ImageDisk 1.08 posted

[Chuck Guzis]

On 11/21/2005 at 7:20 PM ard at p850ug1.demon.co.uk wrote:

>I do have the HP150 technical reference manual and the 150-II update, but 
>from what I rmemeber it says remarkably little about the physical disk 
>format. I wrote linus programs to read the 9114 disks and there was 
>nothing of use in said manual.
>
>>From what I recall, the single and double sided formats are 
>somewhat different, though.

A long time ago, I wrote a DOS driver for the HP-150 series 1 and 2.
Here's what I have:

HP-150 series 1:

	16 256-byte sectors per side, 1 side, 66 cylinders, interleaved 4:1, first
sector is 1

HP-150 series 2:

	9 512-byte sectors per side, 2 sides, 77 cylinders, interleaved 2:1, first
sector is 1

Does that help any?    Note that these numbers reflect the diskette are
used by DOS, not the absolute number of tracks on each disk.  Like Allison
said,  some are intended as spares.

Chuck