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Forum Index : Microcontroller and PC projects : 2Nd SD-CARD help with pinouts

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sparkey

Senior Member

Joined: 15/06/2011
Location: Australia
Posts: 819
Posted: 11:23pm 31 Aug 2011
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this is for adding a second SD-CARD

:: SCK1A pin 49 clock to card

:: SDI1A pin 50 data input

:: SDO1A pin 51 data output


::: RD8 PIN 42 CARD ENABLE

:: RD10 PIN 44 CARD PRESENT

:: RD11 PIN 45 CARD WRITE PROTECT

CAN ANY BODY VERIFY THIS FOR ME PLEASE..... REGARDS SPARKEY
technicians do it with least resistance
 
Keith @

Senior Member

Joined: 19/06/2011
Location: Australia
Posts: 167
Posted: 02:15am 01 Sep 2011
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Hey sparkey

why the sudden interest in buying SD cards ..... thought you wanted eeprom?

and now you are looking at 2 SD cards on the 1 MaxiMite ... ????

Keith

The more we know, the more we know we don't know !
 
sparkey

Senior Member

Joined: 15/06/2011
Location: Australia
Posts: 819
Posted: 04:14am 01 Sep 2011
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that`s fascinating even the "trs-80" had twin floppys if you could afford them
technicians do it with least resistance
 
VK6MRG

Guru

Joined: 08/06/2011
Location: Australia
Posts: 347
Posted: 04:46am 01 Sep 2011
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I think that the reason early computers had 2 floppy drives was because of the amount of disk space at the time was 360k or less. So a program disk was used and the second disk was used for saving data. But now that we have 32Gig SD cards to use, I personally can't see any need for a dual drive Maximite. I have my autorun.bas pointing to a directory on the SD card, and save any log files to the root directory.
Have you thought of just using two different directories?
Its easier to ask forgiveness than to seek permission!

............VK6MRG.............VK3MGR............
 
sparkey

Senior Member

Joined: 15/06/2011
Location: Australia
Posts: 819
Posted: 04:54am 01 Sep 2011
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there are other peop`s creating all different types of mods for the max-m ..
why shouldent my mods account and for myself and any other peop`s any reason ...other than the fact that it may well be possabile
technicians do it with least resistance
 
wizard

Newbie

Joined: 29/07/2011
Location: United States
Posts: 38
Posted: 02:42pm 01 Sep 2011
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Hi All,

2nd MMC/SD card is a VERY good idea.

But a MUCH simpler way is to:

Use card present input as a /CS for the 2nd SD card.

Write protect can even be repurposed as /CS for a 3rd SD card!

The driver needs to be taught to talk to one card at a time (not hard). And
the language(s) need to tell the driver which card they want to talk to.

My breadboard has 2 - SD cards for all the reasons already mentioned!

warm regards,
Wiz
 
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