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386 motherboard using the UMC UM82C491F chipset - MAME machine

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um82c491f
386 motherboard using the UMC UM82C491F chipset
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GAME SYSTEM CHD BIOS DEVICE PARENT CLONE MECHANICAL SCREENLESS

Main data
Romset and name:
um82c491f 386 motherboard using the UMC UM82C491F chipset
Short name:
386 motherboard using the UMC UM82C491F 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 I386
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:

    386 motherboard using the UMC UM82C491F chipset © 199? Unknown

    The 82C491F was designed to be the sophisticated core for high-end 386DX desktop systems. It moved UMC away from the purely budget-focused designs of the 481-series and introduced more advanced memory and cache orchestration. It is frequently seen on motherboards that were marketed as "386DX/40 Performance Boards."

    TECHNICAL
    Role: Northbridge (System Controller).

    Cache Management: Integrated logic for Direct-Mapped Write-Through or Write-Back cache. This was the key "performance jump" over the 481 series, allowing the chipset to effectively manage L2 cache latency on faster 386DX-40MHz CPUs.

    Memory Controller: Capable of handling significantly tighter memory timings (Interleaved Page Mode). It was known for its ability to accept standard 30-pin SIMMs in diverse configurations without the constant parity-error issues plaguing competing budget chipsets.

    System Bus: Primarily ISA-based, but because of its efficient design, it was often the chipset chosen by motherboard manufacturers who wanted to add a VESA Local Bus (VLB) slot to their late-model 386 systems.

    TRIVIA
    Pin Compatibility: The 82C491F was noted for being pin-compatible with some later UMC 486-class chipsets (like the 8491), which made it very popular for manufacturers who wanted to design a single "base" PCB layout and then decide whether to ship it as a 386 or a 486 board simply by swapping the CPU socket and this Northbridge chip.

    CONTRIBUTE
    Edit this entry: https://www.arcade-history.com/game/235601/?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:
um82c491f
Title:
386 motherboard using the UMC UM82C491F chipset
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