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BigDumbDinosaur
 Post subject: Memory storage
PostPosted: Wed Nov 02, 2011 9:35 pm 
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BigEd wrote:
Maxim have an app note talking about the power conditioning problem - they are selling a solution of course.

And at a substantial price. :lol:

Some careful design and a super-capacitor or CR2032 cell, along with a 512K x 8 SRAM can accomplish the same thing for about half the cost. You'd be trading time, board real estate and ingenuity for money, of course. Sequencing isn't that difficult as long as Vcc is higher than the nominal 3.0 VDC of the CR2032.

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Dajgoro
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PostPosted: Thu Nov 03, 2011 12:11 am 
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I have one HM628512 sram, i bought it for storing data from a/d converters, and for a digital analyzer project. I could use it for permanent data storage, but i would prefer other memories. If i am going to use i2c i will need a interface controller also, which raises the price... It would be great if 8BIT's SPI-IDE Interface would have a bus interface like my keyboard/lcd... pic interface...
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GARTHWILSON
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PostPosted: Thu Nov 03, 2011 12:22 am 
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If i am going to use i2c i will need a interface controller also, which raises the price.

Not really. I've bit-banged I²C with the 6522 many times. It's quite easy.
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Dajgoro
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PostPosted: Thu Nov 03, 2011 11:52 pm 
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Ok, is there hope for the hard drive option? And the microcontroller for the ide interface is a bit hard to find... Any other solutions?
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BigEd
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PostPosted: Fri Nov 04, 2011 5:22 am 
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Looks like Lee has a (mostly) TTL solution for IDE.

There's an even simpler one here which treats IDE as having an 8-bit data bus - I think the idea here is that you just use half the bytes on the device - commands need only the bottom 8 bits, and for data transfers you leave the upper 8 bits alone. You won't be able to share removable media if you do this, but it is simpler.

Cheers
Ed

Edit to add: (I don't mean anything against any of the SPI-based solutions by the way. But if you happen to have old CF cards or IDE drives around, or are looking for a TTL-level solution, an IDE interface has some appeal)


Last edited by BigEd on Fri Nov 04, 2011 9:48 am, edited 1 time in total.

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Arlet
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PostPosted: Fri Nov 04, 2011 6:54 am 
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Dajgoro wrote:
Ok, is there hope for the hard drive option? And the microcontroller for the ide interface is a bit hard to find... Any other solutions?


Do you really need more storage than a 32GB SD card can provide ? Seems quite a lot for a simple 8 bit platform.
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Dajgoro
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PostPosted: Wed Dec 21, 2011 5:58 pm 
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How could this be used with the 6502?
http://elm-chan.org/fsw/ff/00index_p.html
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BigEd
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PostPosted: Wed Dec 21, 2011 7:21 pm 
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It's c, (a c library for FAT filesystem access) so the first step would be to have a go with cc65, I think. Then you'd need to connect it to some low-level SPI routines, or similar, if you wanted to connect to an SD or MMC card.

Cheers
Ed
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