I vaguely remember seeing a NCR specific option in the Win NT 3.1 installer, but I don't remember what model it was.

rasz_pl wrote:

This is pre APIC (1992 82489DX) so needs very custom OS support to work. It probably wont even run non vendor specific NT install.

Wow, I never even heard of a system like this before. Very cool. Can it run standard DOS/Win9x (single cpu only, of course)?

NT 4 should run on it, I have a copy of the HAL and the SCSI driver for it here. I actually threw in a hard drive from the other NCR with NT4 and it starts to load before crashing down with unaccessible boot device. Not surprised. It was mainly designed for AT&T Sys V Unix though.

Some benchmarks of the time rated this system faster than a p90 on just a single dx50 processor on many of the benchmarks, memory speed was very high

mmm dat AT101 keyboard

Wow - please keep this thread updated! Amazing machines.

yep. still jealous

This looks pretty interesting - never have come across such a thing in real life.

rmay635703 wrote:

Some benchmarks of the time rated this system faster than a p90 on just a single dx50 processor on many of the benchmarks, memory speed was very high

judging by how the start up screens shown on the previous page says "Interleave 0" and "Bank 0" and "Bank 1". If this system does "Interleaving" on the ram it may be a very early implementation of NUMA with dual memory banks, one for each CPU in the NCR System 3450. I don't know if it actually does this, but if it did, then that would be the reason for unusually high memory performance. I'm mostly speculating here but it could be how it works.

I don't think I ever updated on the 3450. I ended up buying one of the 6V lead acid batteries for the CMOS, but that's not helped much. Unfortunately I get stuck at CPU card EPROM checksum failed at every cold boot. Gotta clear the CMOS device table and CMOS settings and it'll work until I restart.

I have had DOS running on it as well as the beginnings of the NT installer. Unfortunately the NT4 installer just crashes out, probably due to being the multiprocessor version and not having the HAL loaded. There's a HAL for NT4 but I don't recall whether or not I tried it. Some Day(tm) I might go back to fighting with it more, I gave up when I couldn't get floppy working a few days ago.

I'll start a new thread soon(tm) on the 3434. I've been having somewhat better luck with that in terms of actually working, but driver support and OS support is iffy at best. If anyone knows where I can find a Clarity video card, that'd be absolutely amazing and solve half my problems.

You can use F5 in NT setup to pick HALs.

Hello all,

This is my first post, and since this topic has been inactive for so long I am not sure who will read it.
Our offices moved and we still had in storage our NCR3450 to dispose of. When put away (25-30 years ago) the only thing wrong with it was the power supply.
No one knew what to do with it, so it was destined to be recycled. Before sending it for scrap, I saw this forum and thought that some people might have an interest in the working motherboards? So yesterday, I opened it and took out everything I could find that was “easily removable” (nothing was easily removable!).
If anyone has an interest please let me know. I am not an electronics expert but all the capacitors seem to be in perfect condition and there’s a bit of dust…
Rozel
Panama

Rozel wrote on 2026-03-05, 09:03:

If anyone has an interest please let me know.

Thank you for your post, I have wished to test my SIV utility of a Dual i486 system for a very long time so am interested in the system, but given the size of the system all depends on where it is, where is it please?

Thanks for the quick reply. The boards that were removed from the unit are in Panama. I may have some of the old NCR manuals, but might take a while to locate those.

Rozel wrote on 2026-03-05, 09:28:

The boards that were removed from the unit are in Panama.

Thank you for the clarification, given the high postage cost to England and that the boards may not work I feel I should not get them. I hope someone closer would like them and they find a good home.

Rozel wrote on 2026-03-05, 09:03:

Before sending it for scrap, I saw this forum and thought that some people might have an interest in the working motherboards? So yesterday, I opened it and took out everything I could find that was “easily removable” (nothing was easily removable!).

Much respect for making the attempt to save these rare pieces of Computing History.

Rozel, this is a rare piece you have. it might help potential takers if you posted a photo of the front/back/inside of the system. Also very helpful would be physical dimensions and weight. People could use this to estimate shipping costs.

rare, but any collecting value was in whole package 🙁

red-ray wrote on 2026-03-05, 10:26:

Rozel wrote on 2026-03-05, 09:28:

The boards that were removed from the unit are in Panama.

Thank you for the clarification, given the high postage cost to England and that the boards may not work I feel I should not get them. I hope someone closer would like them and they find a good home.

Thanks for your interest. Everything was in working order except the power supply when this was retired from service.

BinaryDemon wrote on 2026-03-05, 10:39:

Rozel wrote on 2026-03-05, 09:03:

Before sending it for scrap, I saw this forum and thought that some people might have an interest in the working motherboards? So yesterday, I opened it and took out everything I could find that was “easily removable” (nothing was easily removable!).

Much respect for making the attempt to save these rare pieces of Computing History.

Thanks.