2021年5月15日 · Use the 6845 CRT controller chip. Drive a VGA monitor (640 x 480 resolution). Support 115.200 baud (other baud rates are a nice extra). Minimally support 80 characters on 25 lines. Have a usable subset of the ANSI/VT100 standard. Support colour. Use a PS/2 keyboard (a PS/2 mouse would be a nice extra).

2021年5月16日 · The RGB DAC. Originally, the design had fixed resistor values for the RGB DAC. When testing the terminal on various monitors, it was noticed that different intensity of the same colour was sometimes barely distinguishable (depending of which monitor I used).

The Motorola 6845, or MC6845, is a display controller that was widely used in 8-bit computers during the 1980s. [1][2] Originally intended for designs based on the Motorola 6800 CPU and given a related part number, it was more widely used alongside various other processors, and was most commonly found in machines based on the Zilog Z80 and MOS 6...

2019年10月1日 · This document describes the two chips involved in the video output of Amstrad CPC computers. The two chips are CRTC (HD6845) and Gate Array (40010). CRTC is responsible for generating CRT timings and memory addresses, and Gate Array does conversion from data to RGB signals along with other CPC specific tasks.

2011年12月28日 · One way might be to have a proper (resistor ladder) DAC and store the correct sync pulses in a ROM. A truly compliant signal would also be interlaced, which might not be ideal for computer monitor use and introduces some additional complications.

an CRT display. It is intended for use in MPU-based con trollers for CRT terminals in stand-alone or cluster. configurations. The CRTC is optimized for the hardware/software balance required for maxi. um flexibility. All keyboard functions, reads, writes, cursor movements, and …

2019年5月13日 · I'm curious about how graphics were drawn on systems using the Motorola 6845. I understand this was used in the CGA? If so, did the 6845 really work bitwise, was the bitwise graphics entirely separate, or did they use changing character sets on the fly to represent different patterns?

2024年9月7日 · " 6845 crt控制器是8位时代的标志性设备，主要用于将微处理器的信号转换为控制阴极射线管（crt）显示器的视频定时、内存刷新地址、光标和光笔脉冲信号。

2022年11月13日 · The second video starts to build out the video controller with the Motorola 6845 compatible CRTC to generate the Vertical and Horizontal Sync outputs and a simple resistor video Digital Analogue Converter (DAC) to generate VGA compatible Red Green Blue signals.

2017年9月3日 · The MC6845 was used in the Acorn BBC Micro, the Amstrad CPC and the IBM PC MDA and CGA video adapters. The MC6847 was used in the Tandy TRS-80 [Model 1], the Acorn Atom, the Tandy Color Computer, the Dragon 32, and the V-Tech Laser 200. Some companies made their own custom video chips and didn't allow anyone else use them.