Hey, thanks.

This actually reminds me that i never updated the charts and original post with Appian ADI2 + driver.
Did it now (you will probably need to hard-reload for local cache invalidation).

It turns out that ADI2 is a great EIDE chip.
As noted in the original post - it works well with CF cards, but a bit flaky with mechanical HDDs.
The reason for that - I am testing on a highly (most) optimized VLB system and that seems to be a bit too much for it.
If i relax system timings - all is good, but at the cost of lowered performance.

I have got the DTC EDPT 32GB extension bios already running on this config:

Pentium 90Mhz classic
FiC PA-2002 motherboard
16MB EDO 60NS (got two sticks (one seems to be dead) (going to upgrade it to 48MB
15GB WD caviar 153aa
VGA Mentor Tseng Labs ET4000 / W32P 2MB PCI
UNKOWN RTL8019 Ethernet NIC 10Mbit ISA with DTC EDTP 2.2a bios ( running 16K part) Limit 32GB.
Going running windows 95 on it.. Perhaps with split Dos mode..(so windows 95 doesnt boot straight to GUI) but ending in dos prompt)

Very intersting Robin4.
I was recently thinking of trying that in a pci network board as well.

Sorry to revive an old thread, but I randomly found a EIDE Ultima Pro still in box at Goodwill, complete with a version 2.1 driver disk, newer than anything I see on Vogons Drivers. Should I attach it here?

ubertrout wrote on 2025-02-20, 02:38:

Sorry to revive an old thread, but I randomly found a EIDE Ultima Pro still in box at Goodwill, complete with a version 2.1 driver disk, newer than anything I see on Vogons Drivers. Should I attach it here?

Yes please.

As it turns out, my Unicorn ENDAT 486 has an ADI/2 chip in it.

Re: Bought these (retro) hardware today

I installed the DOS driver, tested it in speedsys and got these results:

Not bad at all...

EduBat wrote on 2026-03-17, 00:16:

As it turns out, my Unicorn ENDAT 486 has an ADI/2 chip in it. […]
Show full quote

As it turns out, my Unicorn ENDAT 486 has an ADI/2 chip in it.

Re: Bought these (retro) hardware today

I installed the DOS driver, tested it in speedsys and got these results:

The attachment 1.jpg is no longer available

Not bad at all...

Better than not bad. That’s quite nice. ADI/2 supports PIO4 and I’d say you are there. I’m assuming you gota Cyrix 66 DX2 and your drive is doing multi-sector transfers. Are you using the flex driver? Does the DOS driver report any info when it loads? Have you tried this BIOS? https://www.vogonsdrivers.com/getfile.php?fileid=2278 I should support your controller.

douglar wrote on 2026-03-17, 03:16:

Better than not bad. That’s quite nice. ADI/2 supports PIO4 and I’d say you are there. I’m assuming you gota Cyrix 66 DX2 and your drive is doing multi-sector transfers. Are you using the flex driver? Does the DOS driver report any info when it loads? Have you tried this BIOS? https://www.vogonsdrivers.com/getfile.php?fileid=2278 I should support your controller.

Thanks for highlighting that BIOS. I will try it when my programmer arrives.
Regarding the driver, I was using version 1.53 from here...
https://theretroweb.com/chips/6516
...but the flexi driver, which is version 2.14 made it even faster.

When starting, the driver says that the "Data Port Transfers are 32 bits wide" and that "Hard disk 0 utilizes MULTIPLE MODE DATA TRANSFERS"

EduBat wrote on 2026-03-17, 16:54:

...but the flexi driver, which is version 2.14 made it even faster.

Very nice. Looking at the BIOS for the board on TheRetroWeb, looks like 1/2 the rom is the VGA BIOS and the other half is for the system board. You would have to overlay the system board part of the rom with the MR Bios image. It's probably worth it if it works. I suspect that it is able to detect the ADI/2 controller and it will let you select PIO speeds, etc.