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scrappysphinx

United Kingdom
15 Posts

Posted - 02/21/2017 :  11:18:37  Show Profile  Reply with Quote
Hi all, i have recently purchased a Sega CDX console and am looking to replace the bios with a multibios (switched by pic chip) one as seen here

h**p://wolfsoft.de/wordpress/?p=478

As you can see in the link the original bios is a 40 pin surface mount mask rom which can be replaced with a 27c4096 eprom to allow multiple bios (Eng/Usa/Jap) or a single region free bios on a 27c1024. I know this works as i've done it before but its quite messy and i'd prefer to just directly replace the original chip.

So does anyone know of a 40 pin surface mount chip thats pin compatible with a 27c1024 or 27c4096?

Thanks for any help

Reply #1

anniel

1225 Posts

Posted - 02/22/2017 :  04:18:23  Show Profile  Reply with Quote
27c1024 and 27c4096 are both available in SOP40 and TSOP40.
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Reply #2

supervizeur

462 Posts

Posted - 03/31/2017 :  10:21:40  Show Profile  Reply with Quote
Same pin-outs?
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Reply #3

anniel

1225 Posts

Posted - 03/31/2017 :  11:42:44  Show Profile  Reply with Quote
SOP yes TSOP no.
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Reply #4

supervizeur

462 Posts

Posted - 04/01/2017 :  12:17:36  Show Profile  Reply with Quote
Thanks Anniel!
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Reply #5

scrappysphinx

United Kingdom
15 Posts

Posted - 05/08/2017 :  06:45:34  Show Profile  Reply with Quote
So i've been searching for these sop40 27c chips and cannot seem to find any.

Any chance of a link or part number to search for?

The original bios chip (big SEGA chip) can be seen in the image attached

Image Insert:

442115 bytes
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Reply #6

anniel

1225 Posts

Posted - 05/08/2017 :  09:24:17  Show Profile  Reply with Quote
Here is an exemple MX27C1024MC-XX where XX is the access time you want.
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Reply #7

scrappysphinx

United Kingdom
15 Posts

Posted - 05/16/2017 :  07:38:54  Show Profile  Reply with Quote
Thanks for the reply and your help, i can find datasheets for the chips but cannot find any actual chips for sale in that package type. Guess i'll have to wire up the 40pin eprom instead.
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Reply #8

anniel

1225 Posts

Posted - 05/16/2017 :  08:17:59  Show Profile  Reply with Quote
Some specific chips and package sizes go fast. Try to find devices that used the particular chip you need, you can then scavenge the boards.
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Reply #9

anniel

1225 Posts

Posted - 05/16/2017 :  08:19:13  Show Profile  Reply with Quote
You can also use adapter boards.
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Reply #10

supervizeur

462 Posts

Posted - 08/03/2017 :  05:34:51  Show Profile  Reply with Quote
quote:
Originally posted by anniel

Some specific chips and package sizes go fast. Try to find devices that used the particular chip you need, you can then scavenge the boards.



+1
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Reply #11

supervizeur

462 Posts

Posted - 08/03/2017 :  05:35:23  Show Profile  Reply with Quote
quote:
Originally posted by anniel

You can also use adapter boards.



That's the simplest way.
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Reply #12

JasperCastillo

United Kingdom
1 Posts

Posted - 10/10/2018 :  12:15:05  Show Profile  Reply with Quote
quote:
Originally posted by anniel

27c1024 and 27c4096 are both available in SOP40 and TSOP40.



Hey
Thnx for your help it will be very helpful to me

jasper
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Reply #13

anniel

1225 Posts

Posted - 10/10/2018 :  14:26:27  Show Profile  Reply with Quote
quote:
Originally posted by JasperCastillo

quote:
Originally posted by anniel

27c1024 and 27c4096 are both available in SOP40 and TSOP40.



Hey
Thnx for your help it will be very helpful to me




You're welcome.
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