Jump to content
JDW

SE/30 PDS Adapter Epic Blunder

Recommended Posts

18 hours ago, JDW said:

Meaning, they could be a bad batch as a result?

 

 

Yes, that was my thought, but again, I think the pins look too clean for that to be the case.

 

Another possibility is that these are ones that failed the post manufacturing test (did they have automated test and scan testing with JTAG back then?) and were binned as failures, and again, somehow found their way into a sales channel.

 

A happier possibility is that these were manufacturing rejects, because their pins somehow got bent.  So they are perfectly good chips, but couldn't be used in a pick and place manufacturing situation because of the bent pins.

 

Or they could just be left overs that never got used which suffered some pin damage over the years; e.g. someone spilled the tray onto a hard floor.

 

Leftovers do find their way back into the sales channel.   AMD made the 79C950 (CURIO) for Apple, which is the chip used from the Q840AV through the PPC PowerMacs (x500 family) to provide internal/external SCSI, Serial, and ethernet.   It was a custom job for Apple.    Yet trays of those unused chips showed up on Ebay about ten years ago or so.   I suspect that those leftovers were from one of the clone makers rather than Apple itself.  Apple seems to do a "good" job of keeping its leftover chips off the aftermarket.

Share this post


Link to post
Share on other sites
4 hours ago, trag said:

A happier possibility is...

The resurrection of my poor 040 card replies heavily on that happier possibility.

 

Fingers crossed regarding your negotiating skills, @joethezombie!

Share this post


Link to post
Share on other sites

Good news!  I have nearly 3 full trays of DayStar goodness on my dining room table!

 

IMG_0274.thumb.JPG.477b1cf47b01317a539f5d478bb5e1c1.JPG

 

I'm not sure if I should prepare them with nacho cheese or salsa!  Maybe a delicious queso?

Or perhaps a fill of the tub and a quick swim is more in order?

 

Many thanks to the kind friends from CHIPNet.com!

Share this post


Link to post
Share on other sites

It took some haggling, but I got a decent deal.  Legs look to be solder-free, even under magnification.  But nearly every one has some kind of bent portion.  If I were at the races, I'd bet on the trays being dropped.

Share this post


Link to post
Share on other sites
17 hours ago, joethezombie said:

It took some haggling, but I got a decent deal.  Legs look to be solder-free, even under magnification.  But nearly every one has some kind of bent portion.  If I were at the races, I'd bet on the trays being dropped.

That is fantastic news!   How many chjps in a tray?

 

Guacamole.

 

So how long until you guys are producing new ones?    I have 800 IS61C632 (32K X 32 SRAM) that could be used for cache, if that helps...

Share this post


Link to post
Share on other sites
6 hours ago, trag said:

So how long until you guys are producing new ones?    I have 800 IS61C632 (32K X 32 SRAM)

That will take some more time I guess.

There are still three GALs on the ASIC Turbo that need examination too before such a thing could happen.

32K*32 would be a waste if we want to stick to the original 128K of cache. Mouser still stocks 32K*8 so the SRAM would not be a real issue... The Tag-SRAM however would be.

I have got a roll of AT7174 but not sure where to go when that’s empty.

Working on 030 accelerators right now that will need those.

 

At first we‘re going to see if the chips are legit and working at all and get @JDW‘s Turbo fixed if they are.

Share this post


Link to post
Share on other sites
12 hours ago, Bolle said:

32K*32 would be a waste if we want to stick to the original 128K of cache. Mouser still stocks 32K*8 so the SRAM would not be a real issue... The Tag-SRAM however would be.

32K X 32 is 128K of cache....  It's all on one chip, instead of spread over four.   However, buying 32K X 8 chips that match the JEDEC standard of the original chips avoids any re-engineering.

 

Tag-SRAM is an SRAM with comparators on board.  It shouldn't be too difficult to create a replacement if you run out of existing parts.  The challenge is making the new arrangement fast enough. 

Share this post


Link to post
Share on other sites
3 hours ago, trag said:

2K X 32 is 128K of cache....

heh, you’re right. Shouldn’t answer any threads before the first morning coffee.

Making a fast enough replacement for the comparators isn’t too hard if you have enough I/O on whatever CPLD you are using.

