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1 Meg Super AMS Discussion Thread

TI-99/4A 1MEG SAMS AMS

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#201 RXB OFFLINE  

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Posted Mon Dec 26, 2016 12:25 PM

I can see a number of use cases for that, Rich. I also have a random question: which byte is written first? I ask this because the first byte written will be the one that is latched, and would be in the value range of >00 to >0F. I just wanted to make sure I have the byte data in the right order in my earlier post. . .

In my GPL Code I move just one byte into the Even Address to change a page:

ST   >0A,@>4014

 

Same thing you can do from XB:

CALL LOAD(16404,10) ! Or move >0A at mapper >4014)

 

Assembly has to move a word but GPL and XB do not need to do that.

Your change adds another value to make it a word as it has always been just a byte for me on SAMS.



#202 Sinphaltimus OFFLINE  

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Posted Sun Jan 15, 2017 11:09 AM

So what does a layman have to do to get a working preassemled card?

#203 Shift838 OFFLINE  

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Posted Sun Jan 15, 2017 12:32 PM

So what does a layman have to do to get a working preassemled card?

 

Send a PM to Ksarul here on AA.



#204 Ksarul ONLINE  

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Posted Sun Jan 15, 2017 8:21 PM

I have to order some more boards though, as I sold the last one from the first batch just before Christmas. . .I already planned to do that this weekend though, so I will have new boards in-hand in a few weeks.



#205 --- Ω --- OFFLINE  

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Posted Sun Jan 15, 2017 8:55 PM

So what does a layman have to do to get a working preassemled card?

 

This card is simply beautiful too.

 

gallery_35324_1027_2550399.jpg

 

Here is a photo of the "Grand Prize" drawing from last years TI Fest West, the card was donated by Jim (Ksarul).  



#206 ElectricLab OFFLINE  

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Posted Sun Jan 15, 2017 8:59 PM

 
This card is simply beautiful too.
 
gallery_35324_1027_2550399.jpg
 
Here is a photo of the "Grand Prize" drawing from last years TI Fest West, the card was donated by Jim (Ksarul).  


I agree, it's a work of art in more ways than one.
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#207 Iwantgames:) OFFLINE  

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Posted Sun Jan 15, 2017 11:17 PM

Awesome piece of tech, and Rasmus' new Dungeons of Asgard really makes it a must have item!

#208 --- Ω --- OFFLINE  

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Posted Sun Jan 15, 2017 11:20 PM

Awesome piece of tech, and Rasmus' new Dungeons of Asgard really makes it a must have item!

 

Hmmm, I've not been following that one...



#209 rootboy OFFLINE  

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Posted Wed Feb 1, 2017 6:52 PM

Anyone have the part numbers of the 512 Meg SRAM chips? Thanks!



#210 helocast OFFLINE  

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Posted Wed Feb 1, 2017 7:33 PM

Anyone have the part numbers of the 512 Meg SRAM chips? Thanks!

Manuf.# 628512LP-70 are the ones I ordered. https://www.jameco.c...PRmxrVULThlD5Fh



#211 rootboy OFFLINE  

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Posted Wed Feb 1, 2017 10:02 PM

Manuf.# 628512LP-70 are the ones I ordered. https://www.jameco.c...PRmxrVULThlD5Fh

Thanks!



#212 helocast OFFLINE  

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Posted Thu Feb 2, 2017 10:57 PM

One down; one to go. It's nice to work on a clean, new PCB as I really needed a break from consoles for a while =]

Attached Files



#213 klrw111-78 OFFLINE  

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Posted Wed Sep 13, 2017 2:34 PM

Just got my bare board last week and I ordered my parts for the SAMS based on the list under the board on ArcadeShopper.  While assembling the board, I notice that the 74LS04 and the 74LS688 have been replaced by 74LS34 and 74LS683.  Can someone explain the difference, please? 


Edited by klrw111-78, Wed Sep 13, 2017 2:47 PM.

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#214 klrw111-78 OFFLINE  

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Posted Wed Sep 13, 2017 2:56 PM

Just got my bare board last week and I ordered my parts for the SAMS based on the list under the board on ArcadeShopper.  While assembling the board, I notice that the 74LS04 and the 74LS688 have been replaced by 74LS34 and 74LS683.  Can someone explain the difference, please? 

