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TMS2564


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#1 atrax27407 OFFLINE  

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Posted Fri Oct 6, 2017 3:20 PM

Texas Instruments made two versions of their TMS2564 (which is an 8K EPROM). The more common version is a 28-pin package that is still difficult to find. The most difficult version is the 24-pin package. It was used in the TI DSDD FDC. It appears that all of the 4K EPROMs (i..e., TMS2532, 2732, etc.) have address lines numbered A0->A11. The 8K chips (2764) have address lines A0 ->A12. I am looking for the datasheet for the TMS2564 24-PIN package.  I have been unable to find it on ;line. Can anyone help me out? I know it muxt exist somewhere in cyberspace!



#2 helocast OFFLINE  

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Posted Fri Oct 6, 2017 4:34 PM

Sorry - mask rom vs. eprom

Worst case. Here's some other resources:

https://console5.com...x_8-Bit_(24-pin)

and if you have to go the adapter route:

http://ist.uwaterloo...rs/sockets.html

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Edited by helocast, Fri Oct 6, 2017 5:04 PM.


#3 helocast OFFLINE  

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Posted Fri Oct 6, 2017 4:43 PM

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#4 atrax27407 OFFLINE  

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Posted Fri Oct 6, 2017 5:09 PM

I have that one. The TMS4764 is a PROM not an EPROM. I need that data sheet for the 24-pin TMS2564. It looks like the AM27C49 might work but I need to see how it compares with the TMS2564.



#5 digdugnate OFFLINE  

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Posted Fri Oct 6, 2017 5:47 PM

is this it @atrax?

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#6 helocast OFFLINE  

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Posted Fri Oct 6, 2017 6:02 PM

I have that one. The TMS4764 is a PROM not an EPROM. I need that data sheet for the 24-pin TMS2564. It looks like the AM27C49 might work but I need to see how it compares with the TMS2564.

No, I understand. I caught it was a rom and not eprom, but there doesn't seem to be a way to delete replies (only edit).

 

You're welcome to my entire 1984 catalog attached, but I'm only seeing 28-pin versions in Chapter 6.

Sorry.

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#7 atrax27407 OFFLINE  

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Posted Sat Oct 7, 2017 12:14 PM

I have it on the highest authority (Jim Fetzner) that the AM27C49 will work in place of the 24-pin TMS2564 package. And I quote:

 

 

 

"It should work--but you'll have to shift pins 18, 19, and 21 to get the address lines in the proper order. . ."



#8 RickyDean OFFLINE  

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Posted Mon Oct 9, 2017 5:45 AM

This may have some useful info about a variety of eproms:

 

https://www.mikesarc...page=ROMref.txt



#9 atrax27407 OFFLINE  

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Posted Mon Oct 9, 2017 6:37 AM

Many thanks!!! Buried amongst the details, were the pinouts for the elusive 24-pin package of the TI TMS2564. If my programming adapter works for the AMD27C49s. I can make a socket adapter for it to fit in a 24-pin TMS2564 socket. 



#10 atrax27407 OFFLINE  

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Posted Mon Oct 9, 2017 9:02 AM

I was mistaken. The last four pins were continued on the next page. Alas! It is the 28-pin package. I'll have to keep looking.



#11 RickyDean OFFLINE  

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Posted Mon Oct 9, 2017 9:24 AM

I was mistaken. The last four pins were continued on the next page. Alas! It is the 28-pin package. I'll have to keep looking.

Maybe here?

 

https://console5.com..._8-Bit_(24-pin)



#12 Ksarul OFFLINE  

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Posted Mon Oct 9, 2017 10:29 AM

Here's a nice diagram showing how to cross the pins on a 27HC641 to use as a 2364 (or in our case, a 24-pin TMS2564).



#13 atrax27407 OFFLINE  

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Posted Mon Oct 9, 2017 1:53 PM

There appear to be very few of the 27HC641s available - even on eBay. The going price seems to be about $10-15 per chip. 



#14 atrax27407 OFFLINE  

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Posted Mon Oct 9, 2017 2:21 PM

It also appears that the AM27C49 and the 27HC641 (by MICROchip) are "pin identical". The MiniPRO does NOT support either one directly without an adapter. I'm working on an adapyet for the cheaper (and more readily available) AM27C49. I believe that I have the pinouts figured out.



#15 CPUWIZ OFFLINE  

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Posted Mon Oct 9, 2017 3:43 PM

Look for 68764C, it is a 24 pin 8K EPROM.  They are rare, but I have them.



#16 CPUWIZ OFFLINE  

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Posted Mon Oct 9, 2017 5:33 PM

MMDM7-7.GIF



#17 atrax27407 OFFLINE  

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Posted Mon Oct 9, 2017 9:16 PM

I had a bunch of Motorola MCM2532Cs. I found that they were impossible to program with most modern USB-powered programmers. It seems that the problem is that they aren't very tolerant of undervoltage programming. They require an absolute 25V to work. The TMS2532, on the other hand is very tolerant of undervoltage programming and program consistently at 21V.






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