Outrigger: an ongoing adventure with the OR840

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Re: "Outrigger" OR840 build

Postby doogie » 2019-1-26 @ 06:19

Thanks! I'm excited to be back on track with this build.

Capacitor Shopping List
Next-level OR840 badassery (namely, stable operation with up to 2GB RAM) can be achieved through a derivative of this parts list. My mission was to try to extend the life of this board as long as possible, and exceed the ESR/ripple rating for the components that were originally installed.

  • Nichicon RR50J821MDN1 6.3V 820uF, qty 12, replaces Sanyo OSCON 4SP820M
  • United Chemi-Con APSC100ELL391MHB5S 10V 390uF, qty 4, replaces Sanyo OSCON 10SP270M (see note)
  • United Chemi-Con APSG200ELL121MF05S 20V 120uF, qty 1, replaces electrolytic at grid H6
  • Nichicon RNS1D220MDS1 20V 22uF, qty 1, replaces electrolytic at grid J9
The surface-mount caps in the audio circuit were well within tolerance and not replaced. Same story for the array of tantalums.

Note: the 8mm diameter OSCONs seem to differ between board revisions - you'll see 470uF caps on other boards. 10V/390uF as an upgrade over the original 10V/270uF units seems to be fine on my early rev board.

Meanwhile...
Configuring SCSI devices..just like riding a bike, right? Seemingly I haven't forgotten how to get drives to play nicely with one another. I did always really like the Adaptec cards.

On channel A/50-pin:

  • dual Plextor PX-W124TSi
  • Plextor PX-40TSi

On channel B/68-pin Ultra160:

  • dual Seagate ST318451LW 18GB 15K screamers

..the Dream Machine called for a 75GB deathstar on the IDE bus, which I somehow have a still-working example. I do want to add a larger capacity drive - I'm thinking perhaps just piling onto the SCSI card with a monster 300GB disk.
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Re: "Outrigger" OR840 build

Postby chrismeyer6 » 2019-1-26 @ 07:11

A 300 gig SCSI drive sounds like a great idea to me. And I'd be Leary of using the death Star just in case it decides to die on you.
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Re: "Outrigger" OR840 build

Postby luckybob » 2019-1-28 @ 19:41

Sadly, SCSI has fallen out of favor with me. It is still cool as hell, but SATA is superior in EVERY measurable way. The only thing scsi has going for it, is the "cool factor" and possibility of some odd-devices. (eg scanner, tape)
It is a mistake to think you can solve any major problems just with potatoes.
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Re: "Outrigger" OR840 build

Postby slivercr » 2019-1-28 @ 22:59

luckybob wrote:...but SATA is superior in EVERY measurable way...

This. And even non-measurable ones like convenience.

I get the coolness factor of SCSI and the hit of nostalgia it provides, but I prefer a fast, reliable and silent solution like an SSD.
Outrigger: an ongoing adventure with the OR840
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Re: "Outrigger" OR840 build

Postby luckybob » 2019-1-28 @ 23:12

yep. There are only 2 reasons I will even consider SCSI.

1. I have no viable alternative. 68k macs and IBM ps/2 machines are notable examples.
2. I want to wave my dick around.
It is a mistake to think you can solve any major problems just with potatoes.
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Re: "Outrigger" OR840 build

Postby doogie » 2019-1-28 @ 23:56

I agree with both of you. This project fits solidly into your reason #2, luckybob. I'm recreating Maximum PC's Dream Machine, it called for SCSI, so there ya go, commence the waving.

For other builds, I've cared not at all for period correctness or whatever - give me every modern convenience I can get; I usually go with a ~120GB SATA SSD.
It was super difficult to track down the 18GB U160 drives, and the 68-pin -LW models (as opposed to the server backplane style LCA drives) were 2x-3x as expensive. Trust me when I say I have absolutely no reason to do SCSI ever again.

(let's not even talk about the cost of this stack of Plextor drives. but they are pretty badass.)
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Re: "Outrigger" OR840 build

Postby amadeus777999 » 2019-2-05 @ 15:49

luckybob wrote:yep. There are only 2 reasons I will even consider SCSI.

1. I have no viable alternative. 68k macs and IBM ps/2 machines are notable examples.
2. I want to wave my dick around.


The way it's meant to be waved(TM).

I never had SCSI back then and due to people ridding themselves of "trash" I got ahold of some controllers and a few disks... pretty awesome seeing/hearing it in action on an older system.
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Re: "Outrigger" OR840 build

Postby Arctic » 2019-4-14 @ 19:19

Is it possible to recreate your setup with the compaq ap550 varaint of the or840?
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Re: "Outrigger" OR840 build

Postby slivercr » 2019-4-14 @ 23:14

Arctic wrote:Is it possible to recreate your setup with the compaq ap550 varaint of the or840?

It should be possible. Either with the mods I used or with N-Yagi's mods.

If you have korean modded Tualatins from ebay, you might as well just try those in MSI slotkets, they may work right away (after you've modded the slotkets for dual CPUs, obviously).
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Re: "Outrigger" OR840 build

Postby Arctic » 2019-4-15 @ 08:32

I have Upgradeware Slot-T adapters, would they work too? Or would I have to mod them?

edit: Damn I just learned that the AP550 version has a modified/non-standard ATX connector. I need to find the pinout and make an adapter before I can even power it on, since I dont have an original Compaq PSU.
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Re: "Outrigger" OR840 build

Postby slivercr » 2019-4-15 @ 10:15

Arctic wrote:I have Upgradeware Slot-T adapters, would they work too? Or would I have to mod them?

edit: Damn I just learned that the AP550 version has a modified/non-standard ATX connector. I need to find the pinout and make an adapter before I can even power it on, since I dont have an original Compaq PSU.

I don't know if you would have to mod them, I've never had my hands on those adapters to try out or examine. If you're really serious about it and actually start work on it, i.e. get the motherboard running for starters, shoot me a PM and I might be able to help out.

EDIT: Sorry for the bluntness. A few people have contacted me with similar questions and even though I've put considerable effort into helping them, I've yet to see another attempt at Tualatins on i840. I won't get bamboozled into examining another set of slotkets before I know the project will actually go somewhere.
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Re: "Outrigger" OR840 build

Postby Arctic » 2019-4-16 @ 11:18

I am trying to figure out if it would be possible with the board that I have. If so, then I would have to buy a VRM and another Tualatin. To get the board running at all I need the original 375W Compaq PSU (or the pinout of the ATX so I can make an adapter).
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Re: Outrigger: an ongoing adventure with the OR840

Postby Callahan » 2019-4-24 @ 20:29

Arctic wrote:I am trying to figure out if it would be possible with the board that I have. If so, then I would have to buy a VRM and another Tualatin. To get the board running at all I need the original 375W Compaq PSU (or the pinout of the ATX so I can make an adapter).

WTX:
http://pinouts.ru/Power/wtxmain_pinout.shtml

Remember that original CPQ AP550 PSU has non-atx dimensions, it's larger.
https://www.ebay.com/itm/128399-001-Compaq-AP550-Switching-power-supply-110-240VAC-input-45-66Hz-7-D-/232196919714
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