MZnet : mail service for personal micro-computer systems

Traditional computer mail systems involve a co-resident User Agent (UA) and Mail Transfer System (MTS) on a time-shared host computer which may be connected to other hosts ina network, with new mail posted or delivered directly through co-resident mail-slot programs. To introduce personal micro-computers (PCs) into this environment requires modification of the traditional mail system architecture. To this end, the MZnet project uses a split-slot model, placing UA programs on the PCs while leaving MTA programs on a mail relay host which can provide authentication and buffering. The split-slot arrangement might be viewed as a new protocol level which operates somewhere between the currently defined MTS-MTS and UA-UA levels

A micro-computer-based system to compute magnetic variation

A mathematical model of magnetic variation in the continental United States was implemented in the Ohio University Loran-C receiver. The model is based on a least squares fit of a polynomial function. The implementation on the microprocessor based Loran-C receiver is possible with the help of a math chip which performs 32 bit floating point mathematical operations. A Peripheral Interface Adapter is used to communicate between the 6502 based microcomputer and the 9511 math chip. The implementation provides magnetic variation data to the pilot as a function of latitude and longitude. The model and the real time implementation in the receiver are described

Whalesong

Auke Bay Micro-Computer Lab summer hours slated -- New business director thrilled with the challenge of UAJ -- Lind meets with USUAJ representatives to discuss reorganization task force -- UAJ weathers its stormiest year -- Broccoli: Patron vegetable of yuppies -- UAJ hosts guest instructors for summer -- UAJ student chosen for internship -- Social Services aids families in crisis -- Cooperative program benefits Native youth in Southeast Alask

Two Micro-Computer Based Games

In management (and control) the most important factor is a thorough knowledge of the behavior (properties, dynamics) of the managed object. In technical systems these properties can be (to a sufficient extent) formally described. In the socioeconomic system this can not be done so easily. This is where games of various kinds can convey the "feeling" of the systems behavior in a very instructive way. The two games presented in this working paper are of that kind. They show, at the same time, how one can turn the constantly extending properties of microcomputers into a greater sophistication of the game. Both games carry important messages for those who are in the process of managing common resources. This property should make this working paper useful to a wide community

Fault Test of Micro Computer

When we use a micro computer, we often find it impossible to input from the keyboard and to light the display diode.In this paper, taking the case of the KIM-1 micro computer, as an example, we tried to test each part, and could repair its function by detecting fault points.6800系のマイクロコンピュータKIM-1は比較的まとまったマイコンとして用途が広いようであるが，一旦故障するとキーボードよりの入力はできず，故障点を検出することが困難である。これはTK80系と異なってキーボード入力がR0M, RAM, SN-74145, SN-74LS145等の関係する所が多いからであって，KIM-1をテストした結果を報告する

Whalesong

Smith to travel to Regent meeting -- Micro-Computer Lab opens -- Holiday Closure -- Rational planning needed -- Special Olympics -- Whalesong Quality -- Adams-Down Syndrome Educator -- Whalesong debuts in 1976 -- Larsen; Alger strengthen UAJ Ski Team -- Student Commissioner ends term in office -- Ex-Seahawk Offensive Lineman to visit UAJ -- New Book chronicling LSD history doing well -- College officials "barnstorm" for funds -- Fergle University's mail order diplomas -- 9-1/2 Weeks - Basinger stunning -- Espresso Bars, latest in Yuppie Phenomena -- Dvorak; Keyboard innovation -- Beeton/Koester attend conferences on women's studies -- UAJ proposed in 1946 -- UAJ's Campus Security receives high marks -- Sharon Cook - "Job most enjoyable" -- NATIONAL COLLEGE NEWS SHORTS -- Classified

A micro-computer based system to compute magnetic variation

A mathematical model of magnetic variation in the continental United States (COT48) was implemented in the Ohio University LORAN C receiver. The model is based on a least squares fit of a polynomial function. The implementation on the microprocessor based LORAN C receiver is possible with the help of a math chip, Am9511 which performs 32 bit floating point mathematical operations. A Peripheral Interface Adapter (M6520) is used to communicate between the 6502 based micro-computer and the 9511 math chip. The implementation provides magnetic variation data to the pilot as a function of latitude and longitude. The model and the real time implementation in the receiver are described

Robust position control of ultrasonic motor using VSS observer

Intrinsic properties of ultrasonic motor (high torque for low speed, high static torque, compact in size, etc.) offer great advantages for industrial applications. However, when load torque is applied, dead-zone occurs in control input. Therefore, sliding mode controller, which is a nonlinear controller, is adopted for ultrasonic motor. The state quantities, such as acceleration, speed, and position are needed to apply the sliding mode controller for position control. However, rotary encoder causes quantization errors in the speed information. This paper presents a robust position control method for ultrasonic motor by using Variable Structure System(VSS) observer. The state variables for sliding mode controller are estimated by the VSS observer. Besides, a small, low cost, and good response sliding mode controller is designed in this paper by using a micro computer that is essential in embedded system for the developments of industrial equipments. The effectiveness of the proposed method is verified by experimental results