6845 CRT CONTROLLER PDF

The MC CRT Controller performs the interface to raster scan. CRT displays. It is intended for use in processor-based controllers for. CRT terminals in. The MC CRT controller performs the interface between an MPU and a raster -scan CRT display. It is intended for use in MPU-based controllers for CRT. The Cathode Ray Tube Controller (CRTC) is a programmable IC used to generate video displays. This IC is used in a variety of computers including the.

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His capstone project was a based computer which could record and playback audio, as well as display waveforms on a CRT. It was a bare tube, so the heavy cardboard box it shipped in was repurposed as a case. It would only take a bit of hacking to bring that up. But what would replace the microprocessor? As one might imagine, the entire system was much slower than running a real When limiting his video RAM writes to the vertical retrace period, the screen shown at the top of this post took a full 40 seconds to display.

The Modern Retrocomputer: An Arduino Driven CRT Controller | Hackaday

Too slow for any practical use, but good enough to prove the system worked. Interested in classic video controllers? So if I understand correctly, modern electronics can do in 40seconds what a 30 year old processor can do in a split second? The slow speed is due to the shortcomings of a particular design. If he employed custom hardware to drive it, it probably would be much faster. If he stepped up from the ATmegap to a ATmeag or ATmega then he would have enough pins to run it straight off the micro and be much faster.

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The chip he used is 20MIPs and would likely be faster than the original Obviously one could write firmware for a modern micro running at an appropriate speed to replace the at speed.

That being said his goal was to just get the display system running. An Arduino apparently was the easiest solution just to make it display something. He hacked what he HaD! The was one of the first chips I got to grips with. It was at the heart of the Acorn Atom as I recall … http: Actually the Acorn Atom used the https: It was used in a few other machines, e.

The two ICs were quite different. The was intended for a specific use, and thus limited, while the was a more general controller, with wider potential. You needed more hardware with the latter, but you could configure it endlessly, so it could generate all kinds of sync frequencies, and thus saw wide use. I veroboarded a display, and wrote the machine code entered in hex from a serial terminal, no assembler for a Signetics system probably 35 years ago!

Then did a board using anot thefor a core based system. Boy, how things have changed!

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I too used to play with a I found if you left the input pins Unterminated in the bread board and stuck in a few wires sticking up in the air like a thermin you could get a controlleer of charachters on the screen that would change in swirling patterns as you ran your hands over the flying leads.

Then a few days later I found all the parts in an anti static bag and a missing bread board. Somebody needed to use it vontroller actual work.

The Modern Retrocomputer: An Arduino Driven 6845 CRT Controller

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By using our website and services, you expressly agree to the placement ctt our performance, functionality and advertising cookies. But it is good to see that the old CRT is shining again, well done. Leave a Reply Cancel reply Enter your comment here Fill in your details below or click an icon to log in: Email required Address never made public.