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1 Meg Super AMS Discussion Thread

TI-99/4A 1MEG SAMS AMS

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#226 klrw111-78 OFFLINE  

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Posted Sat Feb 3, 2018 3:24 PM

Yes, that is the closest match to your version of the board. I need to add the 555 circuit to that one (it is mostly independent of the rest of the board, so it should not be what's giving you issues here. One additional thing I would check here is the LS612. I get way too many weird symptoms from bad 612 chips (About one in six of the NOS chips I've picked up for these was bad).


Can you suggest a source? I bought 4 on EBay and eight from an electronics store in CO and still don't have one that works 100%.


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#227 Ksarul OFFLINE  

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Posted Sat Feb 3, 2018 4:21 PM

I bought everything the last source I used had--and used them to build the 40 or so boards that I built in the last run. Two suggestions though: Unicorn Electronics in Alaquippa PA or Syracuse Semiconductors. I usually get good parts from both of them.



#228 klrw111-78 OFFLINE  

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Posted Sat Feb 3, 2018 7:31 PM

I bought everything the last source I used had--and used them to build the 40 or so boards that I built in the last run. Two suggestions though: Unicorn Electronics in Alaquippa PA or Syracuse Semiconductors. I usually get good parts from both of them.

 

 

Thanks



#229 Sinphaltimus OFFLINE  

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Posted Sun Feb 4, 2018 8:34 AM

I still want one of these so much - is there such a thing as "layaway" anymore?



#230 arcadeshopper OFFLINE  

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Posted Sun Feb 4, 2018 10:18 AM

I still want one of these so much - is there such a thing as "layaway" anymore?

They are 80$ assembled or the bare boards are 20$ grin so cheap anybody can save up

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#231 Ksarul OFFLINE  

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Posted Sun Feb 4, 2018 11:19 AM

And in another month or so, I will have the next batch on-hand to begin another round of assembly. . .



#232 atrax27407 OFFLINE  

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Posted Sun Feb 4, 2018 12:44 PM

1 Meg or 4 Meg?


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#233 klrw111-78 OFFLINE  

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Posted Sun Feb 4, 2018 6:20 PM

And in another month or so, I will have the next batch on-hand to begin another round of assembly. . .

 

 

I finally got mine working, but still would like to keep my name on the list for one in the next batch (got some spaghetti on the present one) .   



#234 Ksarul OFFLINE  

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Posted Sun Mar 25, 2018 6:15 PM

I had some fun hobby time this weekend, building a bunch of SAMS boards with some assistance from Iliketurtles. :) He's getting quite good at stuffing components for me--and he likes doing it, which is even better. Now we just need to populate them with chips and run them through the testing process. Several of these are already earmarked for folks who have expressed interest for one via private message, but once we're done filling those orders, there should be a few left for others wanting one. I have plenty of bare boards (sold through Arcadeshopper's website), so I'll be able to keep building these for a while before needing to make another order.

Attached Files



#235 Pheonix OFFLINE  

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Posted Sun Mar 25, 2018 7:22 PM

I'd love to get one :)

 

Just out of curiosity, do (or did,) they make blank clam shells for TI expansion cards?


Edited by Pheonix, Sun Mar 25, 2018 7:28 PM.

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#236 --- Ω --- OFFLINE  

--- Ω ---

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Posted Sun Mar 25, 2018 7:42 PM

I'd love to get one icon_smile.gif

 

Just out of curiosity, do (or did,) they make blank clam shells for TI expansion cards?

 

Not to my knowledge.  Personally, I think it's a wide open market for someone with a 3D printer.



#237 Ksarul OFFLINE  

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Posted Sun Mar 25, 2018 7:48 PM

Pretty much the only way to get a TI clamshell is to remove one from an existing card. Several notes here, however. Most cards that were designed without a plan to use a clamshell don't have holes placed in the board to allow them to use one. In addition, the TI clamshells have a couple of protrusions that would contact a board without additional holes that are needed to avoid the protrusions--and they would either prevent the clamshell from closing (by impacting with a component) or short out some traces (very bad for the card and the PEB).

