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Motorola 6845 CRT controller. 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 6502.
A Charlieplexed digital clock which controls 90 LEDs with 10 pins of a PIC 16C54 microcontroller.. Charlieplexing (also known as tristate multiplexing, reduced pin-count LED multiplexing, complementary LED drive and crossplexing) is a technique for accessing a large number of LEDs, switches, micro-capacitors or other I/O entities, using relatively few tri-state logic wires from a microcontroller.
The original IBM MDA was an 8-bit ISA card with a Motorola 6845 display controller, 4 KB of RAM, a DE-9 output port intended for use with an IBM monochrome monitor, and a parallel port for attachment of a printer, avoiding the need to purchase a separate card.
Addressable lines per field 8-bit lsb 7: Bits 7–4: Addressable lines per field 4-bit msb Bits 3–2: Aspect ratio: 00 = 4∶3 01 = 16∶9 10 = 16∶10 11 = 15∶9 Bits 1–0: 00 = reserved 8: Bit 7: 0 = reserved Bits 6–5: Preferred vertical rate: 00: 50 Hz 01: 60 Hz 10: 75 Hz 11: 85 Hz Vertical rate bitmap Bit 4: 50 Hz CVT Bit 3: 60 Hz CVT ...
The 3-3-2 bit RGB use 3 bits for each of the red and green color components, and 2 bits for the blue component, due to the human eyes having lesser sensitivity to blue. This results in an 8×8×4 = 256-color palette as follows: This palette is used by: The MSX2 series of personal computers; Palette 4 of the IBM PGC; Extended Graphics Array (XGA)
A 16×2-character dot-matrix display, where each character is made from a grid of 5×7 dots. A dot-matrix display is a low-cost electronic digital display device that displays information on machines such as clocks, watches, calculators, and many other devices requiring a simple alphanumeric (and/or graphic) display device of limited resolution.
44-pin cartridge/expansion port 64K addressable ... 2 x 9-pin controller connectors ... and made Intellivision for PC Volume 1 available as a free download ...
It was most common on the IBM PC (with CGA graphics), [4] TRS-80 Color Computer, [5] Apple II [6] and Atari 8-bit computers, [1] and used by the Ultima role-playing video games. [6] Software titles (such as King's Quest for the IBM PC) usually provided an option to select between "RGB mode" and "Color Composite mode". [7]
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