VOGONS


First post, by RiP

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I've just noticed that the onboard IDE controller of ATC-1415 has poor speed:
https://i.imgur.com/1VtXEok.jpg

After plugging the VT6421A PCI IDE card:
https://i.imgur.com/y7ZjUsp.jpg

The BIOS version is 3.30 running Win98SE with 32MB of FPM RAM + AMD 5x86 😕

Reply 3 of 11, by Deksor

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Have you enabled DMA mode in Windows 95 ? (you need OSR2+ to do that)

Also, I think the chipset can have a driver to improve speed a little bit, but I'm not sure it's compatible with 95 (only DOS and Windows 3.1).

But UMC's IDE implementation isn't as good as SiS' implementation on their late PCI 486 chipset.
SiS supports PIO4, UMC supports PIO3 at best. (And no it's not connected to the ISA bus as far as I know, thankfully)

Reply 4 of 11, by derSammler

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RiP wrote:

I thought ISA bus speed should be about 8-16MB/s 😕

ISA is theoretically able to transfer 16.6 MB/s at most, but that's just a figure. IDE over ISA never reached speed even close to that.

RiP wrote:

PCI-to-ISA-Bridge with IDE. That's quite unambiguous to me.

Reply 5 of 11, by RiP

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Deksor wrote:
Have you enabled DMA mode in Windows 95 ? (you need OSR2+ to do that) […]
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Have you enabled DMA mode in Windows 95 ? (you need OSR2+ to do that)

Also, I think the chipset can have a driver to improve speed a little bit, but I'm not sure it's compatible with 95 (only DOS and Windows 3.1).

But UMC's IDE implementation isn't as good as SiS' implementation on their late PCI 486 chipset.
SiS supports PIO4, UMC supports PIO3 at best. (And no it's not connected to the ISA bus as far as I know, thankfully)

I'm using Win98SE.

Reply 7 of 11, by RiP

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Deksor wrote:

Well it's the same, have you enabled dma mode in 98 ? You have to go in the device manager and go to the hdd's properties to enable it.

There's no DMA checkbox for it since the chipset doesn't support DMA at all.

Reply 8 of 11, by RiP

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Deksor wrote:

SiS supports PIO4, UMC supports PIO3 at best. (And no it's not connected to the ISA bus as far as I know, thankfully)

It seems you're right:

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Reply 10 of 11, by RiP

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This board can't overclock AMD 5x86 at all...

arteq wrote:

sorry for off topic
could you please take a photo of motherboard (area with voltage regulator ) ? thank you in advance

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