On Sun, 8 Apr 2018, Bill Gunshannon via cctalk wrote:
I have no idea of the format. I got the images and rawrite.exe and told the computer to make them. They were unusable when I used a USB External floppy but worked fine when I used a real internal floppy. I need to get the systems running before I start playing with reading and writing weird formats. But that is coming. As a side note, I did get the system to boot and run from my floppy emulator with a USB stick. Have to boot twice. First time you get the unrecognized format error second time boots fine. Interesting. Good to know for when I am testing on other systems as well. Small steps, but advancing, just the same. bill
I seem to recall using a USB floppy drive to make P112 disks, but I also did it using a Linux machine with the dd command. The rawrite.exe program is very old and I suspect it and modern Windows systems don't see eye-to-eye anymore.
The format is described in the cpmtools diskdefs file. Below are the entries that seem most relevant to the P112.
diskdef p112 seclen 512 tracks 160 sectrk 18 blocksize 2048 maxdir 256 skew 1 boottrk 2 os 3 end diskdef p112-old seclen 512 tracks 160 sectrk 18 blocksize 2048 maxdir 128 skew 1 boottrk 1 os 3 end diskdef gide-cfa seclen 512 tracks 1000 sectrk 16 blocksize 4096 maxdir 1024 skew 0 boottrk 2 os 3 end diskdef gide-cfb seclen 512 tracks 1000 sectrk 16 blocksize 4096 maxdir 1024 skew 0 boottrk 0 # Start of second partition offset 1000trk os 3 end -- David Griffith d...@661.org A: Because it fouls the order in which people normally read text. Q: Why is top-posting such a bad thing? A: Top-posting. Q: What is the most annoying thing in e-mail?
