Figure 4 - uploaded by Julio Ortega
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Schematic diagram of the controller. Chips are laid out to roughly correspond to their positions on the photomask.
Source publication
An inexpensive CRT terminal controller/computer is described. The board integrates virtually any keyboard and CRT monitor
into a work station with firmware-governed intelligence. The system is designed to fill the cost/functionality niche below
the Apple microcomputer. It can be configured as a dumb or smart terminal (approximately $100 plus keyboa...
Context in source publication
Context 1
... character generator produces the appropriate dot pattern for a character in parallel and passes it to a shift register, in which it is transformed into a serial bit stream appropriate for the dot pattern required for the screen. An analog switch adds the horizontal and vertical sync with this dot pattern and thereby produces a composite video signal for a standard monitor. Figure 4 provides the schematic diagram of the controller board. It is laid out to roughly correspond with the photomask provided in Figure ...
Citations
... The system comprises a general-purpose controller and several digitally programmable analog "building blocks." This system has been designed to supersede previous systems based on generalpurpose controllers, which are more limited in the number and type of devices to be controlled, do not provide an ergonomic user interface, and/or require more supporting hardware (Dillon, Millman, Tombaugh, Ferguson, & Bezanson, 1979;Palya, Ortega, & Wilson, 1982). ...
We describe a general-purpose, programmable system that provides high-quality, low-cost devices for experimentation in psychoacoustics
and speech perception. The system is controlled by a host computer (e.g., an IBM PC), over a serial line. Through the use
of a high-level, general-purpose experiment control program, the designed interconnection of devices can be specified logically,
and the settings of the devices modified dynamically, during the experiment.
