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i have noticed when i try to burn ss chip that some 64 chips do not work on s2000 processor boards what cryteria do i need to look for and where can i buy the right chips

From: http://newlifegames.net/nlg/index.php?topic=11690.msg101565#msg101565

I have used upto a 150ns chip. a 200 or 250 will not work or will give poor results

I did some compareing and found the chip must have a vpp of at least 12.75v to work and ive had succes with 200ns chips and m27c512 chips

The best chip I've used is the SST27SF512.
I can re-write over and over and do not need a UV eraser.  :89-
Erases electronically!  :71-

I get tired of the same game in my machine -
especially if it's in there for more than a couple of weeks... :72-

I agree with Bunker...They are great chips. I also picked up some Winbond W27e512-70 chips that are electronically eraseable as well. This guy in Tel Aviv Isreal lists them every once in a while. Last time he listed them 30 for $25 shipped ! I bought 90 from him and they are great !!!

Bunker are you saying instead of using a 27c64
you can use a  SST27SF512 in its place with a SB1000 ?

Tim

yep! :89-
Just copy&paste the data 8 times to fill the chip because
I don't recall where it's supposed to go anyways...lol

Offhand, I think it's supposed to start at OFFSET 4000 or OFFSET 8000?
It doesn't matter when you copy it 8 times...lol

Cool I will add this to my notes  :88-

Tim

So you don't have to play those 0Xc0FFF games anymore?

haha....right!


A little birdy told me once that all you need to do is place the cursor on
the last bit and hit "ctrl, shift & home" and it copies the first block of data.
Then place the cursor on the next open byte or offset line and hit "paste".

Do this 8 times in all or just 4 times and hit the ctrl,shift & home again
to copy& paste once more - to fill the whole chip.

Bunker are you saying instead of using a 27c64
you can use a  SST27SF512 in its place with a SB1000 ?

Tim
[/quote]


Tim  Or you can use a 27C256 and copy it 4 times.  Or as a example I needed to burn a VS011GX1 and didn't have a blank M27C1001, so a used a M27C2001 and copyed it twice.

Or you can use a 27C128 and copy it 2 times...   :200-

While I'm sure most burners will do the offset, I've always just used this command in a batch file. I used 1.bin since it's easy to remember. I just rename a copy of the original to 1.bin, run the batch file and then rename the 27512.bin output file to whatever it is supposed to be. Of course the number of times you do a 1.bin+1.bin depends on what you are converting to what.

copy /b 1.bin+1.bin+1.bin+1.bin+1.bin+1.bin+1.bin+1.bin 27512.bin /b

The correct file offset when using a 512k chip with a 64k SS file when used in the S+ is 0xC000 (page 7 of 8). However, the S2000 might put power to a different group of the top address pins, which would change the offest that gets read. I don't know which because I don't own an S2000. I would recommend copying the data to all pages, as poppo suggests, when burning a 64k SS file to a 512k chip to be used in an S2000, unless an s2000 owner can post and let us know which page is actually being used.


For those who use HxD and are uncomfortable with the DOS command that poppo posted, you can open the 64k file in HxD, press <ctrl>A to select all, press <ctrl>C to copy to the clipboard, then press <ctrl>V  8 times (the first will overwrite the page, but it's simpler and faster to do this. Save the file under a different name so that you don't lose the original.

HxD will give you a warning each time you lengthen the file unless you check the "do not ask this question again" box. You can change the warning option anytime you like by going to the Extras menu and selecting Options (so you can disable it for these page copy operations and turn it back on when you're doing other types of editing.)

To summarize for HxD:
Open the 64k file.  Press the following keys:
<ctrl>A
<ctrl>C
<ctrl>V  as many times as there are pages in the larger file (e.g., 4 times for a 256k chip, 8 times for a 512k chip, etc.)  Deal with the warning message however you wish.
Save the file AS a new file with a different name.
Close HxD

If you turn off the warning message, you will find this method extremely fast and simple.

The S2000 does not need an offset
The 27C512 or the 27SF512 work just fine without the offset.
Any EPROM or EEPROM or Flash Chip you use must be 120ns or faster or that chip may not pass the memory and CRC tests in the S2000.

im not sure wich page is being read and im not all that technical but all i had to do was load the file and hit program on my chip burner and ive done it a few times now with no issues on my s2000 using 512k chips