Author Topic: Fast ACSI-CF adapter  (Read 1093 times)

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Offline Petari

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Fast ACSI-CF adapter
« on: 01-04-2016, 13:28:39 »
http://atari.8bitchip.info/astide.php

Soon built adapters available. Because this works best with Sandisk compact flash cards, and they are very picky by write, it takes more time to make proper PCB for this.


Offline Petari

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Re: Fast ACSI-CF adapter
« Reply #1 on: 01-04-2016, 13:33:42 »
I copy here post of Exxos_uk  from CATA thread, as that in another adapter:

CF is under development ;)

http://www.exxoshost.co.uk/atari/last/ACSICFS/index.htm

Its not been updated for some time, but I sent Peter next prototypes to test as I'm flooded with all sorts of work at the moment. Maybe there should be a new thread about this project ?

Offline exxos_uk

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Re: Fast ACSI-CF adapter
« Reply #2 on: 01-04-2016, 17:43:08 »
Cool :)  Actually I have not much work on next week, so I will start building a PCB to test myself Monday :)

I'm not going to bother posting on AF about this project, stupid as you can't properly post there anymore. All the hostilities are very tiresome anyway between people.

Anyway..
(ok can't attach files to messages here?)


So new PCB layout. This time 4 layers as CF cards seem very sensetive to supply rail noise. Anything over 20mV noise seems to cause issues. So this time I have  a 5V regulator to power CF card. Also now dedicated layer for GND and 5V and better routing of signals.

Also I added in a buffer on the datalines with pullups each side.  This might not be necessary, but I think the CF data inputs are very sensitive to noise also.  So the buffer should help clean up DMA signals.  Mostly I had read problems until I added regulator. 

The current issues is write problems.  I think when CF drive the databus, the DMA works good. But when DMA drive the databus to write to CF, it has random corruption.  So hopefully the buffer will solve write issues, but it is still unknown what is exactly causing it.

Also added in a variable resistor space as Peter was complaining about that for some time ;)