New Eprom Programmer

[jdkmunch]

I just got my GQ-4X programmer and have a few questions.   

First:   If you remember I have two chips from eBay that I believe to be mislabeled.   One was supposed to be a SET15 chip and the other was an SS6173.   How can I verify what's on these chips?  I have a good SET15 - can I backup that good working chip to a bin file, then create a backup from the other chip then compare the files? 

[SAT (aka GANDHI)]

Back in the old site I posted a file that I think would answer many of your current questions...

I uploaded it in the Submit Files section and it's called "Willem_Eprom_Programmer-_How_to_Rev-1-01.pdf"

Hope it helps

[Foster]

Select the 27C512
Insert good chip
Read the known good set 015 chip into the software.
remove good chip
insert the questionable chip
pick Verify (Green V icon) the software will compare the good buffer with the data in the chip it will list each error by address.
(the software by default does this each time you program a chip)

[jdkmunch]

That my man is brilliant -  I will do that in a bit.

[Foster]

If you read the SS chip with the software (if you do not know the chip type remove label and double check it)
 near the end of the 8K block you will see S+..#### (#### is the SS chip number)

[jdkmunch]

Here's what's wierd...  I read both chips:

LABELED SS6173 Has the proper hex code in the 8K range - but it doesn't work in the machine.   I guess it's just a bad burn.


I attached the latest read.

[Foster]

what theme is the chip

[jdkmunch]

It was a Black Cherry 3 coin machine - 


I did what you suggested and put in the suspected bad set15 chip then put in the good set15 chip and verified and this is what I got:
Verifying...Code Memory
Device is verified
Elapsed time: 4.16 seconds.

[Foster]

Then it should work, as long as it didn't error on you.
or read each one and if the checksum is different then you know they dont match as well.

[jdkmunch]

It's nuts though  - why would i put that chip in I get a 61-1 ??????????


There is still something strange......

[Foster]

which chip?

[jay]

61-1 is the error you get after a game change.

Check out Ricks Faqs and follow the instructions from a game change.....

[jdkmunch]

What I have to do is put this SET15 chip in and see if it works.  

What should I be looking for when I place it in the unit?  I haven't had a need to use one yet.  

I know when I put the SS6173 in - It doesn't work   -    No 61-1, no moving reels, nothing just nothing.

[jdkmunch]

61-1 is the error you get after a game change.

Check out Ricks Faqs and follow the instructions from a game change.....

I've read it - and I've done it with working chips without a problem  - -

[jay]

I have emailed you some set instructions.

[jdkmunch]

Thanks! I'm trying to figure out if the chips I ordered were eeproms or eproms -  I thought they were erasable because they were used from epromman.com

It would stink if they weren't

[jay]

If the chip has a little glass window its eraseable via UVlight. A Eprom (no window) is typically a write once chip. Cheap.
EEProms are Elecrical Eraseable.More expensive but handy for people like myself that screwup often.

[jdkmunch]

Stupid question -  How could I buy these used?  If they are used aren't they useless ??????

[jay]

Yes buying a non-eraseable eprom would be goofy. I doubt that anyone would have the brass to sell them.....unless they were NOS - New Old Stock that have never been written too.

That is funny.... For sale large quanity of used Eproms..... Cheap....  almost as bad as purchasing low mileage condoms.....

[jdkmunch]

I should have mine tomorrow!   

[jdkmunch]

Sooooooo Is there an easy way to erase an eprom?  Can't I just write all 0's in it.

[jdkmunch]

I guess I'll be shelling out some cash for an eraser.   

http://cgi.ebay.com/EPROM-ERASER-Ultraviolet-UV-Lamp-Light-w-Timer-NEW_W0QQitemZ110297053158QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item110297053158&_trksid=p3286.c0.m14&_trkparms=72%3A1205%7C66%3A2%7C65%3A12%7C39%3A1%7C240%3A1318%7C301%3A1%7C293%3A1%7C294%3A50

[stayouttadabunker]

  Don't feel so bad Munch, I had to buy one too

I was running outta chips real fast...lol

As far as "Can't I just write all 0's in it."...I'm not sure if that would work...I think it's worth a try to waste a chip.

If it doesnt work, when the eraser comes in, erase it!...voila!... you've saved the eprom for another shot!

[jdkmunch]

Yaa I think I can get one for $21 including shipping from ebay.

[jay]

If you buy the Electrical Eraseable Eproms - about 4x the cost of one that is eraseable via Ultraviolet that is exactly what you can do.
You simply erase the chip which takes it back to 0's.

OPBell made a supurb post about how a Mosfet works - with them being the building block of an Eprom.
From his description. You would likely be able to reburn and change a 0 into a 1 but not the otherway around.

So if you understand that all numbers represented in binary you could decifer what your alternate values could be...

HEX to binary is a rather quick conversion. If you think about Hex being 2 characters each between the value of 0 - F  (0 - 15 in decimal) you can
use this for each nibble (4bits) of the binary value.

Binary is the representation of a 1 or a 0 representing a number
0000     =  0          1000 = 8
0001     =  1          1001 = 9
0010     =  2          1010 = 10 (A in Hex)
0011     =  3          1011 = 11 (B in Hex)
0100     =  4          1100 = 12 (C in Hex)
0101     =  5          1101 = 13 (D in Hex)
0110     =  6          1110 = 14 (E in Hex)
0111      = 7          1111 = 15 (F in Hex)

Ie 10 HEX would be  0001 0000  (16 in Decimial)
    12 Hex would be  0001 0010  (18 in Decimal)
    0F Hex would be  0000 1111  (15 in Decimal)

Buildig on StayoutofBunker's (Bunky's ?) early post about having burnt in the wrong spot on the Eprom, you could likely sucessfully re-burn into other spots of the 27C512 that have not already been written too.

This is also why Canadians tell tell their wives they are going for "A" beer or perhaps Eh beer.