Re: USB to IEC

Hi Nate

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?

> 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.

> 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...

André

>
>
> -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!