Help in making a coleco cart.

[Dan6305]

Any help in this matter would be appreciated.

I am using old Colecovision catridge boards to put other eproms in them.

Some carts have 2 eproms in them(Space Panic and Carnival) and others have 3 proms in them(Donkey Kong). I did burn the game on a 27c512 eprom.

How do I get one 16K OR 32k game eprom to work on these old Coleco game boards. I have de-soldered the old chips and soldered in sockets to swap out chips.

Thanks to anyone that can help!

[PkK]

You don't. The original pcbs won't work with 27C512. You'll have to use the same type that Coleco used. EPROMS with higher capacity will need additional logic.

[Dan6305]

You don't. The original pcbs won't work with 27C512. You'll have to use the same type that Coleco used. EPROMS with higher capacity will need additional logic.

980630[/snapback]

 

 

Thanks!! That gets me going in the right direction. One more question.

If the cart used 2 2764 eproms or 3 2732 for 16K and 12K games how do you break up the 16k bin game file to go onto 2 chips. Is it the first 8K on one chip and the last 8K on the other? Help.

Thanks Again!

[+Mitch]

Hmm, are there actually any 12k games?

 

From what I remember it's like this:

8k = 1 2764

16k = 2 2764s

24k = 3 2764s

32k = 4 2764s

 

If you have a 16K game BIN, then you split it in half and put it on two 2764s.

 

Mitch

[Dan6305]

Hmm, are there actually any 12k games?

 

From what I remember it's like this:

  8k = 1 2764

16k = 2 2764s

24k = 3 2764s

32k = 4 2764s

 

If you have a 16K game BIN, then you split it in half and put it on two 2764s.

 

Mitch

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I do think you are are about 12K games. What made me think that, in Donkey Kong there are 3 proms in it. They are 24pin and only say Coleco. If DK is a 16K cart what K are the 3 proms on the board?

Thanks for the replies!!

Dan

[Bruce Tomlin]

Any help in this matter would be appreciated.

I am using old Colecovision catridge boards to put other eproms in them.

Some carts have 2 eproms in them(Space Panic and Carnival) and others have 3 proms in them(Donkey Kong). I did burn the game on a 27c512 eprom.

How do I get one 16K OR 32k game eprom to work on these old Coleco game boards. I have de-soldered the old chips and soldered in sockets to swap out chips.

Thanks to anyone that can help!

You can't. The old boards are all for 24-pin chips. It's way too much work even for a scrounger like me.

 

Get the Pixels Past boards and use a 27256 (32K) or 27128 (16K).

[+Mitch]

Hmm, you're right Bruce, that's what I get for checking an Activision board instead of a Coleco one.

I just opened a Donkey Kong and it has two 8K 24 pin PROMs, obviously not pin compatible with a 2764.

 

Dan, I second Bruce's recomendation of the Pixels Past boards, that's what I use for testing myself.

 

Mitch

[Bruce Tomlin]

The reason your Donkey Kong has 3 chips is because it's the 24K version. There was some obscure bug in the 16K version, and the fix made it go over 16K. The chips are 24-pin 8K ROMs. There is no standard EPROM equivalent for that pinout. (Motorola did make a 24-pin 8K EPROM, but it uses a significantly different pinout.)

[Dan6305]

The reason your Donkey Kong has 3 chips is because it's the 24K version.  There was some obscure bug in the 16K version, and the fix made it go over 16K.  The chips are 24-pin 8K ROMs.  There is no standard EPROM equivalent for that pinout.  (Motorola did make a 24-pin 8K EPROM, but it uses a significantly different pinout.)

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Thanks to all who have replied!! The Coleco carts that have two 2764 eproms in them. I did erase them. Can a different game be burned on them by loading the 16K bin file and splitting it between the two eproms? I am using a rommax epromer. My split function does it by even and odd hex numbers. I do not think thats the proper way. I am VERY new at this so all info is a great help.

Thanks to all again!

Dan

[PkK]

> My split function does it by even and odd hex numbers. I do not think thats the proper way.

 

Try putting the lower 8K in one EPROm and the upper 8K into the other.

[Bill Brasky]

I believe Gateway to Apshai is only 12k.

[+Mitch]

I believe Gateway to Apshai is only 12k.

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Hmm, my copy is 16k.

 

Mitch

[Bruce Tomlin]

Look again. I think you'll find that the last 4K in your rom file is a duplicate of the previous 4K.

 

Although, to be completely pedantic, it's 144 bytes short of 12K.

Edited December 23, 2005 by Bruce Tomlin