Re: GPIB to USB interface

From: André Fachat <>
Date: Mon, 16 Apr 2012 00:18:57 +0200
Message-ID: <>
Not sure is libusb is necessary. The XS1541 connects as serial device (IIRC with an FTDI serial-to-usb adapter).

Don't know about the ZoomFloppy though


-------- Original-Nachricht --------
> Datum: Sun, 15 Apr 2012 09:49:01 -0700
> Von: Nate Lawson <>
> An:
> Betreff: Re: GPIB to USB interface

> On Apr 15, 2012, at 7:42 AM, Jim Brain wrote:
> > On 4/15/2012 4:18 AM, A.Fachat wrote:
> >> Yes, the route to use CBM drives from the PC seems to be the exclusive
> route these days.
> >> 
> >> But I am also looking into using the PC as a floppy drive for my PETs.
> >> 
> >> I have done this over a serial line for my own 6502 operating system,
> so a server side is actually available. It's "just" a matter of writing an
> atmega client that works as drive and communicates with the PC via serial
> over usb.
> >> 
> >> I even have an XS1541 here but didn't have the time... But since my
> homebuilt printer-port ieee488 interface for the PC broke, and I am using
> cn232 with my only PC left with a serial i/f, the pressure gets stronger...
> > The ZoomFloppy hardware should support using the PC as a FD/HDD, and
> there is plenty of room in the uC for more code.  Alas, there's no code to
> implement that feature as yet.
> > 
> > Jim
> It can, but someone would have to write the firmware and host side of
> things to support that.
> Basically, it would be the following:
> Firmware would watch ATN/RESET inputs and respond to basic drive commands
> (talk, listen, etc.) No need to implement more advanced stuff like M-E
> (memory execute).
> Host would have a libusb program that polls for commands from the xum1541.
> Commands would correspond to the above ROM commands.
> Code could probably be adapted from the sd2iec project, which provides a
> virtual floppy drive backed by an SD card. You would just send commands over
> USB to access floppy images on the host side instead of the FAT fs and SD
> card driver in the sd2iec.
> -Nate
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Received on 2012-04-15 23:00:05

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