6502.org Forum Projects Code Documents Tools Forum
It is currently Sat Nov 23, 2024 8:28 am

View unanswered posts | View active topics


Board index » 6502.org Users Forum » Hardware

All times are UTC




Post new topic Reply to topic  Page 2 of 2
  [ 23 posts ]  Go to page Previous  1, 2
  Previous topic | Next topic 
Author Message
BigDumbDinosaur
 Post subject: Memory storage
PostPosted: Wed Nov 02, 2011 9:35 pm 
Offline
User avatar

Joined: Thu May 28, 2009 9:46 pm
Posts: 8507
Location: Midwestern USA
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.

_________________
x86?  We ain't got no x86.  We don't NEED no stinking x86!
Top
 Profile  
Reply with quote  
Dajgoro
 Post subject:
PostPosted: Thu Nov 03, 2011 12:11 am 
Offline
User avatar

Joined: Mon Aug 08, 2011 2:48 pm
Posts: 808
Location: Croatia
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...
Top
 Profile  
Reply with quote  
GARTHWILSON
 Post subject:
PostPosted: Thu Nov 03, 2011 12:22 am 
Offline
User avatar

Joined: Fri Aug 30, 2002 1:09 am
Posts: 8544
Location: Southern California
Quote:
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.
Top
 Profile  
Reply with quote  
Dajgoro
 Post subject:
PostPosted: Thu Nov 03, 2011 11:52 pm 
Offline
User avatar

Joined: Mon Aug 08, 2011 2:48 pm
Posts: 808
Location: Croatia
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?
Top
 Profile  
Reply with quote  
BigEd
 Post subject:
PostPosted: Fri Nov 04, 2011 5:22 am 
Offline
User avatar

Joined: Thu Dec 11, 2008 1:28 pm
Posts: 10986
Location: England
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.

Top
 Profile  
Reply with quote  
Arlet
 Post subject:
PostPosted: Fri Nov 04, 2011 6:54 am 
Offline
User avatar

Joined: Tue Nov 16, 2010 8:00 am
Posts: 2353
Location: Gouda, The Netherlands
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.
Top
 Profile  
Reply with quote  
Dajgoro
 Post subject:
PostPosted: Wed Dec 21, 2011 5:58 pm 
Offline
User avatar

Joined: Mon Aug 08, 2011 2:48 pm
Posts: 808
Location: Croatia
How could this be used with the 6502?
http://elm-chan.org/fsw/ff/00index_p.html
Top
 Profile  
Reply with quote  
BigEd
 Post subject:
PostPosted: Wed Dec 21, 2011 7:21 pm 
Offline
User avatar

Joined: Thu Dec 11, 2008 1:28 pm
Posts: 10986
Location: England
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
Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  Page 2 of 2
  [ 23 posts ]  Go to page Previous  1, 2

Board index » 6502.org Users Forum » Hardware

All times are UTC


Who is online

Users browsing this forum: Google [Bot] and 16 guests

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
6502.org is an ongoing project by Mike Naberezny and contributors.