Thanks, mistake on my part ... I thought you had to change to 18 spt in the source to make it recognize 17 spt images.

Still no luck with the PC-D, but the PC-X now formats a 306-4-18-512 image nicely with Sinix 1.2 ... and even boots from the harddisk after the initial stage - with a 1024 byte/sector image it would hang afterwards.

NCR DMV- DEC Rainbow- Siemens PCD- ITT 3030-Oly People- Acorn A5000- Olivetti M20