed in either of two ways. First, it can accept an extended 24-blt address. pro
viding 1 6-megabyte address field. Or, it can refresh Is transparent to the CPU. reducing processor overhead. The memory Is 3 MHz In either 8- or 1 6-blt systems. Access time is 330 ns. with a cycle time of 550 ns. Pliceon, 2350 Bering Dr., San Jose, CA 951 1 2.
CIRCLE INQUIRY NO. 271
Wedge-shaped enclosure In three standard widths are composed of structural foam ABS side panels designed with unique tabs molded Into the sides to facilitate mounting of PCBs or chassis. Control panels are of .080 aluminum. These units in widths of 8.5-in., 1 1 .33-in or 1 6-:in. are styled for key
board consoles and instrument enclosures in flat, vertical or hanging modes with two or more surfaces for control mountings . Present plans call for the units to be shipped unassembled and painted either light preci
sion tan, dark instrument tan or a combination
of the two colors. In 1 -4 quantities the 1 6-in.
wide unit costs approximately $40. Buckeye Stamping, 555 Marion Rd., Columbus, OH 43207, (6 1 4) 445-8433.
CIRCLE INQUIRY NO. 272
Medium resolution color monitor, Hitachi HM-1 7 1 9, features a 1 9-in. convergence free screen actuated by a proprietary in-line gun.
It provides a dot shadow mask of 0.47 pitch for Increased clarity. The unit Is designed for optimum performance at 5 1 2 by 51 2 pixels with a capability of 720(H) by 540(V) pixel resolution, which is best suited for computer graphics and process monitoring systems. It Incorporates all the standard advancements pioneered by Hitachi Including single PCB reliability, self convergent in-line gun, built-in high voltage regulator, video bandwidth of 25 MHz and long persistence phosphor. It is
available with NTSC/RGB input as one of the options. In addition to a 720 by 540 pixel resolution, no point on raster deviates from its proper position by more than 2% of raster
CIRCLE INQUIRY NO. 99
9X12 Dot Matrix with upper and lower case and graphics capability. Use with ZBO business sottware on your Apple with the ZBO soHcard
ccs S100
Assembled and tested.
MICROSOFT 16K RAMCARD
$159
Add 16K of Ram to your 48K apple. Use it to load lntger.
Applesoft or MBASIC. Perfect for use with the Z80 sottcard and
Includes: Computer, basic cartridge, programming manual, operators manual, RF Mod/Sw�ch.
CCS GPIB IEEE (488) Interface
Card MODEL # 7490
$249
Up to 15 interconnected controllers.
talkers, and/or listeners can be interfaced. Controls counters, signal generators, digital Multimeters. color graphics ETC. Includes 3 FT cable.
Self contained unit includes: Console.
CRT. Printer. Tape Recorder. Comes software on your apple. Includes card, Diskette, and manuals for writes soft-sectored diskettes fonnatted to the IBM' standards for single
and double-density diskettes, and come fully supported with Rom Ternination. card guides. Power Supply with + &· 1 6V & 4 AMPS and implement multiuser operating system such as the M P/ M . memory, Disk Controller, RS232 cable, flopy disk cables, CP/M2.2.
Integrated, tested and shipped with cables installed.
TARBELL S 1 00 BOARDS 32K Static Ram
Floppy Disk Interface $649.00 Double Density . . . . $445.00 Font capabilities. 50 million character life printhead can be replaced for less then $30. Requires parallel interface.
Epson/ Apple MXBO S100 computer. Please specify.
CCS S - 1 00 proposed STD. Features 41 16-Type d y n a m i c rams . use w i th A 4 green phosphoric screen for pleasant viewing. Perfect for new 80 by 24 INCLUDES: Power Supply, Case, Cable, and Doc