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Author Topic: 27C512-10F1 27C128A-12F1  (Read 2066 times)

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Offline shortrackskater

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27C512-10F1 27C128A-12F1
« on: March 28, 2019, 03:41:28 PM »
What the heck is the difference between a 27C512-10F1 and a 27C128A-12F1 ??
These are the EPROM's for a Bally Game Maker.
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Re: 27C512-10F1 27C128A-12F1
« Reply #1 on: March 28, 2019, 04:35:06 PM »
I presume you are referring to the 10 vs 12 in the part number.  Those are the speed of the chips. 100NS for the 10 and 120NS for the 12
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Re: 27C512-10F1 27C128A-12F1
« Reply #2 on: March 28, 2019, 05:16:15 PM »
Does the speed matter for a Game King Maker  7200 and 7000? I've used 100ns in the past.

I just found this which may have answered my question.
http://newlifegames.net/nlg/index.php?topic=2145.0
« Last Edit: March 31, 2019, 03:18:12 PM by shortrackskater »
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Re: 27C512-10F1 27C128A-12F1
« Reply #3 on: March 31, 2019, 03:17:24 PM »
But... still wondering if there's a difference, or noticeable difference (or Bally recommended speed I guess)  in the Game Maker?
(CORRECTED, sorry I said Game King)
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Re: 27C512-10F1 27C128A-12F1
« Reply #4 on: March 31, 2019, 07:49:27 PM »
27C512's are 4 times larger in data capacity size than the 27C128's for one thing - that's a huge difference.

The speeds shouldn't be noticeable...20 nanoseconds? lol That's quite minuscule to say the least.
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Re: 27C512-10F1 27C128A-12F1
« Reply #5 on: April 01, 2019, 08:22:56 AM »
Quote from: Stayouttadabunker on March 31, 2019, 07:49:27 PM
27C512's are 4 times larger in data capacity size than the 27C128's for one thing - that's a huge difference.

The speeds shouldn't be noticeable...20 nanoseconds? lol That's quite minuscule to say the least.

But that's 20 nanoseconds of my life I could have saved!  :hissyfit:  :rotfl:

I just don't know enough about eproms and if, for some reason unknown to me, that a minuscule difference in chip speed made a larger difference in game loading/operation.
You answered another question too - my eprom reader always auto selects 27c128 by default for a 27c512.
I'll learn all this eventually, maybe.
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Re: 27C512-10F1 27C128A-12F1
« Reply #6 on: April 01, 2019, 10:26:24 AM »
Quote from: shortrackskater on April 01, 2019, 08:22:56 AM
I'll learn all this eventually, maybe.

You might be asking the questions but I'm lurking and learning too...thanks...
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Re: 27C512-10F1 27C128A-12F1
« Reply #7 on: May 06, 2019, 06:57:00 PM »
The speed is the access time for the chips.  Some systems require a specific access time, or the game will either hiccup or just error out.  For 7000 series game maker, 120ns is probably fine.  But if they are used and they have had many write/erase cycles, the speed is somewhat compromised.  So if you are buying used eproms, I would always buy -10's if available, even though -12 will probably work fine.
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Re: 27C512-10F1 27C128A-12F1
« Reply #8 on: May 07, 2019, 09:11:28 AM »
Quote from: rickhunter on May 06, 2019, 06:57:00 PM
The speed is the access time for the chips.  Some systems require a specific access time, or the game will either hiccup or just error out.  For 7000 series game maker, 120ns is probably fine.  But if they are used and they have had many write/erase cycles, the speed is somewhat compromised.  So if you are buying used eproms, I would always buy -10's if available, even though -12 will probably work fine.

 :thank_you:
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