Hi! I've working on it the last two weeks. The hardware is almost finished (I
may be switching to another, more capable, CPLD if the current one doesn't fit
all my needs).
It's an external ROM board, with EPROM for firmware (to be written), CPLD
configured to act as an SPI interface, and a SD/MMC socket. Miscellaneous
electronics include an integrated oscillator (50MHz at present), and a 3.3V LDO
regulator.
I'm finishing low-level routines so once they are well tested, I will move on to
the next software level (filesystem, driver access, etc).
Until now, I present to you a demo of the read speed achieved with a white-brand
SD card, and a 640KB (should work on an unexpanded too) QL with Minerva 1.98 .
http://www.youtube.com/watch?v=78xtsEKW4Lw
This video is the last one uploaded to Youtube up to now. Previously I have
uploaded two more videos showing basic read tests using different speeds, and
comparing the results with the one obtained using a regular floppy drive.
http://www.youtube.com/watch?v=t0XvKy8wb-g
--
McLeod_IdeaFix (www.zxprojects.com)
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