Have a look at: http://www.baltissen.org/newhtm/cbmhd.htm Ruud's the main guy behind the 1541 IDE project I mentioned to you, (and is on the CBM hacker's list I also mentioned) but he does have an IEEE <> PC project on his site as well. I've been meaning to look at the IEEE version myself; if you try it out, share your experience (as will I if I get to it first). mike --------------------------------------------------------------------------------------------- Message: 12 Date: Wed, 30 Jan 2008 02:19:23 +0000 From: Ethan Dicks <ethan.dicks at usap.gov> Subject: Has anyone ever written a standalone Commodore disk drive To: cctalk at classiccmp.org Message-ID: <20080130021923.GA7074 at usap.gov> Content-Type: text/plain; charset=us-ascii Hi, Commodore folks, I have just tracked down an ISA IEEE-488 card and was thinking that it might be interesting to use it to build an older PC into a Commodore diskette drive emulator - I recall there are various projects to interface modern hardware to PETs (like the C2N232 I have with me), but the idea in this case is to allow existing apps to work as if there were a real C= drive hanging off the PET's IEEE port. Essentially, the PC would act as closely to, say a 4040, as possible. My thought was that if I had a real IEEE-488 interface, it could handle the physical-layer protocol, and the emulator would only have to handle sending and receiving command strings and data. The virtual diskettes would be, of course, image files. I'm not really as worried about RELative files - more along the lines of "direct access" files where the code running on the PET wants to read and write individual sectors, ignoring the C= DOS filesystem. That is, in fact, the major reason for trying to emulate drives in the first place - if it was just a case of loading and saving streams of data as files, the C2N232 does a fine job of that (and costs on the order of $10 to breadboard). There seem to be a number of ways to emulate C= IEC-bus devices (such as the 1541-III), but not for the IEEE-488. If anyone can point me at any existing projects, even if they are incomplete, it would be a big help. Thanks, -ethan -- Ethan Dicks, A-333-S Current South Pole Weather at 30-Jan-2008 at 02:00 Z South Pole Station PSC 468 Box 400 Temp -34.8 F (-37.1 C) Windchill -57.9 F (-50.0 C) APO AP 96598 Wind 7.9 kts Grid 45 Barometer 674.7 mb (10829 ft) Ethan.Dicks at usap.gov http://penguincentral.com/penguincentral.html