New Eprom Programmer

[uniman]

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.

Jay,
Isn't it the other way around? 
An erased eprom is all 1's. You can burn it to 0. Never can you burn an eprom 0 to a 1.
Only the ultraviolet light can add the 1's back into the eprom.
I've never used electrical erasable eproms, but I would suspect they too would be all 1's when erased.

[StatFreak]

I was just looking at the other thread to confirm before posting, and Uniman beat me to it by a minute. (from the time I started typing, not the post time )
An erased EPROM is all 1's (FF in every location).

So an EPROM full of 0's would be completely written and could not be changed until erased.

The writing of 0's is at the bit level, so of you look at Jay's chart, you could change a written value to something else, as long as the change only involved writing 0's to replace 1's.

For example: You could change the value of D7 (1101 0111) to 13 (0001 0011).

Of course, this is just classroom talk. On a practical level this would be silly, since you would almost certainly not be able to change every contiguous value to the one needed for your program to work.

I'm with Uniman in suspecting that the EEPROM would work the same way, but I'll leave that to Op-Bell to confirm or deny.
P.S. I just had to give Uniman another K+ for beating me to it.

[uniman]

The man with dialup beat you again.

If you look at IGT eprom files you will see that all unused code is purposely written to zero.
This way nobody can add code later.

Universal didn't do this. All unused code was left full of 1's just waiting to be written to. And that's what Ron Harris did.
He chose Universal machines because of this lack of security.

Leaving unused code all 1's is bad security. 

One reason they are no longer around!

[jay]

Cool - Learn something new every day.

[stayouttadabunker]

Makes you wonder what data code Harris added to the chip to make it tell the CPU to hit the jackpot (playing certain amount of credits in a certain way). Of course, that was never revealed on the broadcast I had seen.

[jdkmunch]

Great posts  -- I know now when i changed everything to 0's in the eprom it wrote properly 
well since I already have a boatload of the UV chips I am going to dig a uv burner up on ebay.  They are not that expensive. 

[StatFreak]

Great posts  -- I know now when i changed everything to 0's in the eprom it wrote properly 
well since I already have a boatload of the UV chips I am going to dig a uv burner up on ebay.  They are not that expensive. 

I have that same eraser and it works fine. I think a lot of us non-pros have it (Pros need something bigger & faster - stronger light). You can fit a maximum of seven 28-pin EPROMS in the tray at one time. Apparently, the Chinese don't have the Mayan concept of zero down, so they just left the zeros off of this thing. "3" means 30 minutes.   They also don't care much about customer safety. No, there's no lead in this thing, but there's no safety cutoff for the UV light when you pull the cheap plastic tray out either.   They also have a fancy way of letting you know that the lamp is on and exciting those chips: there's a hole in the front of the door!  ..Now dat's sum Hy-Tekc darr.

You will usually want to set the timer for 35 minutes to ensure erasure of two or three chips. I've used as little as 20 minutes, but no guarantees. The less written to the chip (the more FFs) the less time it takes to get it erased. If you're in a hurry you can always check the chips (blank test) and return them to the eraser if they're not done. You shouldn't be in a hurry though. You can just use more blank chips to correct your mistakes, etcetera, while you're erasing your prior errors.

Of course, if that's too slow, there are these personal erasers:

The PE-140T and PE-240T are the best low-cost, desk-top UV EPROM erasers. They are the fastest, most efficient units of their size and are specially designed for personal and low volume users.

http://www.advin.com/uv-eprom-eraser-lv.htm

I think I even saw one of these on Joey's workbench, but it might have been a different manufacturer.
While these may be very good units, I don't think many of us home slot owners would be willing to spend over $200 for a "personal" eraser.

[tacman]

Hey, they copied that model from plans stolen from NASA.  BTW a small bolt and electrical wire cap makes that hole now a handy dandy tray handle 

 Dan (tacman)

[StatFreak]

Hey, they copied that model from plans stolen from NASA.  BTW a small bolt and electrical wire cap makes that hole now a handy dandy tray handle 

 Dan (tacman)

If you used a clear plastic handle you could have your light and handle too. 

