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DMA mode

Started by NarakuITA , Jun 25 2022 07:10 AM

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19 replies to this topic

#1 NarakuITA

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Posted 25 June 2022 - 07:10 AM

I need help, as I do not understand the behavior that presents itself in front of my eyes, somewhat strange! I bought a CF-IDE40 Converter Card Module adapter with a 32GB Compact Flash CF.

Once the components and windows 95C were installed on my IBM 330 6577 machine, I enabled DMA. However I noticed something strange, windows seemed slow to start up and shut down, like applications to start up. In fact, the Compact Flash CF is slower than the mechanical disc!

The Compact Flash sees it as compatible and has allowed me to enable DMA.

So I did some tests, these are the results:

I took a look at the bios and found DMA resources. Only in Channel 2 there is System Resources, for everything else there is only the wording available.

Why this problem?

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#2 cryptodan

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Posted 25 June 2022 - 11:48 AM

Somethings may not have the ability to use dma

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#3 lti

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Posted 25 June 2022 - 07:04 PM

What drives are you using? Some CF cards are slow.

There were also a few flawed IDE controllers, but that computer appears to have IDE integrated into the chipset.

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#4 NarakuITA

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Posted 25 June 2022 - 07:07 PM

What drives are you using? Some CF cards are slow.

There were also a few flawed IDE controllers, but that computer appears to have IDE integrated into the chipset.

Scheda DI MEMORIA COMPACT FLASH CF SCHEDA 4 GB 8 GB 16 GB 32 GB 64 per Digital Camera | eBay

CF-ide40 converter card modulo-Compact Flash CF to IDE 40 PIN ADATTATORE | eBay

Edited by NarakuITA, 25 June 2022 - 07:11 PM.

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#5 NarakuITA

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Posted 25 June 2022 - 07:10 PM

I discovered in the bios in Drives and Ports I/E, that there are some settings to set for the disk.

In fact, on IDE Functionality it was set to "Compatible" I changed it to "High Performance".

These are the results (Speed has now improved, However I don't come close to 33MB/s):

There is one other feature that I haven't touched, I have no idea if it will be useful anymore: IDE Data Preload in Reading is set to Disabled.

Do you know if it is useful if I enable it?

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#6 cryptodan

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Posted 25 June 2022 - 07:18 PM

I'd enable it and see. What is the rated speed of the converter and are there other drives on the cable?

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#7 NarakuITA

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Posted 25 June 2022 - 07:22 PM

CF-ide40 converter is mounted on the primary IDE slot, the mechanical disk along with the DVD is on the secondary IDE.

Converter Specifications:

https://www.reichelt.de/card-reader-intern-ide-compact-flash-delock-91620-p57406.html?CCOUNTRY=445&LANGUAGE=de&trstct=pos_1&nbc=1&&r=1

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#8 cryptodan

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Posted 25 June 2022 - 07:33 PM

It doesn't say what the speed of the ide mode is, so it could be extremely slow. Also what dma mode is it in?

https://www.phildev.net/ata-modes.html

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#9 NarakuITA

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Posted 25 June 2022 - 07:39 PM

I found this Chinese dealer. It looks like the same product I bought in germany.

https://www.ebay.it/itm/363443074410

In the description it says:

Standard IDE interface, true-IDE mode, and support DMA-33 transfer mode.

Could I try to take this? (Or it's the same one I have. Maybe it certainly is.)

How do you control the DMA mode? I activated it and restarted the PC. In the square appears the tick is activated.

I was able to find the details of the card.

Scheda di memoria 16 GB Compact Flash scheda CF per Olympus e-30 e-520 | eBay

Maybe I should take this? A Compact Flash Card EXTREME UDMA 7?

https://www.ebay.it/itm/384470135544

Edited by NarakuITA, 25 June 2022 - 07:43 PM.

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#10 cryptodan

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Posted 25 June 2022 - 07:49 PM

Yes I would go for that faster one. Keep in mind 120 / 8 = 15megabytes a second.

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#11 NarakuITA

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Posted 26 June 2022 - 03:45 AM

Yes I would go for that faster one. Keep in mind 120 / 8 = 15megabytes a second.

That is, if I take that CF I get to a maximum of 15Mb/s?

I am asking this because currently, I am approaching a speed of 14MB/s. If I have to spend more suns just to recover 1mb/s, then I stay like that, as I am now.

Edited by NarakuITA, 26 June 2022 - 04:11 AM.

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#12 cryptodan

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Posted 26 June 2022 - 09:30 AM

Yes that is the math to determine megabytes a second since drive makers use 1000 to denote kilobytes and not 1024

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#13 NarakuITA

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Posted 26 June 2022 - 09:37 AM

I wanted to give it a try. Don't tell me why. But I installed Windows 98se and it's much more "responsive", "fast"! The disk test is pretty much the same, slightly higher, but I see that windows 98se is faster! It is noticeable when starting and shutting down windows. Programs also start faster. It is as if windows 98 handles the speed of the CF better.