... and finally I have booted! I had a 2nd dvi come in, and I just booted it using the disks I already had.
So now I have finally actually proven the cable parts, assembly directions, and pictures I put on tandy.wiki I went from famine to feast. I actually have *3* working original system disks now. The 2nd dvi came with a manual, and there was a system disk in a pocket in the back of that too. So next thing is to make some copies of those. Thanks for all the help along the way. -- bkw On Oct 31, 2017 9:19 PM, "Brian White" <[email protected]> wrote: > Thanks Mike. > > I have a Teac FD-55B-01-U on the way, which should be 360k. > > I also found another disk in the packing materials for my dvi. It doesn't > boot either but it looks like it is also a system disk, even though the two > disks look different and have different catalog numbers. > > https://photos.app.goo.gl/iyQgkHnuj55Is23t2 > > -- > bkw > > > On Oct 28, 2017 8:48 PM, "Mike Stein" <[email protected]> wrote: > > At a fast glance through the sparse documentation available it doesn't > look like any of those drives will do. > > Again, there's some confusing terminology here; I don't think Epson's dual > density is the same thing as double density and I think they're actually > talking about track density. There are three (formatted) possibilities: > 1.2 MB 96 tracks per inch, 500kbps > 740KB 96 tracks per inch, 250kbps > 360KB 48 tracks per inch, 250kbps. > > 740KB (sometimes called quad density) was not very common and Epson > probably means that their drive is only capable of two densities, 1.2MB HD > and 360KB DD as used in PCs and clones. > > The DVI disks are single-sided double density, with the same capacity as a > single-sided DD PC diskette but arranged as 40 tracks of 18 256 byte > sectors instead of 40 tracks of 9 512 byte sectors. The number and size of > sectors is a function of the controller, so the DVI drive is the same as > one side of a standard 360K DD drive as used in PCs and elsewhere. > > To read a DD diskette in an HD drive you need to slow it down from 360 RPM > to 300 RPM (or adjust the transfer rate) and you have to take two 80 TPI > steps for every 40 TPI step. It looks like an 'I' jumper on the Teac 505 > should make 300RPM available, and pin 2 would then enable it; unfortunately > there's no indication that it (or any of these drives) are capable of > double-stepping, leaving that up to the controller. > > But I could be wrong... > > m > > ----- Original Message ----- > > *From:* Brian White <[email protected]> > *To:* [email protected] > *Sent:* Saturday, October 28, 2017 4:09 PM > *Subject:* Re: [M100] DVI cable > > > On Oct 28, 2017 1:00 PM, "MikeS" <[email protected]> wrote: > > What's the make/model of the HD drive? Might be trivial to configure it to > read a DD diskette. > > > Epson SD-680L > Epson SD-600 combo > Teac FD-505 combo > And on the way in, Epson SD-521 > > The SD-680L looks nice and configurable, although this pdf suggests it's > not fully configurable, but maybe that just means it can't do *single* > density? > http://jope.fi/drives/40200A03.pdf > > Easy enough to try, so I will do that next. > > > Do you only have one system disk? > > > Yeah just the one. Looks original. Factory label that says Model 100 Disk > Operating System. Obviously I intended to make copies and only use the > copies, if it worked at least once. Maybe it still will work in a different > drive. > > Or I might possibly be able to use those disk images that Steven put up on > club100 to make a new disk from scratch. > > One of my old servers might possibly have a floppy controller that would > work. That would be a whole project of it's own, since everything probably > has bad caps. Otherwise I'm hoping one of you gents would be willing to let > me mail you a few blank disks and you run the backup util to make a couple > copies? > > -- > bkw > > >
