DEC RK11-C Disk Controller - on ebay...or is it?

Jon Elson elson at
Tue Feb 9 09:50:08 CST 2021

On 02/08/2021 11:37 PM, Ethan Dicks via cctalk wrote:
> On Mon, Feb 8, 2021 at 10:22 PM Fritz Mueller via cctalk
> <cctalk at> wrote:
>> On nice thing about this controller is that it supports "Read/Write All" mode, which
>> lets you read or write the raw bitstream including block headers.  This can be useful
>> for disk recovery if you have a corrupted block header, or for reading/writing "foreign"
>> disks (within limits).  This is controlled by bit 9 in the CSR, which is unimplemented on
>> the later controllers.
> Interesting.  Did not know that.  I don't know that I've ever had a
> corrupt disk that I needed to read, but it's good to know that feature
> exists.
> -ethan
The write all function is likely how you format a blank pack.


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