 

 

Sorry--- Just read the full thread and found the answer...



#215 klrw111-78 OFFLINE  

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Posted Thu Dec 21, 2017 3:11 PM

I was testing ICs for use on this card with a MiniPro TL-866.  I understand that the Minipro will not test three of the chips used on this card, but it should test the static ram chips.  My Minipro begins the process of checking the rams, but ends up giving a USB communications error 32 before finishing.  I have tried chips by Hitachi and Alliance and have the same issue with both.  I have installed the latest software and drivers.  Has anyone else experienced this issue?



#216 RickyDean OFFLINE  

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Posted Thu Dec 21, 2017 3:38 PM

I was testing ICs for use on this card with a MiniPro TL-866.  I understand that the Minipro will not test three of the chips used on this card, but it should test the static ram chips.  My Minipro begins the process of checking the rams, but ends up giving a USB communications error 32 before finishing.  I have tried chips by Hitachi and Alliance and have the same issue with both.  I have installed the latest software and drivers.  Has anyone else experienced this issue?

I can try to test a few and see if I get the error, I believe I have tested some bad  and good ones in the past (6 to 8 months ago) and they tested correctly.



#217 Ksarul ONLINE  

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Posted Fri Dec 22, 2017 10:36 AM

I haven't had any problems in testing RAM for the 40 or so SAMS boards I built, but all of my RAM came directly from Mouser, so it wasn't an aftermarket purchase. For that matter, I never even had to run a chip test on one of them, as they all worked on initial installation (unlike some of the LS chips--I found about a dozen bad chips while building those boards, mostly LS612s).


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#218 RickyDean OFFLINE  

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Posted Fri Dec 22, 2017 11:16 AM

I can try to test a few and see if I get the error, I believe I have tested some bad  and good ones in the past (6 to 8 months ago) and they tested correctly.

I tested ram on mine last night Hitachi  and moser 62256, no errors. Even the bad ones still tested bad :-D



#219 klrw111-78 OFFLINE  

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Posted Fri Dec 22, 2017 7:55 PM

Thanks guys.  I bought one set of SRAMS from Mouser and one from Jameco and get the same result for all four.  All 74 logic chips testable with the minpro checked ok.  I purchased all the chips except the LS612s from Mouser.  The 612s came from Quest Components (not off ebay).  



#220 klrw111-78 OFFLINE  

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Posted Fri Feb 2, 2018 10:19 AM

Getting back to troubleshooting my SAMS card.  I bought a mini-pro and tested all my chips expect for 3, and all tested OK.  When the card is installed and powered on everything seems to be working OK.  When I attempt to load something that uses 32k memory, the led on both the memory card and the disk controller light up and system has to be rebooted.  I end up with a trashed disk image.  Since I discovered I damaged at least 2 traces during my desoldering efforts (didn't socket everything at first), I want to confirm the schematic version to use for additional troubleshooting.  Is this the correct one for the current revision (note that the 555 is not shown)?Attached File  A3-SAMS-P1(R4).pdf   143.12KB   6 downloads 



#221 Ksarul ONLINE  

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Posted Fri Feb 2, 2018 10:54 AM

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).



#222 RXB OFFLINE  

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Posted Fri Feb 2, 2018 11:05 AM

Does anyone have the SAMS 1 Meg code for switching pages or post the Manual with Assembly or GPL code?



#223 RickyDean OFFLINE  

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Posted Fri Feb 2, 2018 11:15 AM

Does anyone have the SAMS 1 Meg code for switching pages or post the Manual with Assembly or GPL code?

Rich, are you talking about the original AMS or new stuff?



#224 RXB OFFLINE  

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Posted Fri Feb 2, 2018 12:19 PM

Rich, are you talking about the original AMS or new stuff?

New for the 4 Meg SAMS I have code for the 1 Meg SAMS in RXB already.



#225 RickyDean OFFLINE  

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Posted Fri Feb 2, 2018 12:59 PM

New for the 4 Meg SAMS I have code for the 1 Meg SAMS in RXB already.

Ok, when I was looking for GKUtilities last night I found some of my old stuff, so no, I don't have it then. Sorry


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