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TRS-80 Model 4, 1983 non-gate array version. Tandy Corporation introduced the TRS-80 Model 4 on April 26, 1983 as the successor to the TRS-80 Model III.The Model 4 has a faster Z80A 4 MHz CPU, [5] larger video display of 80 columns by 24 rows, bigger keyboard, and can be upgraded to 128KB of RAM.
Video random-access memory (VRAM) is dedicated computer memory used to store the pixels and other graphics data as a framebuffer to be rendered on a computer monitor. [1] It often uses a different technology than other computer memory, in order to be read quickly for display on a screen.
Memory: 64 KB RAM, 16 KB video RAM; 32 KB ROM Expansion: 3 internal slots, 1 cartridge slot, and a 62.5 kbit/s half-duplex serial bus called AdamNet. Both the stand-alone and expansion-module versions also have an external expansion port of the same type as the ColecoVision expansion port, on the right hand side.
Each sprite is either 8×8 or 16×16 pixels and can be scaled 2× to 16×16 or 32×32. 16 KB of RAM is provided for the Video Display Processor. VDP RAM is the largest block of writeable memory in the unexpanded TI-99/4A architecture, and is used for storing disk I/O buffers and TI BASIC user programs.
The original IBM CGA graphics card was built around the Motorola 6845 display controller, [2] came with 16 kilobytes of video memory built in, and featured several graphics and text modes. The highest display resolution of any mode was 640 × 200, and the highest color depth supported was 4-bit (16 colors).
The controller can then continue to use the DRAM port for drawing objects on the display. Meanwhile, the controller feeds a clock called the shift clock (SCLK) to the VRAM's video port. Each SCLK pulse causes the VRAM to deliver the next data [computing] in strict address order, from the shift register to the video port. For simplicity, the ...
Moreover, if a mainboard has a dual-or quad-channel memory subsystem, all of the memory channels must be upgraded simultaneously. 16-bit modules provide one channel of memory, while 32-bit modules provide two channels. Therefore, a dual-channel mainboard accepting 16-bit modules must have RIMMs added or removed in pairs.
It was also used in a few MSX1 computers, in a configuration with 16kB VRAM. The Yamaha V9938, also known as MSX-Video or VDP (Video Display Processor), is the successor of the Texas Instruments TMS9918 used in the MSX1 and other systems.