Re: USB to IEC

> On Jan 2, 2020, at 3:35 PM, André Fachat <afachat_at_gmx.de> wrote:
> Am 3. Januar 2020 12:14:48 schrieb Nate Lawson <nate_at_root.org>:
> 
>> I routed the signals on the ZoomFloppy to allow the PC to be used as a drive.
> 
> So you did something like that already? Is it available somewhere?

No, I just made sure the board would support this case if later desired. Never did any software work on it.

> 
>> It would require a lot of firmware work though. You need to bring in
>> filesystem support in order to enable mounting images like the SD2IEC, for
>> example.
> 
> Once you are at the level of IEC logic (Talk/Listen, sec*, iecin/-out) the
> work is already done in the XD2031 firmware I mentioned.

Neat. The existing xum1541 code could be used as an example or borrowed then for your XD2031 project. You’d just have to add USB serial protocol support, which is already in the LUFA library and port the various IEC routines.

Certainly this could be built as an alternate firmware for the ZoomFloppy board. I’d have to hear a good argument for merging it into a single build that is software-switchable between host and drive mode though.

If someone wants to do the work, I can explain where to look in the code. BTW, why did you create the XS-1541 when the ZF existed and was fully open-source beforehand?

> 
>> I don’t think the effort of implementing this is worth it, given how cheap
>> a PI1541 is.
> 
> Well, there are other use cases that (probably) won't work with the PI1541:
> when I develop code I just build it into a folder on the PC and reload from
> the CBM side...
> 
> But the Raspberry Pi is a viable alternative - if someone builds a
> driver(?) that provides the IEC logic level e.g. via socket, the XD2031
> firmware should almost automatically work (I use a socket based driver for
> the test suite)
> 
> As far as I understand the Pi does not have enough pins for an IEEE488
> interface, or does it?
> How is the ATN response done in Pi1541? In the Atmega world I could use an
> interrupt for that, would the Pi be fast enough?
> 
> With XD2031 you then (already now) could mount d64 etc, or even telnet to
> the internet, or mount ftp or http servers as drives...

No idea on any of these questions. 

-Nate

>>> On Jan 1, 2020, at 6:16 AM, Ruud_at_baltissen.org <Ruud@Baltissen.org> wrote:
>>> 
>>> Hallo allemaal,
>>> 
>>> 
>>> I just received an email from someone who has a C64, 1541 and a
>>> modern PC, Windows 10, no LPT or COM port. The 1541 appears to be
>>> bad and he wants to use the PC as drive. 64HDD is out of the
>>> question so he needs an USB to IEC solution. But, to be honest and
>>> happy with my SD2IEC,Ultimate and IEC-ATA, I couldn't think of
>>> anything.
>>> 
>>> OK, there is Zoomfloppy but that is the other way around. And I
>>> wonder if it can be used in reverse mode. So the question: doea any
>>> of you know of such a device?
>>> 
>>> He is known with hardware and programming so I gave him the advice
>>> to at least have a look at SD2IEC as a starter.
>>> 
>>> Thanks for any input!
> 
> 
> 
>