Re: How do I make boot floopy? IMSAI + Northstar + CP/M?
- --- In email@example.com, Systems Glitch <systems.glitch@...> wrote:
>My IMSAI is running on the capacitors that came with it, as is the Cromemco Z-2D and CompuPro 8/16. That doesn't mean yours are guaranteed good, of course. Do bring it up on a variac to help in the reforming process if you want to try and keep the old caps.So is mine, they are very good capacitors. I brought them up slowly then did a ripple test on them.
Power supply = 8.2V while drawing 5Amps with 620mV ripple.
Looked good enough for me. Last I checked, the drop out voltage of those 5V regulators was 7V.
> Looked good enough for me. Last I checked, the drop out voltage of those 5V regulators was 7V.Yup, that's sufficient! They'll regulate down to 7V; in fact, that's what I run my DC bench supply at when I use it with a small S-100 backplane. The 78/79 series regulators have pretty good ripple rejection if you provide adequate bypass around them.
> telmnstr@... wrote:http://www.classiccmp.org/dunfield/img/index.htm
> > I just looked. MDC-A4 is the floppy controller.
> Ah well... I owe Jonathan a beer. As he pointed out, this
> is not good news. The CP/M stuff on Dave Dunfield's site
> is double density. You should probably follow his lead
> from here on out. I've never played with the one single
> density N* controller I have and I've never played with N*
> Bill S.
I dont' have time tonight to check Dunfield's disk images, to see if he has single-density N* disk images. Check for yourself, later. But his Northstar NST serial transfer tools may be of some use to you. Since Dave's disk imaging can't make hard-sectored diskettes, he uses the native system to create or read the disk image and transfers it by serial cable to the MS-DOS system where the image files are created/read.
People re-invent this technology over and over again; Dave's had a set of these transfer tools for various systems, for some time.
> I dont' have time tonight to check Dunfield's disk images, to see if he has single-density N* disk images.Yes, he does...no CP/M but plenty of North Star DOS and related applications/usergroup disks.
> But his Northstar NST serial transfer tools may be of some use to you.It definitely works with single-density disks, that's how I made mine. I don't recall right off whether I had to do anything special for single-density.
> People re-invent this technology over and over again; Dave's had a set of these transfer tools for various systems, for some time.Sticking with a known-good imaging system and image format also helps to grow the available software for the community.