SD/MMC 2.2+

by Gradius2 on 06-11-2010, 22:03
Topic: Hardware
Languages:

MSX Projects will release a professional version of SD/MMC v2.2+ in Brazil. It fixes a bug found in version 2.2 made by Sinfox. Delivery is expected to be December 2010. At start orders will be done within Brazil, followed with International orders after initial internal supply. Details of the SD/MMC 2.2+ can be read in this PDF.

Relevant link: MSX Projects

Comments (11)

By Huey

Prophet (2643)

Huey's picture

08-11-2010, 13:40

Just out of curiosity. What Bugs are we talking about? I never read/heard anything about bugs in the V2.2 design.......

By Gradius2

Hero (570)

Gradius2's picture

08-11-2010, 14:19

An IC is prepared to receive +3.3V TTL signals only and not +5V TTL as well, leading to speedy age, so it will die in few years and then will stop working. We fixed that by replacing with a correct IC able to use both, 3.3V and 5V. Besides that, we are using a modern, more reliable, and recent Flash (TSOP) and not the old, less reliable, and retired one (for over 5 years ago aka DIP).

By Huey

Prophet (2643)

Huey's picture

08-11-2010, 15:30

Ah! Ok Thanks.

By Gradius2

Hero (570)

Gradius2's picture

08-11-2010, 15:54

You are welcome. Smile

By kansaizine

Supporter (13)

kansaizine's picture

09-11-2010, 09:27

Which IC dies early ?

By Gradius2

Hero (570)

Gradius2's picture

09-11-2010, 20:58

74HC125

Regards,
Fernando Running Naked in a Field of Flowers

By kansaizine

Supporter (13)

kansaizine's picture

10-11-2010, 04:34

Thanks Gradius2(Fernando) !

Please let me some question.

1. It can repair if it replaces with new one when it dies ?
2. It can replace with other DIP IC (able to use both 3.3V and 5V) ?

By Bastiaan

Champion (331)

Bastiaan's picture

10-11-2010, 12:17

So I guess this bug was also solved in the Erikie version with the CLPD?

By usuario_msx2

Paladin (745)

usuario_msx2's picture

11-11-2010, 15:09

It's possible.....
but for now, all my DIY sharksym cartridges with 74HC125 works fine since 2004. And Sinfox cartridges works fine too

http://www.flickr.com/photos/44218601@N06/4543228574/in/set-72157623908993386/

By Gradius2

Hero (570)

Gradius2's picture

17-11-2010, 18:59

On Erikie's with the CLPD of course it will works, is pure emulation after all.

About "dying" it will happen in some years, don't except for fail in couple years. The more you use it, the less time it will takes.

By janghang

Expert (115)

janghang's picture

18-11-2010, 09:12

i am not sure about your claims for 74HC125. I checked a 74HC125 datasheet but its recommended condition was 2 to 6V. That means it supports both 3.3V and 5V. There are many users who have been using Sharksym's SD/MMC more than 3 years but I haven't heard anybody who had such problems with 74HC125. It would be great if you clear which bugs you fixed exactly.