15 Mar
2006
15 Mar
'06
8:42 p.m.
weve all seen the use of (typically) compact flash
cards as mass storage in classic stuph. Are SD cards
as adaptable for this purpose? I remember reading
somewhere that the flash interface is essentially IDE
in nature. Does this apply for all types of cards? And
if anyone could point to an article/link/book on this
type of crazy stuph, Id sore appreciate it. Nuts and
Volts had an article on building a micro controller
based mpeg player (with cflash storage) so maybe I
should take a look at that.
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16 Mar
16 Mar
3:34 a.m.
Chris M wrote:
weve all seen the use of (typically) compact flash
cards as mass storage in classic stuph. Are SD cards
as adaptable for this purpose?
no, sorry. while CF cards can be run in "true ide mode" which makes
them look essentially like IDE hard drives, SD & MMM cards use an
entirely different interface.
I could on and on but suffice to say:
- mmc cards are thinner. sd won't go in an mmc slot. sd cards are
thicker. sd slots can take mmc cards.
- both mmc & sd cards can use a simple 4 wire spi interface to allow
random block access (i.e. random access to blocks of data)
- the interface is very simple. I've done DOS/FAT file system access to
an MMC using PIC. I'm doing it as we speak with an Atmel SAM7S (in C).
I think there are a number of SD card interface sites on the web, as well
as specs for the interface.
I'm working on a "vintage computer to modern media" interface right now
and I've chosen CF & IDE - mostly becuase there are lots of pc based
interface to these, makeing interchanging the media simple.
-brad
3:43 p.m.
Brad Parker wrote:
I'm working on a "vintage computer to modern
media" interface right now
and I've chosen CF & IDE - mostly becuase there are lots of pc based
interface to these, makeing interchanging the media simple.
This is something I plan on trying next month, connecting a CF card to
my PC/XT's IDE adapter. The CF-to-IDE conversion card is very cheap,
like $15 + shipping.
--
Jim Leonard (trixter at oldskool.org) http://www.oldskool.org/
Help our electronic games project: http://www.mobygames.com/
Or check out some trippy MindCandy at http://www.mindcandydvd.com/
A child borne of the home computer wars: http://trixter.wordpress.com/
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brad＠heeltoe.com -
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