How do I identify the manufacture of an Eprom?

[shortrackskater]

I'm trying to use my new EasyPRO 80B. I need to read a chip but to read a chip you need to know who makes it. There's rows of numbers and a big "i" on it. I assume that's an Intel but none of the rows of numbers match up with any chips listed. This is a game chip for a Bally Game maker that I'm trying to read, for educational purposes!

[Shaggy]

Dude can't you get into something easier like "like stamp collecting" ?   

[UNIMAN]

Does the software that comes with the program have an icon labeled "ID".?

My GQ2 has that and I select ID and the software tells me what it is.

Logically you should not need to know who manufactured it for reading purposes. For writing to the eprom you should know as there are different voltages used to write depending on manufacture.

[mustangjeep]

Here's a link to a site showing this as an Intel 68x6048

http://cpushack.com/chippics/EPROM/27512/Intel68X6048-PI-A-A.html

Kinda strange, I tried looking that number up in my eprom reader and I can't find a listing for it.
It's never let me down in it's list, it's pretty complete but maybe this is an oddball???

[rokgpsman]

I think it is the equivalent of a 27512 eprom.  If you peel the label back some more do you find out that there is not a window for erasing? If no window then it isn't an eprom, would be a prom. But it probably does have a window. I think it is the same as a 27512 eprom but with custom part number markings by Intel for some reason. (Intel and AMD used to make chips for private label to IBM and they would mark them using the IBM specified part number).

If your eprom burner works with 27512 then you can set it for that and should be able to read it.

As to the topic name of your post, the manufacturer is Intel.
Below are a few of the popular chip manufacturer's logos.

[UNIMAN]

Yes, that is an oddball. Try looking for datasheet for it!! I did and couldn't find it.
Did find as posted it is 27512 compatible.

[shortrackskater]

Thanks everyone!

I just tried selecting INTEL 27512 and get "device ID don't match."
I also tried 275c12 and got the same thing...

My software doesn't have anything that says ID, that I can see.
It does have the window for erasing.

[rokgpsman]

Does your setup let you select manufacturer "IBM" ?

[shortrackskater]

Does your setup let you select manufacturer "IBM" ?

No IBM there... BUT I did just uncheck "Check ID's Valid" and it seemed to do something! I'm totally a newbie at this. I think it read the blackjack chip because I was able to save a hex file that was about 128kb... heck is that too small? I think I wrote that on the blank chip. I'm just going to stick it in and see if it works!

UPDATE:
FAIL!

[rokgpsman]

The 27512 chip is actually a 64kb x 8 bit wide memory. The "512" part of the part number refers to the total number of bits that are stored. Since most system organize the data into 8 bits then the number of stored data bytes is 64k.

Not sure why your programmed chip didn't work. When you read the 68X6048 chip you had your programmer set to 27512, right?  Do you think the 27512 chip has the right speed rating?

[shortrackskater]

There was two selections D27C512 and D27S512
I think I picked the first one... I can try the second and see.
I'm still not understanding the steps of this "Easy" pro80B...it's not very easy to use, so far.
Oh... sorry... the file size was 184kb. I'm getting tired.

I also can't find any "erase" feature on this. Supposedly the 4 chips I bought were erased but I'm not sure. I'll try a different chip.

[mustangjeep]

On my programmer if I deselect the " check ID" then the checksum numbers won't match on burnt chips.
I'm fairly new to this also but with the chip you tested for working look at the chechsum numbers and make sure they match the originals.
There should be a spot in your program for looking at that.

[rokgpsman]

There was two selections D27C512 and D27S512
I think I picked the first one... I can try the second and see.
I'm still not understanding the steps of this "Easy" pro80B...it's not very easy to use, so far.
Oh... sorry... the file size was 184kb. I'm getting tired.

I also can't find any "erase" feature on this. Supposedly the 4 chips I bought were erased but I'm not sure. I'll try a different chip.

Since we believe that the 68X6048 is equivalent to a 27512 then the storage capacity of the chip is 64k. So when you read it with the programmer and save the file it should be 64k in size. When you save the file does your programmer software let you set the buffer size or some other parameter?

Your eproms you bought probably are erased because if they weren't your programmer should have given you an error. Unless it has "blank device check" disabled in the settings.

On an eprom with a window you can't erase them with the programmer, takes UV light shining thru the window for 20-30 minutes. The chips that are eeprom are the type that can be electrically erased. You would need to get a little UV eprom eraser to erase the eproms with windows.

[shortrackskater]

On my programmer if I deselect the " check ID" then the checksum numbers won't match on burnt chips.
I'm fairly new to this also but with the chip you tested for working look at the chechsum numbers and make sure they match the originals.
There should be a spot in your program for looking at that.

