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386sx motherboards using the OPTi 82C291 chipset - MAME machine

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op82c291
386sx motherboards using the OPTi 82C291 chipset
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GAME SYSTEM CHD BIOS DEVICE PARENT CLONE MECHANICAL SCREENLESS

Main data
Romset and name:
op82c291 386sx motherboards using the OPTi 82C291 chipset
Short name:
386sx motherboards using the OPTi 82C291 chipset
Manufacturer:
-
Year:
199?
Genre:
Computer
Category:
Computer / Business - Terminal
Serie:
-
Driver source:
pc/at.cpp
Language:
Similar games:
Input / Controls
Players:
Only one supported
Input:
Mouse, Keyboard
Buttons / keys:
108
Coins:
0
Cabinet:
-
Free-play:
Not supported

Rankings
Average user rating:
AntoPISA BestGame:
-
MASH All-Time:
-
Video
Display:
640x480@60.054866 Hz, CRT 31kHz
Orientation:
Horizontal
Scrolling:
Unknown
Colors:
-
CPU:
AM9517A, Intel 8042AH, Intel 8051, Intel I386SX
Audio
Sound:
4 audio channel
Audio chips:
Filtered DAC, Floppy sound, Speaker
Romset
First release:
Mame 0.215 released on oct-30 2019
Last release:
Mame 0.289 released on jul-31 2026
Clone of:
ibm5170 PC/AT 5170
Bios:
Not required
Use rom of:
-
Use sample of:
-
Previous romset:
None
New romset:
None
Files
Dump:
GOOD
Required files:
Romset:
Status
OVERALL:
PRELIMINARY
Emulation:
Preliminary
Graphic:
Imperfect
Color:
Good
Sound:
Good
Cocktail:
Good
Protection:
Good
Save state:
Not supported
Additional info
  • History
  • Info
  • Score
  • PCB
  • Commands
  • Init
  • Driver
  • XML
  • Motherboard:

    386sx motherboard using the OPTi 82C291 chipset © 199? Unknown

    The 82C291 was designed to provide a highly integrated, cost-effective platform for 386SX and Cyrix 486SLC processors. Unlike budget-focused SX chipsets that used simple write-through cache strategies, the 82C291 featured an integrated write-back cache controller, which significantly improved memory throughput and reduced CPU wait states.

    TECHNICAL
    System Controller: 82C291 (160-pin PQFP).

    Peripheral Controller: Typically paired with the 82C206 (IPC) to manage DMA, interrupt controllers, and system timers.

    Processor Support: Optimized for the 386SX or Cyrix 486SLC at speeds ranging from 16MHz up to 33MHz (and sometimes 40MHz in overclocked/enthusiast configurations).

    Cache: Supported direct-mapped Write-Back cache with programmable sizes (16KB, 32KB, 64KB, or 128KB), which was a premium feature for the 386SX segment.

    Memory: Supported up to 16MB of DRAM in page mode, with advanced options like "Hidden Refresh" and support for shadow RAM for both system and video BIOS.

    Bus Interface: Standard 16-bit ISA (AT Bus) with synchronous clock-dividing options for peripheral stability.

    TRIVIA
    The "SXWB" Branding: OPTi marketed this chipset as the "SXWB" solution to bridge the performance gap between the 386SX's 16-bit external bus and the demands of newer 32-bit software. By offloading write operations to a local SRAM cache, it allowed an SX system to compete with entry-level 486DX systems in certain computing tasks.

    CONTRIBUTE
    Edit this entry: https://www.arcade-history.com/game/240479/?o=2
    Information provided by © Alexis Bousiges
    Information provided by Contribute to the translation
  • Information provided by
    Information provided by / © Copyright of Fujix
  • Information provided by
  • Information provided by
  • Information provided by Fabricio Coroquer, revisited from the work of
    NOTICE: The short version was discontinued in November 2019
  • Information provided by Contribute
  • Information provided by
  • Information provided by
Dip-switches:
Cheats:
Ports:
Devices refs:
Media options:
RAM options:
Software lists:
Link:




If you notice any inaccuracy or error, please report

Data updated on july 31 2026


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Romset:
op82c291
Title:
386sx motherboards using the OPTi 82C291 chipset
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