Copying information from 27C64 to 27C512

[Malembe]

Hi there, everyone!

I encountered a small problem those days when i want to upgrade the game that i have already on a poker machine (Bally 5000 plus, Joker Wild), from 1989 version to 1997 version of it. On slot U88 i found that the eprom is a 27C512 type, when normally should be a 27C64. I have the programmer, i have the eraser, i have the original GPK.U88 for this new game...but how can i copy this to an 27C512. If i put the original 27C64, the game is working if i am trying to put the 27C512, with the content of an 27C64, dark screen. How did it work before and how i can make a functionally copy of 27C64 into 27C512, to work properly. I have only one 27C64 and a bunch of 27C512!

[knagl]

I'm very green when it comes to burning EPROMs, but have you tried copying the data 8 times into a 512k file (8*64=512) so that it's just repeated eight times throughout the chip, then try it in the machine?

Perhaps someone else can better explain what I'm trying to say to do...

[Malembe]

No, i didn't try and honestly, i don't know how to do that, also i am beginner, all i know is that i'm trying to do that, is telling me that the eproms is not empty " blanck check..error"

[rickhunter]

With an S+ the easy solution was to burn the 27c512 with an offset of c000.   I don't know if this will work no a bally though.  The other way is to copy the data 8 times into a new file and then burn that.  This is how you do it using a winodws command prompt.  Let's call your original file small.bin, copy it to the root of C so it is easy to find then open a command prompt and type the following

copy small.bin+small.bin+small.bin+small.bin+small.bin+small.bin+small.bin+small.bin big.bin

The resulting file, big.bin will have the data duplicated 8 times and you burn that to a 27c512 and it should work.

[uniman]

For Universal game owners;
I've done the same thing when backing up Universal game files. They are originally on a 2732 EPROM, a 24 pin chip that sits in a 28 pin socket.
Using a GQ reader/burner from MCUmall I read the eprom as 2732 and save a copy.
Then switch to 27c512 on my reader and open the saved file.
Now copy down 16 times (in my case, eight times for a 2764) and burn the chip. Actually I copy down four times and then recopy the four, four more times. 

Much easier to find 27c512's than 2732's.