I thought the 2121 used non-standard hard drive pinout or different connector? Or is it really IDE interface?

Cheers,

It's regular ide but the floppy drive is just like the one from the 2011

Some people on vcfed are working on an XTA SSD (both standard XTA = Tandy/Olivetti/Commodore/Segate A-X, and the incompatible IBM PS/1&2 types) 😀

But there's still quite a bit of work left to do, with current knowledge a working HDD is needed and it will be cloned exactly including dead sectors

Ryccardo wrote on 2023-07-29, 19:50:

Some people on vcfed are working on an XTA SSD (both standard XTA = Tandy/Olivetti/Commodore/Segate A-X, and the incompatible IBM PS/1&2 types) 😀

But there's still quite a bit of work left to do, with current knowledge a working HDD is needed and it will be cloned exactly including dead sectors

That's a very promising news! could you pleas e link the discussion?
I've followed the spanish user nestor that did some serious mod on the PS/1.

pentiumspeed wrote on 2023-07-29, 17:34:

I thought the 2121 used non-standard hard drive pinout or different connector? Or is it really IDE interface?

Cheers,

yes, I own a ps/1 2121 386 also and the mod is straightforword, just put a CF-IDE adapter and the bios will recognize a very convenient 512MB Hard drive.

Such a thing is always welcome.. ^^

But please keep in mind that AT-Bus, if possible, often is the better alternative;
has better performance (16-bit), more features (IDE auto-detect), has matured over the years etc.

Edit: That being said, I don't mean to discourage anybody working on XT-IDE/8-Bit IDE.
There are occasions were interesting PCs have on-board IDE (8-Bit) and one PC slot or ISA slot.
Here, it would be a waste not to try to make use of that on-board interface. ^^

fjk61011 wrote on 2014-04-12, 11:34:

I got the following from Vintage-computers:

I put a 512 MB Disk On Module IDE flash drive in my PS/1 Model 2121 (the 386SX version of the original weirdo proprietary form factor) and it worked perfectly fine -- I didn't even need to change any of the Setup options. The PS/1 automatically detected it and I was able to FDISK and FORMAT it without any problems.

The PS/1 Model 2011 (286 based), however, uses the same proprietary 8-bit "IDE-XT" interface as the PS/2 Models 25 and 30 (8086), which only works with a limited number of drives, usually 20 or 30 MB. It does not work with standard ATA / IDE-AT hard drives.

It MIGHT however, work with a CompactFlash module on an adapter! Those (fairly frequently) have the 8bit IO mode needed!

Here it is, @theruler :
https://forum.vcfed.org/index.php?threads/8-b … roject.1224016/
Don't buy anything based on what you see, the hardware is not final yet 😀

theruler wrote on 2023-07-30, 09:03:

pentiumspeed wrote on 2023-07-29, 17:34:

I thought the 2121 used non-standard hard drive pinout or different connector? Or is it really IDE interface?

Cheers,

yes, I own a ps/1 2121 386 also and the mod is straightforword, just put a CF-IDE adapter and the bios will recognize a very convenient 512MB Hard drive.

Please cite the information about creating IDE adapter so I could find and read on this?

Cheers,

pentiumspeed wrote on 2023-07-30, 13:40:

theruler wrote on 2023-07-30, 09:03:

pentiumspeed wrote on 2023-07-29, 17:34:

I thought the 2121 used non-standard hard drive pinout or different connector? Or is it really IDE interface?

Cheers,

yes, I own a ps/1 2121 386 also and the mod is straightforword, just put a CF-IDE adapter and the bios will recognize a very convenient 512MB Hard drive.

Please cite the information about creating IDE adapter so I could find and read on this?

Cheers,

Persdico Compact Flash CF To 3.5 Female 40 Pin IDE Bootable Adapter Converter Card Standard IDE Interface True-IDE Mode https://amzn.eu/d/bFufS9c

The ide interface on the 2121 is standard

Ryccardo wrote on 2023-07-30, 10:18:

Here it is, @theruler :
https://forum.vcfed.org/index.php?threads/8-b … roject.1224016/
Don't buy anything based on what you see, the hardware is not final yet 😀

Yeah! Thanks Ryccardo!

Unfortunately fjk61011 was banned ((( Does anyone know how to connect a 5.25 floppy unit to a PS/1 2121 motherboard? Motherboard fru 92F9657, as i think, it is same as other 386 SX 16 boards in 2121. I got the 5.25" floppy drive unit that goes under the basic unit, It has a disk drive inside, a cable that sealed to the interface board,(i think Buffer Card fru 1383637) and a typical IBM floppy cable comes out of interface board.
When connecting a floppy cable instead of 3.5 to 5.25 floppy, it is obvious that there is no power. However, unlike 3.5, the 5.25 floppy drive has standart power connector molex. But there was no separate power supply or powe cable to motherboard in the kit.

My IBM PS/1 Consultant
model #2155 is pretty good.
Supports up to 64mb RAM
4 RAM Slots
ISA motherboard
Intel Over drive up to 486dx4-100
Supports Standard IDE drives

I have an IBM 710mb IDE hard drive in mine works great.

For larger drives use “Ontrack” software.

Download link:
https://www.philscomputerlab.com/ontrack-disk-manager.html