VOGONS


Reply 140 of 156, by Sphere478

User metadata
Rank l33t++
Rank
l33t++

Okay so I need to make better markings on the silk. To keep people from doing this 🤣

Sphere's PCB projects.
-
Sphere’s socket 5/7 cpu collection.
-
SUCCESSFUL K6-2+ to K6-3+ Full Cache Enable Mod
-
Tyan S1564S to S1564D single to dual processor conversion (also s1563 and s1562)

Reply 142 of 156, by ajacocks

User metadata
Rank Member
Rank
Member

Ohhhhh!

That explains it. That didn’t occur to me, -at all-. I generally assemble with my multimeter, and the negative voltages led me astray!

Here is my solution to the P8/P9 AT connector problem:

IMG_0207.jpeg
Filename
IMG_0207.jpeg
File size
1.69 MiB
Views
1309 views
File license
CC-BY-4.0

I used the AT connectors from one of the cheap-o no-negative rail ATX to AT adapters. If you use ferrules on the end, they insert and stay nicely in the connectors on the PCB, once crimped.

- Alex

Last edited by ajacocks on 2022-11-07, 02:21. Edited 1 time in total.

Reply 143 of 156, by ajacocks

User metadata
Rank Member
Rank
Member

So, all 5 units work fine, of course, after fixing the polarity. What is everyone doing who is using these boards in ATX cases? I'm building a Socket 5 Pentium into a modern glass ATX case, and of course the power switch is momentary, and not easy to replace.

I'm looking through all the past discussions on this, and the best thing I have found is to just hard-jumper the PSU on, and use the PSU-mounted power switch to turn the system on and off.

- Alex

Reply 144 of 156, by Sphere478

User metadata
Rank l33t++
Rank
l33t++

Well, I suppose that is the next evolution of this, to make a latching circuit.

Not much room left for it 🤔

Perhaps a inline thing that can be shrink tubed?

When is someone gonna build the latest version? Haha :p

Sphere's PCB projects.
-
Sphere’s socket 5/7 cpu collection.
-
SUCCESSFUL K6-2+ to K6-3+ Full Cache Enable Mod
-
Tyan S1564S to S1564D single to dual processor conversion (also s1563 and s1562)

Reply 147 of 156, by Sphere478

User metadata
Rank l33t++
Rank
l33t++
wiretap wrote on 2022-11-07, 03:54:

I have a latching circuit design on my github.

Link me broski! 🧐

Sphere's PCB projects.
-
Sphere’s socket 5/7 cpu collection.
-
SUCCESSFUL K6-2+ to K6-3+ Full Cache Enable Mod
-
Tyan S1564S to S1564D single to dual processor conversion (also s1563 and s1562)

Reply 148 of 156, by Doornkaat

User metadata
Rank l33t
Rank
l33t
ajacocks wrote on 2022-11-07, 02:16:

So, all 5 units work fine, of course, after fixing the polarity. What is everyone doing who is using these boards in ATX cases? I'm building a Socket 5 Pentium into a modern glass ATX case, and of course the power switch is momentary, and not easy to replace.

I'm looking through all the past discussions on this, and the best thing I have found is to just hard-jumper the PSU on, and use the PSU-mounted power switch to turn the system on and off.

- Alex

Usually you can replace the momentary power switch on your case with a regular (latching) switch with the same dinensions.

Reply 149 of 156, by wiretap

User metadata
Rank Oldbie
Rank
Oldbie

Have no fear... softpower version. That little Maxim IC fits perfect.

https://github.com/wiretap-retro/PICO-AT-Powe … apter-softpower

pic.png
Filename
pic.png
File size
32.37 KiB
Views
1237 views
File license
CC-BY-4.0

My Github
Circuit Board Repair Manuals

Reply 150 of 156, by Sphere478

User metadata
Rank l33t++
Rank
l33t++
mr_bean_cheating_exam.jpg
Filename
mr_bean_cheating_exam.jpg
File size
71.26 KiB
Views
1157 views
File license
Public domain

😁

Filename
PICO-AT-high-current Soft 0.9.zip
File size
1.96 MiB
Downloads
52 downloads
File license
Public domain

Edit: added screw clearance on 3.3v plane (not shown in pics)

Attachments

  • front-3d.png
    Filename
    front-3d.png
    File size
    173.61 KiB
    Views
    1094 views
    File license
    Public domain
  • back-3d.png
    Filename
    back-3d.png
    File size
    140.47 KiB
    Views
    1094 views
    File license
    Public domain
  • schematic.png
    Filename
    schematic.png
    File size
    323.05 KiB
    Views
    1094 views
    File license
    Public domain
Last edited by Sphere478 on 2022-12-26, 05:27. Edited 4 times in total.

