Jump to content
IGNORED

Replacing a TMS2532 with a 2732


atrax27407

Recommended Posts

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.

  • Like 1
Link to comment
Share on other sites

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

Link to comment
Share on other sites

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: )

 

post-41141-0-57183300-1505034720_thumb.jpg

Link to comment
Share on other sites

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.

  • Like 1
  • Thanks 1
Link to comment
Share on other sites

  • 2 weeks later...
  • 6 years later...

I have an AIM-65.

I ordered 2 adapters.

When I received the adapters I tried them on the AIM-65.

The adapter layout places the 2 EPROMs are too far apart to fit 2 adapters side by side in the AIM's rom sockets.

Bummer,

Can these adapter be redesigned moving the two EPROMS closer together.

Note; It looks as if the adapter layout has 2 locations between the EPROMS please confirm.

If true can the owner of the PCB design make a couple changes

   1) use round pads on the footprint and

   2) move the EPROMS closer together.

 

 

  • Like 1
  • Confused 1
Link to comment
Share on other sites

20 hours ago, Starliner said:

I have an AIM-65.

I ordered 2 adapters.

When I received the adapters I tried them on the AIM-65.

The adapter layout places the 2 EPROMs are too far apart to fit 2 adapters side by side in the AIM's rom sockets.

Bummer,

Can these adapter be redesigned moving the two EPROMS closer together.

Note; It looks as if the adapter layout has 2 locations between the EPROMS please confirm.

If true can the owner of the PCB design make a couple changes

   1) use round pads on the footprint and

   2) move the EPROMS closer together.

 

 

If, with one of the adapters, you first plug a turned pin socket into the motherboard then plug the adaptor into that, so that one adaptor sits higher than the other, does that give you enough room?

 

Just a thought.

 

 

  • Like 2
Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
  • Recently Browsing   0 members

    • No registered users viewing this page.
×
×
  • Create New...