Does that pcchips M919 Ver 3.2 66MHz FSB capable?
This is a typical 486 board with all necessary element to represent the era.
This is my last collection.
My first PC (1997)
IBM 6x86mx PR200
BIOSTAR M5ATA
16MB SDRAM
Now upgraded to Cyrix MII 291.5MHz (maybe PR400)
Hi,
According to this page and the downloadable docs here it is not 66 Mhz FSB capable:
https://theretroweb.com/motherboards/s/pcchip … ch-m919-ver-3-2
"A process cannot be understood by stopping it. Understanding must move with the flow of the process, must join it and flow with it." - Dune
MagefromAntares wrote on 2026-05-16, 15:14:Hi,
According to this page and the downloadable docs here it is not 66 Mhz FSB capable:
https://theretroweb.com/motherboards/s/pcchip … ch-m919-ver-3-2
Hi,
From official PDF document, the 50MHz FSB is the cap. May be the Ver 3.2 M919 could run at 66MHz stable, from hidden jumper settings.
My first PC (1997)
IBM 6x86mx PR200
BIOSTAR M5ATA
16MB SDRAM
Now upgraded to Cyrix MII 291.5MHz (maybe PR400)
385387386 wrote on 2026-05-16, 15:40:MagefromAntares wrote on 2026-05-16, 15:14:Hi,
According to this page and the downloadable docs here it is not 66 Mhz FSB capable:
https://theretroweb.com/motherboards/s/pcchip … ch-m919-ver-3-2Hi,
From official PDF document, the 50MHz FSB is the cap. May be the Ver 3.2 M919 could run at 66MHz stable, from hidden jumper settings.
Hmm if I take a look at the first picture in your initial post, I see the same description printed on the motherboard (Right above the UMC8886BF chip) about the JP3 settings as it is in the manual, so if it has a hidden setting then it is hidden in both the manual and on the motherboard. Setting the jumpers to a setting not in the manual or the printed ones on the motherboard are always a luck thing, it might change the frequency to an undocumented one, or have unexpected and probably not beneficial results.
"A process cannot be understood by stopping it. Understanding must move with the flow of the process, must join it and flow with it." - Dune
Hi, @385387386,
This is the famous version of M919 with the "fake cache chips" i.e. no cache installed, until you install a suitable COASt module. It's not 66MHz capable, if not configured for 2x33MHz 486 CPU like DX2-66. The maximum bus frequency is 50MHz as in version 1.xx, which may have installed DIP SRAM cache chips out of the factory.
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You'll find much more about running the UM8881 at 60 MHz if you look into the similar MB-8443UUD-A. 486 board with UMC 8881E/8886B: The winner is: EDO without L2 (if your only other option is L2 at 3-2-2-2)
For 66 MHz your trouble will be finding a 486 class CPU that both a 2x multiplier and can run at 133 MHz...
Some of these had an undocumented 60mhz FSB on the clock generator, you would need to id the chip. (In this regard the 918 is a better bet)
Not saying it would be stable if it’s there.
I don't see why it wouldn't run a 66mhz fsb. While I don't have that revision I have both the one that came before it and the later v 3.4 bf and they definitely do supoort 66mhz. Obviously support of 60 and 66 was never official and some boards may do better than others.
