per's latest activity

For reference, if anyone else needs this info, what I mean by "ordinary 5-bit per nibble GCR", is to the point the GCR scheme described...

...and data! Did add it as a modulation type to Eric Smith's flux decoder tool, which he wrote in Python. Not the fastest thing around...

Tried to do some manual decoding from the timing-states, and yeah.. Seems like this is the ordinary 5-bit per nibble GCR. Seems like...

just stumbled upon this.. the cp/m 2.2 sources for the 2300 ! https://github.com/t52ta6ek/2300ADS-CPM

hopefully you will be able to recover the floppies I went through all of my boards, and I have a z80 2300 system board with a 2.1 boot...

Ok, after a lot of fine-tuning the final version is now done. Due to keeping surfaces nice and the details of the print sufficiently...

Yeah, I think that document might be onto something. The timing is a lot closer to 1T 2T 3T rather than the 1T 1.5T 2T of MFM.

you may want to look at the information Chuck sent me (futurfmt.txt) as a starting point. it may still be using the Micropolis 1055...

When I briefly had a look at them after reading, it seemed to have three bands of timing states, indicating some kind of Double-Density...

These are soft-sectored, single-sided 8" disks. I was able to borrow some RDOS-II system disks to read using a raw flux-level format...

Does anyone have a reference about the low-level floppy format of GenRad RDOS-II? It seems to be quite non-standard stuff, or just very...

Rich’s FDOS material is for the 8” FD360 (iCOM) or FD3712 (Pertec). I reached out to Rich to borrow and archive any FDOS disks he had...

That might be an interesting consideration, but looking in the manual for the iCOM microfloppy controller that was linked to, it does...

In the case, I think it would be beneficial if they had the ability to dump the EPROM on it. Being a FD1771-based design, it should be...

Good stuff! As we were surmising, it appears the FDOS files on the 8” disks are the files you need to build an FDOS 5.25” disk. Most...