page_title: Tseng Labs ET4000
section_title: ET4000AX
hierarchical_section_title: Tseng Labs ET4000 / Models / ET4000AX
caption_attribution_description: Orchid ProDesigner II @ Tseng ET4000-AX
context_page_description: The Tseng Labs ET4000 was a line of SVGA graphics controller chips during the early 1990s, commonly found in many 386/486 and compatible systems, with some models, notably the ET4000/W32 and later chips, offering graphics acceleration. Offering above average host interface throughput coupled with a moderate price, Tseng Labs' ET4000 chipset family were well regarded for their performance, and were integrated into many companies' lineups, notably with Hercules' Dynamite series, the Diamond Stealth 32 and several Speedstar cards, and on many generic boards.
context_section_description: The ET4000AX was a major advancement over Tseng Labs' earlier ET3000 SVGA chipset, featuring a new 16-bit host interface controller with deep FIFO buffering and caching capabilities, and an enhanced, variable-width memory interface with support for up to 1MB of memory with a ~16-bit VRAM or ~32-bit DRAM memory data bus width.  The FIFO buffers and cache functions had the effect of greatly improving host interface throughput, and therefore offering substantially improved redraw performance compared to the ET3000 and most of its contemporaries.  The interface controller also offered support for IBM's MCA bus, in addition to an 8 or 16-bit ISA bus.  The ET4000AX could also support the emerging VESA Local Bus standard with some additional external logic, albeit with a 16-bit host bus width.
  Neither the ET4000AX or its succeeding family members offered an integrated RAMDAC, which hampered the line's cost/performance competitiveness later on.
caption: Orchid Prodesigner IIs ISA with ET4000AX
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