On Wed, Apr 15, 2009 at 3:42 AM, Anders Carlsson <firstname.lastname@example.org> wrote: > Ruud Baltissen wrote: > >> we can replace the MFM-drive by any drive we like: > > Honestly though, aren't 90X0 drives mostly collectable? Sure, but the 90X0 drives are also repairable and somewhat modular, so for me, at least, fixing a broken DOS board is something obvious to do. If I had a dead drive or a dead "middle board", I'd more seriously consider either a more modern MFM drive (like an ST225) or some way to hang a drive or drive emulator (FlashROM) off of the SASI port so that the DOS board _thinks_ there's a drive out there. I'm not one to have a box just to look at - I want to run it if it works and fix it if it's broke. I know there are those out there who are more interested in a "complete" system because of how it looks. I am much more in the "use and repair as necessary" group. That being said, I probably wouldn't toss out an old TM602S or TM603S even if I did replace it for use with something more modern (even an ST225). > For > practical purposes of a storage device, I'm sure you can build something > that is both smaller, lighter and more durable from almost scratch. Sure. Since there's virtually no software that depends on DOS3.0 REL files, there's nothing particularly magical about the implementation of CBM DOS on the 90x0. One could design an entirely new IEEE-based storage device (and someone probably should), but since I already have a couple of D90x0 drives sitting around and because the IEEE hardware and firmware is done and known to be working on the DOS board, I always attacked the problem from the point of view of putting something different on the far side of the DOS board than the "middle board" and Tandon disk (especially since Tandons are odd and rare and expensive). I am not in a position to be designing an IEEE storage device from scratch, but if such a project comes around, I'd be happy to help debug and use it. The one thing that I'd want it to do is to support either floppy images (so U1/U2 commands work on the contents of the image) or have a way for an application to seek to an arbitrary position in a file and read a block. This is to support a virtual memory scheme for Infocom games. I have it working on floppy-based games (i.e. - just as Infocom did for the C-64), but am unable to migrate that to the D90x0. Some/most of the Flash-based IEC drive emulators that I've seen will let you mount a partition that's a .d64 file, which would completely suffice. -ethan Message was sent through the cbm-hackers mailing listReceived on 2009-04-15 16:13:51
Archive generated by hypermail 2.2.0.