Jump to content

BGE's take on the Quadra 900/950 ATX PSU Mod


Recommended Posts

On 9/15/2020 at 1:04 AM, BadGoldEagle said:

Also, I have been trying to calculate the LB power consumption... I'll probably create a new thread about this but here's where I'm at:

 

I'll see if I can dig up testing I did as part of my project later. I did some tests as part of current draw/voltage drop across my board by making a harness to go between the motherboard and PSU with breaks in the voltage lines. Hooked up my bench PSU as the power source to get a fairly accurate idea of current draw on 5V and 12V, as well as a measurement of input voltage vs output voltage (aka, does my board need thicker copper and/or thicker traces/more plane area?). I mostly just shat pictures into a group chat instead of actually documenting anything, which makes it difficult. Go me? I should be able to find stuff on the IIcx, IIci, IIsi, Quadra 650 and LC 3. Having charts of the various Apple machines and real world power draw would be nice. 

Edited by Compgeke
Link to post
Share on other sites
  • 2 weeks later...
  • Replies 112
  • Created
  • Last Reply

Top Posters In This Topic

Sorry for the lack of updates, I've had stuff to do at work and my 950's system folder got corrupted. I only now realized that I had a spare HD with 7.6 on hand... So I was able to re-bless my 8.1 Folder using 7.6. 

I'm currently imaging that hard drive. It has some pretty rare programs and extensions.

 

This also gives me the opportunity to test the QuadrATX. So far, everything works, the system is stable. I'd like to test some Nubus/PDS cards but for that I need a working FDD (I have a second Floppy EMU on the way as my original one is in a different country).

 

Also, in my last post, I had noticed that the fan controller was acting up sometimes. If you didn't give it enough time in the ACC position (key to I), the fan would only start 30% of the time. After a simulated power outage (and the key in the lock position), it wouldn't start up at all. Well today I tried another bootloader, and my Attiny85 quit working altogether. So I used one of the ATtiny25s I ordered for you guys and flashed it with my code. Now the fan works correctly 100% of the time. I got the Attiny85 on eBay (I bought the 25s on Arrow), so that may be why it died...

 

 

Link to post
Share on other sites

On the menu today: Endurance tests with PDS/Nubus cards.

I don't have that many (1x Supermac PDQ, 1x Ethernet and 1x Houdini II DOS Compatibility PDS card, currently testing the latter).

 

Apparently PC Setup 1.0.3 works fine under 8.1... It shouldn't but it clearly does. I've never been able to load the control panel let alone start the PC using 1.5.4/2.1.7.

 1214182123_dosKopie.thumb.jpg.498230a14dd08f8efe661914382961b4.jpg

It's slow as hell (according to my calculations, preparing that 2GB drive file should take about 76 minutes...) but it's working!

 

Edit: It took one hour and 28 minutes. My estimation wasn't that bad after all.

 

Edited by BadGoldEagle
Link to post
Share on other sites
  • 3 weeks later...

Hi, I´m from argentina, i´m trying to use my Quadra 900 but I want to know if you can help me or not.

I have my Quadra 900 with Spectrum 8 SIII video card, but i cant make it work. My monitor is a Supermac 20"

If I plug or not the video card, my computer doesnt work. It turns on, chime sound sounds ok but no image.

I tried resetting PRAM (Zap RAM) and nothing happened.

I Tried with a tv with video mode, the on board video out or the videocard............is the same

I can see the hard drive blinking for a while, and then if you press Ctrl + Alt + Supr you can hear a sound from the speaker. It is obviously the system is working.

For a while "it worked" but like the monitor out of frequency, showing lines and differents "grey scale" colours. No chime at start up but that was because i was holding the buttom that is close the reset. 

I dissasembled everything. Nothing looks burned or any blowed capacitor. Even inside the PSU

Can anyone hlp me? thanks and sorry bout my english

 

Link to post
Share on other sites

Hi @OVa

 

Your PSU is fine. The Spectrum/8 has a "round robin" type of synchronisation sequence (it cycles through all possible modes when it forgets its config). 

1/ Turn on the Quadra and hold the Option key on your keyboard until you start to see things (even gibberish) on the display.

