13 Oct
2011
13 Oct
'11
9:53 p.m.
On 13 Oct 2011 at 20:58, Josh Dersch wrote:
Some neat stuff, a copy of BDS-C, COBOL-80 and MBASIC
for the Altos.
I am not having much luck capturing images of the CP/M disks, however.
They appear to be single-sided, double-density. The first two tracks
are SD and have 26 sectors per track, the rest are DD and have 48
sectors/track which is where my system appears to have trouble,
ImageDisk just won't read the DD tracks. If anyone has any
suggestions, let me know.
It's your controller. Those sectors are MFM and 128 bytes long.
You *can* read these with a controller that uses the National Semi
DP8473 controller. NEC and Intel pretty much screwed up 128 byte MFM
sectors.
--Chuck