Subject: Re: Some said they have CDOS and Cromemco disks
From: "Randy McLaughlin" <cctalk at randy482.com>
The only real issues are either differences in
different soft-sectored
controllers (Western Digital based chips have some formats that the 765
based chips can't handle but are rarely used) or the basic ability to handle
FM (as in 3740 format).
The difference between 1771 and 765 are that 765 only does IBM style
formats FM or MFM. As a result you only supply Cylinder, Head,
Record<sector>, and N a lenth encoding. The 1771 you pump every
byte required for the entier track until it times out. That difference
is significant as one was designed as a IBM format controller and the
other was more universal. However the 765 series chip does do FM and at
all data rates. Many boards for PCs limit that by not implmenting needed
peices or not supporting it in the bios. So if the 765 based controller
doesnt do any of the common formats (especially FM) blame the designer
of the board.
Allison