Made ROM SIMMs, wrote ROMdisk driver, need help debugging

[JDW]

Please let me know your thoughts on these AMP 822113-2 dual-sockets (30-pin). 

For the life of me, I cannot find the AMP drawings or schematics. The Length is probably right, but the Width is wider than the stock sockets, or at least it would seem when looking at the EBAY listing photos.  If you look at my SE/30 motherboard RAM sockets, you will see they are a perfect rectangle. But the EBAY sockets have little parts at either end which jet out a bit.  Even so, there is a gap between each dual socket on the motherboard.  I just cannot tell from the EBAY photo of the two parts that jet out would be longer than that gap. Can you?

Normal SE/30 motherboard SIMM sockets:

View attachment 37488

AMP 822113-2 dual 30-pin SIMM sockets:

View attachment 37489

 

[jammi]

Please let me know your thoughts on these AMP 822113-2 dual-sockets (30-pin). 

They're steeply angled and seem to have much wider spacing than the original dual SIMM sockets.

 

[Trash80toHP_Mini]

This is becoming widely far afield, I think we really need to spin this memory socket tangent off into a dedicated hacks topic @Cory5412

https://www.te.com/usa-en/product-822113-2.html

Customer drawing spec is .5" (1/2") spacing vs. what looks like .375" (3/8") spacing for the upright paired sockets on my SE/30 board.

https://www.te.com/commerce/DocumentDelivery/DDEController?Action=showdoc&DocId=Customer+Drawing822113JtifEnglishC_822113_J.tif822113-2

Single SIMM sockets are the way to go it seems.

 

[JDW]

The last we heard from @ZaneKaminski in this thread was August 9th.  It's Oct. 13th today.  I can understand being very busy for a few weeks, but it's been more than 2 months.  I can't help but worry about what might have happened.  Zane, if you are listening, despite your busy schedule, please check in by posting a single sentence saying, "Guys, I'm still alive!"  Thanks!

 

[davidg5678]

I guess I'll contribute to this tangent, too.

It looks like PE connectors also sell dual 30 pin sockets. The product they offer looks similar to the eBay product that @JDW was discussing previously. Thankfully, PE Connectors provides technical drawings of the sockets, so one could determine if they will fit or not.

https://www.peconnectors.com/sockets-pga-cpu-and-memory/hws9229/

 

[tt]

Anyone know if the ROM SIMMs still available for sale?

 

[JDW]

Anyone know if the ROM SIMMs still available for sale?

Yes: https://www.bigmessowires.com/mac-rom-inator-ii/

As for Zane's ROM, well, he's dropped off the planet for the last 3 months so I honestly don't know what the situation is.

 

[Torbar]

As for Zane's ROM, well, he's dropped off the planet for the last 3 months so I honestly don't know what the situation is.

I searched his username and found his Github, and it looks like he made a contribution to a repo Oct 18th, so he's still alive at least!

 

[JDW]

I searched his username and found his Github, and it looks like he made a contribution to a repo Oct 18th, so he's still alive at least!

Glad to hear he’s alive, to be sure. But it still doesn’t explain his three month hiatus from this forum, especially because he sent me a ROM for testing quite sometime ago and I’ve been hoping to hear his feedback on that. His ROM is an alternative to the ROM-inator II.

 

[tt]

Yes: https://www.bigmessowires.com/mac-rom-inator-ii/

It's not 8mb and I want to try Zane's ROM.

 

[JDW]

@ZaneKaminski

We've not heard from you in a long while, and I've not received any replies to the PMs I sent to you way back in August 2020.  I see on your profile page your last visit here was Jan. 13th 2021 though.  That indicates you are still visiting this forum, and as such I'd certainly love to hear your thoughts regarding my report about your 8MB ROM SIMM, used in an SE/30.  I put more details in the PMs to you, but my public report is in the following post:





Thanks, Zane.  I hope all is well!