Sphere's PCB projects.
-
Sphere’s socket 5/7 cpu collection.
-
SUCCESSFUL K6-2+ to K6-3+ Full Cache Enable Mod
-
Tyan S1564S to S1564D single to dual processor conversion (also s1563 and s1562)

Reply 151 of 156, by Sphere478

User metadata
Rank l33t++
Rank
l33t++

layers

Attachments

  • 12v.png
    Filename
    12v.png
    File size
    224.47 KiB
    Views
    1093 views
    File license
    Public domain
  • 5v and 3.3v.png
    Filename
    5v and 3.3v.png
    File size
    172.94 KiB
    Views
    1093 views
    File license
    Public domain
  • gnd2.png
    Filename
    gnd2.png
    File size
    160.25 KiB
    Views
    1093 views
    File license
    Public domain
  • gnd.png
    Filename
    gnd.png
    File size
    151.75 KiB
    Views
    1093 views
    File license
    Public domain
Last edited by Sphere478 on 2022-12-26, 03:18. Edited 1 time in total.

Sphere's PCB projects.
-
Sphere’s socket 5/7 cpu collection.
-
SUCCESSFUL K6-2+ to K6-3+ Full Cache Enable Mod
-
Tyan S1564S to S1564D single to dual processor conversion (also s1563 and s1562)

Reply 152 of 156, by Sphere478

User metadata
Rank l33t++
Rank
l33t++

This version has clear markings indicating ground as positive for those capacitors btw. so hopefully no more esploded tantrums. 🤣

Also, as you can see I added the device that wiretap discovered also 😀 thanks Wiretap!

BTW:
I have a request about the previous versions that I have uploaded. Please don’t order them anymore. They are nice to have around incase I need to check something or copy/paste something but don’t order them anymore. This goes for the latest one if it has been superseded also, (check future posts) if you already built one that is fine though. 😀

Please use the latest version if you use one of the ones I made.

If you use wiretap’s versions. Ask him what to do. 😀

In general you should use the latest version. Not sure why people in this thread are ordering and building older versions.

I have made the latest fully backwards compatible. You need not populate all its features. It is able to function in any configuration.

Sphere's PCB projects.
-
Sphere’s socket 5/7 cpu collection.
-
SUCCESSFUL K6-2+ to K6-3+ Full Cache Enable Mod
-
Tyan S1564S to S1564D single to dual processor conversion (also s1563 and s1562)

Reply 153 of 156, by Berzerkula

User metadata
Rank Newbie
Rank
Newbie
wiretap wrote on 2022-03-07, 19:15:

Did some research.. It appears Molex only produced the flat style AT pin header for use with the 90331 connectors. Those flat pin 8619 style connectors were only used on AT motherboards to a certain time period, then Molex discontinued the 8619 and replaced it with the KK 396 square pin connector as seen on the motherboard above, which is compatible with the 90331 connector, as well as KK 396 female connectors obviously. So, the only way to do a board mount connector is to use the one I am using in this design. If the motherboard uses the old 8619 connector, it would need to be replaced with the KK 396 type. So, with the KK396 compatible with both the 90331 and KK396 itself, you lose no functionality with the original connector.

Greetings Wiretap,

The great feature I like about Molex's website is you can choose a connector and it will have a "Mates With/Use With" tab to click. I have some of the latest revision of normal and hi-current at the fab. Rather than change the part on the motherboard, figured I'd build a couple of these with connections for blade or square.

KK series https://www.molex.com/molex/products/family/kk
Mates With/Use WIth feature https://www.molex.com/molex/products/part-det … cles/0009481064

-William

You feel a whole lot more like you do now than you did when you used to.

Reply 154 of 156, by goodtofufriday

User metadata
Rank Member
Rank
Member
wiretap wrote on 2022-11-08, 20:18:

Have no fear... softpower version. That little Maxim IC fits perfect.

https://github.com/wiretap-retro/PICO-AT-Powe … apter-softpower

pic.png

Is there a BOM with all the mfr or mouser #'s?

NVM made one from the other BOM. Includes a replacement for the molex connector as the original has a 33 week lead time as of 3/29/23.

additonal edit: Out of all my boards none had the square varient of the AT connector, even my newer boards. Picking up the male end of the connecoter as well from mouser.
https://www.mouser.com/ProductDetail/Molex/09 … njDhMjOYncWU%3D

Attachments

  • Filename
    BOM.xls
    File size
    31.5 KiB
    Downloads
    37 downloads
    File license
    Public domain

A fixer of things. I also broke those things.

Reply 155 of 156, by ChrisXF

User metadata
Rank Newbie
Rank
Newbie

On the question of latching logic for power on, I took an old fashioned approach with mine: I replaced the momentary switch on the case with a latching one of the exact same dimensions (50cents from AliExpress) and fed those wires to PWR_GD.

https://a.aliexpress.com/_mN1I0qQ

Works perfect, the switch latches down like an AT case should, and cost way less than the 74 series logic to build a latch circuit.