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The effective screen resolution in this mode is 320 × 200 pixels (a pixel aspect ratio of 1:1.2.) The card has sufficient video RAM for eight different text pages in this mode. The difference between these two modes can only be seen on a composite monitor, where mode 0 disables the color burst, making all text appear in grayscale.
A BIOS Color Attribute is an 8 bit value where the low 4 bits represent the character color and the high 4 bits represent the background color. The name comes from the fact that these colors are used in BIOS interrupts, specifically INT 10h, the video interrupt. When writing text to the screen, a BIOS color attribute is used to designate the ...
RAM was still expensive, costing tens of thousands of dollars per megabyte., [6] and to display a two-color playfield on a 80×48 display would have cost thousands of dollars in memory. [4] On a conventional NTSC color television , maximum resolutions generally fell between 256 and 320 pixels per line, and 192 to 240 lines per screen.
1024 nybbles [86]: 262 color RAM (memory allocated for screen color data storage) [101] Expandable to 320 KB with Commodore 1764 256 KB RAM Expansion Unit (REU); although only 64 KB directly accessible; REU used mostly for the GEOS. REUs of 128 KB and 512 KB, originally designed for the C128, were also available, but required the user to buy a ...
Tandy/Radio Shack TRS-80 Model I. In the mid-1970s, Tandy Corporation's Radio Shack division was a successful American chain of more than 3,000 electronics stores. Among the Tandy employees who purchased a MITS Altair kit computer was buyer Don French, who began designing his own computer and showed it to the vice president of manufacturing John V. Roach, Tandy's former electronic data ...
The T/S 1500 was an upgraded T/S 1000 with a better keyboard and 16 KB RAM, introduced in 1983. [8] [9] Timex Sinclair (TMX Portugal) designed the T/S 1500 and offered it to the Timex Corporation. The design utilized the T/S 2000 prototype (ZX Spectrum-like) silver cases that weren't previously used because of the launch of the T/S 2068.
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TI-99/2, [44] a 4K RAM, 32K ROM computer with no color, sound, or joystick port and a Mylar keyboard. TI designed the computer in four and a half months to sell for under $100 and compete with the Sinclair ZX81 and Timex Sinclair 1000. Based on the TMS9995 CPU running at 10.7 MHz and with a built-in RF modulator, performance greatly increased ...