2/ Have a finger on the spacebar ready

3/ As soon as something "good" appears on the display (in other words as soon as the monitor syncs to it, greyscale and overblown blacks with bad centering is ok), hit the spacebar. 

It should stay in that mode and stop rolling. When you zapped the PRAM, it deleted the original setting. Keep in mind that this will reset if you place the card in another slot. 

Check the manual (especially page 23) for more info.

 

That card also needs some drivers (SuperVideo 3.1 should work even with cards with an old ROM):

https://vintageapple.org/macdrivers/video/knighttech/index.html

 

If you still can't get it to work (and if your monitor has a DB-15 connector), then I'd give internal video a try (it's the upmost port on the Quadra). It usually works better. 

Once booted you can probably configure the card using SuperVideo (the driver linked above). 

 

If nothing of the above works, then I'd create a new thread about this issue...

 

 

 

QuadrATX news report:

The SWIM on the 950's logicboard is fine (my floppy drive isn't though) but at least I can start working on the AC part. 

I have selected a drill (a Bosch UniversalImpact 800 for those interested, along with some HSS-G bits) and will be smoke testing the AC board next weekend. 

Link to post
Share on other sites

thanks for answer, 

I´ve been holding option key for almost 20 seconds and nothing happened. Do i have to wait for more? It could be better if i try to hold option key without the video card? how much time?

I tried even without the video card. Only ram, PSU and ADB (keyboard) I cleaned every ram module, and the video ram too.

is the same. You can hear the chime but nothing happend. 

Link to post
Share on other sites
  • 2 weeks later...
On 11/6/2020 at 10:39 AM, BadGoldEagle said:

QuadrATX news report:

The SWIM on the 950's logicboard is fine (my floppy drive isn't though) but at least I can start working on the AC part. 

I have selected a drill (a Bosch UniversalImpact 800 for those interested, along with some HSS-G bits) and will be smoke testing the AC board next weekend. 

 

How did the smoke test go?

My Bicker-630 arrived today! Talk about heavy duty PSU. I can’t wait to get started.

 

d8y2Zhf.jpg

Link to post
Share on other sites

Great to hear and what a setup! 

 

I've had to modify the AC board and I'm letting it dry at the moment. I forgot to remove the middle plated hole for the monitor plug and this voids my clearance goal (a short could have happened with board degradation/age). So I removed it the hard way (ie with my iron set way too high and by poking around the pad). 

Once the header is installed, you can't see anything so another run isn't really needed. 

 

I did update the files and I'm confident enough to put them "out there".

-> https://github.com/L-Delorme/QuadrATX

 

I'm not an expert when it comes to licensing. So I went with CC-BY-NC-SA-4.0

 

In other news, the standoffs I've found are a bit on the expensive side but should be more than enough to prop up the PSU:

M2143-3005-ss

Link to post
Share on other sites
5 hours ago, BadGoldEagle said:

Great to hear and what a setup! 

Thanks!

5 hours ago, BadGoldEagle said:

In other news, the standoffs I've found are a bit on the expensive side but should be more than enough to prop up the PSU:

Have you started the drilling as of yet? Which wall of the old unit will carry the ATX? Maybe it’s obvious once I start gutting the Bicker? The standoffs look proper, will they be part of the finished kit? Sorry about all the questions, I’m getting ahead of my self. ;-) 

 

Each day my old PSU is getting one step closer to death.

Link to post
Share on other sites
On 11/16/2020 at 9:39 PM, ktkm said:

Have you started the drilling as of yet?

The drill bits arrived today and the standoffs are still in the post. I'll do the drilling and the installation this week-end. 

 

On 11/16/2020 at 9:39 PM, ktkm said:

The standoffs look proper, will they be part of the finished kit?

I will only be shipping boards with a few hard to find (or specific) components (live wire connector, µ-controller...). The rest will have to be bought separately (e.g. on Arrow) using the BOM I'm still concocting. 

 

On 11/16/2020 at 9:39 PM, ktkm said:

Which wall of the old unit will carry the ATX? Maybe it’s obvious once I start gutting the Bicker?

It will be mounted vertically, on the wall closest to the logicboard.

Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...

×
×
  • Create New...