 

One note, I had to pay somewhat more to get some of the chips for this lot, so the price for anyone that didn't have a prior reservation at the old price is $85 to a US address (with appropriate adjustments for shipment to other countries).



#238 retroclouds OFFLINE  

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Posted Sun Mar 25, 2018 10:03 PM

Hi Jim, I would be very interested in buying one. Id like to setup my 2nd PEB and SAMS would fit real nice :-)

#239 Pheonix OFFLINE  

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Posted Sun Mar 25, 2018 10:21 PM

These don't look like they have mounting holes.  But the 3D-Printer idea seems good.  Would have to be a generic mounting system, or one that can be adjusted.  Mainly thinking of component protections more than anything else.  Would also feel more comfortable with better ventilation.  That's one thing that's bothered me about the original TI cards.  No ventilation :(



#240 Ksarul OFFLINE  

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Posted Sun Mar 25, 2018 10:29 PM

Yours is reserved, Filip!



#241 Flottmann1 OFFLINE  

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Posted Mon Mar 26, 2018 2:37 AM

Hi Jim, I also would be very interested in buying one SAMS Card, if it is possible :)


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#242 RXB OFFLINE  

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Posted Mon Mar 26, 2018 5:29 AM

If they are the new 4Meg versions I need to buy one and get it working with RXB.



#243 Schmitzi OFFLINE  

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Posted Mon Mar 26, 2018 8:41 AM

yes please, if 4 MEG :)



#244 RickyDean OFFLINE  

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Posted Mon Mar 26, 2018 9:04 AM

Me too!! 



#245 Ksarul OFFLINE  

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Posted Mon Mar 26, 2018 9:24 AM

These are 1Meg cards, @RXB and @Schmitzi. I still have to track down some issues with the test boards I did to make a 4M upgraded board. That probably won't come to pass this year.

 

I have added both of you to my list, @Flottmann1 and @RickyDean.



#246 Opry99er OFFLINE  

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Posted Mon Mar 26, 2018 10:12 AM

Im in the middle of a large multi-staged TI purchase, otherwise Id be all over this...

#247 Ksarul OFFLINE  

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Posted Sat May 5, 2018 3:17 AM

I have several assembled and tested 1Meg SAMS cards on hand after catching up on back orders. Price is $$85 to a US address or $100 to the rest of the world, shipping is included.



#248 Ksarul OFFLINE  

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Posted Sat May 12, 2018 12:04 PM

There are still three assembled cards available from this batch. No worries on future availability either, as I have sufficient parts on hand to build another 20-30 boards (although I do need to buy some additional memory chips, as I am running low on those). I need to send Arcadeshopper some bare boards to restock his site as well.



#249 RickyDean OFFLINE  

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Posted Thu May 31, 2018 8:48 AM

Nice job so far! On the memory chip sockets, you really didn't need to add the extra four pins to go from 32 to 36 pins (unless you want to put a 36-pin 2MB NVSRAM chip in one (and leave the other one empty). I did that on one of my test boards to see what would happen. You only get to use 1MB of the space though, as the logic to feed the rest of the address data to the mapper inputs is missing from this iteration of the board. If you do choose to use the single large chip, you do need to set the jumpers to 2048K. I'll have to look to see what my last assembled and tested serial number is to let you know what yours should be to maintain the sequence.

Jim, I have searched in my messages and in this thread, but cannot find where you might have given me a number for my SAMS, which I built, Do you remember if you did? The last I could find was you had told Greg his was #15. Sorry for any inconvenience.



#250 Ksarul OFFLINE  

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Posted Thu May 31, 2018 4:49 PM

I don't think we ever assigned one, as it was still having issues. I think I did keep number 27 open for it though, so I would suggest using that.  :)







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