Share this post


Link to post
Share on other sites

Sorry for my late reply, but I'm not getting email updates from this forum for some reason, and no, it's not my SPAM filter either.  I simply came here today to see if @joethezombie had any success, and WOW!  You are THE MAN, Joe!  Did you have to dig those out of their trash bin? :lol: Regardless, the fact they are in your hands is simply outstanding!

 

What's the next step in getting some chips to @Bolle?  Assuming my poor accelerator board is only afflicted in that one area, it would be a good test to see if those chips are in working order.

Share this post


Link to post
Share on other sites

A good portion of the chips will be sent to @Bolle, and I'll maintain a healthy supply for the Americas for users in need of repairs, or perhaps future products.  I should be able to get the package shipped out tomorrow.  Here's to hoping they're the real deal!

Share this post


Link to post
Share on other sites
7 hours ago, joethezombie said:

A good portion of the chips will be sent to @Bolle, and I'll maintain a healthy supply for the Americas for users in need of repairs, or perhaps future products.  I should be able to get the package shipped out tomorrow.  Here's to hoping they're the real deal!

That's great, Joe.  I look forward to hearing the findings of @Bolle after he receives his batch.

Share this post


Link to post
Share on other sites

Not sure of the feasibility, but it may be worth taking a few of those more badly damaged ones, and sending them to a Chinese reverse engineering house to see if the chips can be reverse engineered and the logic put into an FPGA or something. 

Share this post


Link to post
Share on other sites
On 2/6/2020 at 5:15 AM, techknight said:

Not sure of the feasibility, but it may be worth taking a few of those more badly damaged ones, and sending them to a Chinese reverse engineering house to see if the chips can be reverse engineered and the logic put into an FPGA or something. 

That's a fantastic idea!

 

This could, in time, allow for clones of the Turbo040 to be developed, yes?

 

c

Share this post


Link to post
Share on other sites

@Bolle I just wanted to follow-up to confirm if you've received your batch of chips yet from @joethezombie?

 

It's not a problem if you've been busy.  Just curious what you found.

Share this post


Link to post
Share on other sites

They're on the way (again)

There was an issue with packaging and they got returned to joe. He said he was going to send them again.

Share this post


Link to post
Share on other sites

Yeah, they were returned due to the packaging being not large enough for a specific label on one dimension.  I found it rather peculiar.  But then again, I just received a package from Italy, and the sender had to scans of their photo ID, customs forms, and all manner of other paperwork.  The paperwork was thicker than the parts!

 

Anyway, I know it's not what you want to hear, but I haven't yet got them back out.  I'll double my efforts to get them out tomorrow!

Share this post


Link to post
Share on other sites
10 hours ago, joethezombie said:

Yeah, they were returned due to the packaging being not large enough for a specific label on one dimension.

I've shipped a lot of int'l packages during my 25 years in Japan, so you have me very curious as to what label it was they complained about.

 

BTW, I never get any email notifications of replies to this thread, despite the "Notify me of replies" switch below my reply being green and check-marked.  Am I the only one who has to manually visit this thread every day to see if somebody replied?

Share this post


Link to post
Share on other sites
39 minutes ago, JDW said:

BTW, I never get any email notifications of replies to this thread, despite the "Notify me of replies" switch below my reply being green and check-marked.  Am I the only one who has to manually visit this thread every day to see if somebody replied?

No. This is a known issue with the forum software (something about the email server's spam filter not being tuned properly or something).  The admins are aware of the problem and are slowly working on a fix.

 

c

Share this post


Link to post
Share on other sites
16 hours ago, CC_333 said:

The admins are aware of the problem and are slowly working on a fix.

xx(

That keyword "slowly" indicates "no fix in sight."  

Is there a forum thread on the topic where we can contribute to accelerating the pace of that much needed fix?

Share this post


Link to post
Share on other sites
On 2/18/2020 at 4:23 PM, JDW said:

That keyword "slowly" indicates "no fix in sight."  

Probably *sigh*

 

On 2/18/2020 at 4:23 PM, JDW said:

Is there a forum thread on the topic where we can contribute to accelerating the pace of that much needed fix?

I don't know. I guess you could try PMing the admins?

 

c

Share this post


Link to post
Share on other sites

Hey James,

 

Yes the chips are on their merry way to Germany.  Apologies I didn't get them out as soon as what you would have wanted-- I had an unexpected turn of events which caused a significant delay.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

×