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In the IBM PC XT upon which the PCjr is based, DRAM refresh is performed by one channel of the 8237 DMA controller, triggered by one channel of the 8253 programmable timer, while in the PCjr the 8237 is eliminated and the timer channel is repurposed (to work around a complication of other cost-cutting in the keyboard interface).
The Tandy 2000 is a personal computer introduced by Radio Shack in September 1983 based on the 8 MHz Intel 80186 microprocessor running MS-DOS. [2] By comparison, the IBM PC XT (introduced in March 1983) used the older 4.77 MHz Intel 8088 processor, and the IBM PC/AT (introduced in 1984) would later use the newer 6 MHz Intel 80286.
The RadioShack TRS-80 Color Computer, later marketed as the Tandy Color Computer, is a series of home computers developed and sold by Tandy Corporation.Despite sharing a name with the earlier TRS-80, the Color Computer is a completely different system and a radical departure in design based on the Motorola 6809E processor rather than the Zilog Z80 of earlier models.
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The Tiki 100 uses an 8-bit RGB palette (also described as 3-3-2 bit RGB), with 3 bits for each of the red and green color components, and 2 bits for the blue component. It supports 3 different resolutions with 256, 512 or 1024 by 256 pixels and 16, 4, or 2 colors respectively (freely selectable from the full 256-color palette).
The Spectravideo SV-328 is the predecessor of the MSX standard. Many MSX programs were unofficially ported to the SV-328 by home programmers. In the early 1980s, most home computers manufactured in Japan such as the NEC PC-6001 and PC-8000 series, Fujitsu's FM-7 and FM-8, and Hitachi's Basic Master featured a variant of the Microsoft BASIC interpreter integrated into their on-board ROMs.
n of 16 with Hires expansion board; 16 out of 256 logical intensities with composite interface, 16 logical colors with TTL RGB interface MZ-80K: 1979: 1000 Bytes: 40×25 Mono "Full": Limited 320x200 Mono Semi: 80×50 [69] Mono (40x25) LC, BG, SG No: None many well-chosen pseudo-graphics characters [70] KC 87, KC85/1 1987 960 bytes 87.x1: 960 ...
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