USB I/O

[Opry99er]

Been studying some on USB I/O protocols...

 

I am having some difficulty searching for threads on here today from my mobile for whatever reason, so if this has been discussed at length, I would appreciate a link to the thread.

 

The serial bus architecture and data packet delivery system of the USB interface is fairly simple, so my question concerns interfacing, primarily.

 

Could a USB port be feasibly integrated into a RAMDisk-type board for use with a USB drive?

 

I have been referencing the EA manual and Thierry's pages for info on CRU and PAB requirements and it seems like it should be possible to at least load FROM a USB drive into the system.

 

(Again, if this has been covered, apologies)

 

IIRC, Tursi did a USB cartridge of some sort... Linux IIRC.

 

I know far less about I/O protocols and interfacing than most of you on here, but I am learning.

 

Would it be possible to format a USB card in such a way that plugging it into a theoretical RAMDisk-type card would allow reading AND writing to and from the device?

 

My initial thoughts were of an rs232 piggyback connection, but with no term program running on-board the device, our current software would not know what to do with it.

 

Links to info would be appreciated...

[+arcadeshopper]

there is a usb card as well.. no dsr for it though

 

http://www.unige.ch/medecine/nouspikel/ti99/usb.htm

[+OLD CS1]

So, essentially using a FAT-formatted USB stick as the "RAM" for a RAM disk?

[Opry99er]

What I was thinking was more like a standard RAMDisk that is mapped in such a way that would expect data packets in a certain order to be passed via a USB port into physical RAM chips/addresses on the card. Basically a big "copy".

 

Does that make any sense?

 

I do not have the vocabulary yet.

Edited May 16, 2015 by Opry99er