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T O P I C    R E V I E W
scrappysphinx Posted - 02/21/2017 : 11:18:37
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

13   L A T E S T    R E P L I E S    (Newest First)
anniel Posted - 10/10/2018 : 14:26:27
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.
JasperCastillo Posted - 10/10/2018 : 12:15:05
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
supervizeur Posted - 08/03/2017 : 05:35:23
quote:
Originally posted by anniel

You can also use adapter boards.



That's the simplest way.
supervizeur Posted - 08/03/2017 : 05:34:51
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
anniel Posted - 05/16/2017 : 08:19:13
You can also use adapter boards.
anniel Posted - 05/16/2017 : 08:17:59
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.
scrappysphinx Posted - 05/16/2017 : 07:38:54
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.
anniel Posted - 05/08/2017 : 09:24:17
Here is an exemple MX27C1024MC-XX where XX is the access time you want.
scrappysphinx Posted - 05/08/2017 : 06:45:34
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
supervizeur Posted - 04/01/2017 : 12:17:36
Thanks Anniel!
anniel Posted - 03/31/2017 : 11:42:44
SOP yes TSOP no.
supervizeur Posted - 03/31/2017 : 10:21:40
Same pin-outs?
anniel Posted - 02/22/2017 : 04:18:23
27c1024 and 27c4096 are both available in SOP40 and TSOP40.

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