I'm kind of lost here... If I uncheck that ID box, it acts like it's reading the good chip. If I keep it selected, I get an error.

[shortrackskater]

There was two selections D27C512 and D27S512
I think I picked the first one... I can try the second and see.
I'm still not understanding the steps of this "Easy" pro80B...it's not very easy to use, so far.
Oh... sorry... the file size was 184kb. I'm getting tired.

I also can't find any "erase" feature on this. Supposedly the 4 chips I bought were erased but I'm not sure. I'll try a different chip.

Since we believe that the 68X6048 is equivalent to a 27512 then the storage capacity of the chip is 64k. So when you read it with the programmer and save the file it should be 64k in size.

Your eproms you bought probably are erased because if they weren't your programmer should have given you an error.

On an eprom with a window you can't erase them with the programmer, takes UV light shining thru the window for 20-30 minutes. The chips that are eeprom are the type that can be electrically erased. You would need to get a little UV eprom eraser to erase the eproms with windows.

They were supposed to be erased but the seller goofed up the order amount... I was supposed to get 9 and they only "could find 4" so they say.
I ordered that exact eraser a couple days ago from, where else, a Chinese ebay seller. I'm expecting to see it in a couple days! 
Actually I've been getting stuff from China in usually under 10 days.

[rokgpsman]

On my programmer if I deselect the " check ID" then the checksum numbers won't match on burnt chips.
I'm fairly new to this also but with the chip you tested for working look at the chechsum numbers and make sure they match the originals.
There should be a spot in your program for looking at that.

I'm kind of lost here... If I uncheck that ID box, it acts like it's reading the good chip. If I keep it selected, I get an error.

I haven't used your particular programmer but the way they usually work is this:  To avoid possibly damaging a chip the programmer reads the ID of the chip and checks to see if that info matches what you have selected as the chip manufacturer and part number before it does anything else. If it doesn't match it gives an error.

The programmer allows you to bypass that ID check if you want to, sometimes there are good reasons for doing so. When reading the chip it isn't very dangerous to the chip, it only applies power and ground to the chip then reads each memory location in the chip and stores that data in memory in your computer (or in the programmer on big commercial models). But when programming the chip the programmer has to apply the burn voltage to a certain pin and those voltages vary from chip to chip and with different manufacturers. That's why the programmer is careful about the ID.

Some programmers will read the chip ID and tell you what it is. If yours doesn't do that then you won't be able to read that 68X6048 chip unless you uncheck the box for verify ID, unless you somehow make it happy with the mfr and device number selection (Intel 27512 or other compatible setting). Do you have other device numbers in the programmer software that are similar to 27512, like 27512A ?

[shortrackskater]

There was two selections in reading the Intel chip - D27C512 and D27S512.
I have a feeling these just weren't erased. The seller stated "refurbished" but now I'm wondering. There's not much refurbishing to do on a pulled IC so I assumed it meant erasing.
What's that saying about "assume?" 
I'm hoping those new chips will arrive soon so I can try this.
I put the Blackjack game chip back in and it works fine... 

Can I just put those other chips out in the sunlight all day tomorrow? Would that erase them?
 

[rokgpsman]

There was two selections in reading the Intel chip - D27C512 and D27S512.
I have a feeling these just weren't erased. The seller stated "refurbished" but now I'm wondering. There's not much refurbishing to do on a pulled IC so I assumed it meant erasing.
What's that saying about "assume?" 
I'm hoping those new chips will arrive soon so I can try this.
I put the Blackjack game chip back in and it works fine... 

Can I just put those other chips out in the sunlight all day tomorrow? Would that erase them?
 

I don't think they would erase in sunlight until many weeks had passed. The UV is just too weak. We used to put them on the window sill at work for weeks just to see and finally gave up, even after 2 months the chips still had the data and the checksums verified ok. One of our engineers joked and said if those eproms erase that way then don't go outside because you'll vaporize.

I saw that on your programmer software on the top menu there is a choice called "Device". If you click on it there is a dropdown menu and the bottom choice says "Auto select eprom". Does that properly id your 68X6048 chip? You can try it with one of the 27512 eproms to see how that function works.

I was reading about your Easypro 80B software and it saves the eprom data to a file in a format with extra information, that is why the file size is more than 64kb.

[shortrackskater]

I put the other one back in my GM but I stuck in the "new" pulled Fairchild chip which is an FM27C512QE120 as this:

[rokgpsman]

Catalyst Semiconductor was (is??) an ic company out in California in the 1980's. Maybe they and Fairchild are related but I don't know why it would say 27128 instead of 27512.