[stayouttadabunker]

OR.........I could hook it up to a remote control......       me >>>I'm losing it......ARGHHHHH!!

[Joeylc]

Hey, they copied that model from plans stolen from NASA.  BTW a small bolt and electrical wire cap makes that hole now a handy dandy tray handle 

 Dan (tacman)

If you used a clear plastic handle you could have your light and handle too. 

LIGHTED HANDEL !!!!  



# Trigger players interest in your handle machines with our new illuminated handle ball
# Can be illuminated in any color by 2 multi color LED’s controlled from the host machine
# Flashing, glowing, or any light pattern is possible
# Lightens the dark gap between slot machines
# Durable sonic-welded construction ensures a long lifetime
# Supplied with a special drilled handle to connect the wiring inside the unit

http://www.happcontrols.com/gaming/accessories/121708.htm

[stayouttadabunker]

$50 dollars a ball PLUS Happs controls famous shipping charges.........whooo whee!

(Do I sound just a little bit SARCASTIC)?  ....just kidding around...


I wanna make one.....lol....gotta go "ball" shoppin'    that didnt come out right...

[StatFreak]

$50 dollars a ball PLUS Happs controls famous shipping charges.........whooo whee!

(Do I sound just a little bit SARCASTIC)?  ....just kidding around...


I wanna make one.....lol....gotta go "ball" shoppin'    that didnt come out right...

 

I think they're cool. With one of these, a flashing dbv sign, and a topper, a machine could attract all sorts of Riff-Raff, and maybe even Magenta and Columbia.
(this crowd might be too square for that joke. Personally, I'd take Columbia. or better still, Janet.) 

[jdkmunch]

Radio Shack has this extractor for $9

http://www.radioshack.com/product/index.jsp?productId=2103244

I think I'll stop in later today

[Ron (r273)]

Radio Shack has this extractor for $9

http://www.radioshack.com/product/index.jsp?productId=2103244

I think I'll stop in later today

I use Result1 extractor.

http://www.myslotnotes.com/Bent%20Screwdriver.htm

Ron

[StatFreak]

Radio Shack has this extractor for $9

http://www.radioshack.com/product/index.jsp?productId=2103244

I think I'll stop in later today

It looks like the gray piece on the left might be the right tool for slot EPROMs, but it's hard to tell.

[jdkmunch]

It looks like it would work with the correct attachment.. The 28 pin adapter should suck the baby right out.

[jdkmunch]

Yeah - I looked online and my local store doesn't have it.  I have to go a few more miles to get one.   
No problem since I drove 300 miles  each way to get my last slot!   

[jay]

Stat they are all too old for you now.....
I haven't seen Tim Curry in much lately. I have heard rumors of a remake replacing meatloaf with jack black.

[jdkmunch]

Radio Shack has this extractor for $9

http://www.radioshack.com/product/index.jsp?productId=2103244
Do not buy. The item on the left is an ic installer. The remover is that little black thing.
Do

I think I'll stop in later today

It looks like the gray piece on the left might be the right tool for slot EPROMs, but it's hard to tell.

[tjkeller]

I think they're cool. With one of these, a flashing dbv sign, and a topper, a machine could attract all sorts of Riff-Raff, and maybe even Magenta and Columbia.
(this crowd might be too square for that joke. Personally, I'd take Columbia. or better still, Janet.) 

"Oh shit! What a bitch! Quick, Magenta, Pull the switch!" 

[stayouttadabunker]

Stat,

We are NOT square....you keep pounding us on the head with that frying pan  ...we're flat now!

[jdkmunch]

Grrrrrrr all the EPROMs I bought have stuff on them..... It's off to eBay

[stayouttadabunker]

munch,
Did you get the "pre-written" eproms from that "Eprom-man" guy?

I'd tell him to send me his eprom eraser.... does he advertise as the eproms as new,
pulls, or erased?

[jdkmunch]

I did get them from epromman.com - He was very nice and is sending me the 30 chips that were not included in my order.  I guess he clearly states that they are used.     I just wanted to try and see if my backup would work.

I am still fuzzy on this:  If my original eprom is 27C512 and I read it and burn it to another 27c512 then why the need for the 00c000 offset?