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Replacing a TMS2532 with a 2732


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#1 atrax27407 OFFLINE  

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Posted Tue Sep 5, 2017 7:50 AM

The standard TI 4K DSR chip, the TMS2532, is becoming difficult and expensive to find. With that in mind, I think I have come up with a scheme to replace a TMS2532 EPROM with a 2732 EPROM (cheaper and easier to find). I need some of you Electrical Engineer "gurus" to take a look at this and see if it is correct. Two stacked sockets are used with the bottom one plugging directly where the TMS2532 used to be seated.

 

Top Socket is the 2732

Bottom Socket is the TMS2532

 

Top Socket Pin 21 (A11) is connected to bottom Pin 18 (A11)

Top Socket Pin 20 (Vpp) is connected to bottom Pin 21 (Vpp)

Top Socket Pin 18 (-CE) is connected to bottom Pin 20 (-CE) 

 

All of the other pins are connected straight through.



#2 omf OFFLINE  

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Posted Tue Sep 5, 2017 8:07 AM

if the two EPROMs have the same space on them and the same pins but in a different order the only problem you have is the chip pinout.

 

rewire the pins as necessary.  the host hardware will not know or care the chips are different because it will be wired the same as the original chip so to speak



#3 arcadeshopper OFFLINE  

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Posted Tue Sep 5, 2017 10:07 AM

2532adapt.jpg



#4 arcadeshopper OFFLINE  

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Posted Tue Sep 5, 2017 10:16 AM

I am ordering some of these: 

 

Attached File  card.jpg   16.82KB   10 downloads



#5 brain OFFLINE  

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Posted Wed Sep 6, 2017 12:44 AM

Sorry for the delayed response, but I would recommend converting to 2764 pinout, as 2732s are also getting hard to find. 

 

The pinout for the TMS2532 is almost identical to the MOS 2364, with the exception of the A12 pin, so 2364 adapters should work:

 

Shameless Plug: http://store.go4retr...m/2364-adapter/

 

Jim



#6 atrax27407 OFFLINE  

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Posted Wed Sep 6, 2017 5:56 AM

I have not had any problems finding 2732 or 2732A EPROMs in quantity on eBay and elsewhere for reasonable prices. I have had private feedback from the "ultimate" TI hardware guy who stated that my adapter mod will work. That being said, it is time for a test!!



#7 schmitzi OFFLINE  

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Posted Sun Sep 10, 2017 3:16 AM

I am ordering some of these: 

 

attachicon.gifcard.jpg

 

 

:lust: oooh do you know where I can get some adapters like this ?

Since my adapter is broken I cannot read/burn i.e. the floppy-disk-controller eproms anymore.

 

(yes, I have tried to "build" my one one more than once, but since then all my sockets are a little bit - #§ahem%& - dearranged  :cool: )

 

Attached File  TMS2532-TMS2732-Adapter-IMG_9351-small.jpg   141.97KB   0 downloads



#8 atrax27407 OFFLINE  

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Posted Sun Sep 10, 2017 6:43 AM

The adapter is NOT to allow one to program a 2732 as a TMS2532 (there is an adapter for the MiniPro for that) but rather to allow the replacement of a TMS2532 with a 2732, The program space for both chips is the same. Also, I have found that you can eliminate the need for 3 solder joints if you use three sockets. Use machined sockets (like Schmitzi's picture) for the bottom two. Simultaneously stick wires in the pins you need to jumper and plug a second socket into the first. By using thin wire, it effectively "crimps" the wire into the socket semi-permanently, Place a third double wipe socket on top of the two with with the appropriate pins bent out. You now only have to make three solder joints. Alternatively, solder the jumper wires directly into the bottom socket pin holes (much easier than Schimtzi's picture) and then solder to the bent out pins of a double wipe top socket. I have some extremely thin jumper wires that work just fine.  



#9 arcadeshopper OFFLINE  

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Posted Tue Sep 19, 2017 9:48 AM

I purchased and built these adapters to program 2532's in a 2732 burner (minipro) they would also work the other way for burning a 2732 and using it in a 2532 socket.

 

Have to test next.. but here they are

 

Attached File  20170919_084401_HDR.jpg   1.18MB   1 downloads



#10 schmitzi OFFLINE  

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Posted Tue Sep 19, 2017 2:01 PM

:lust:



#11 arcadeshopper OFFLINE  

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Posted Wed Sep 20, 2017 4:37 PM

https://www.arcadesh...tegory=12497083



#12 schmitzi OFFLINE  

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Posted Wed Sep 20, 2017 10:54 PM

wow !! Ordered :) thanks a lot






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