8 Feb
2021
8 Feb
'21
7:21 p.m.
Yup, RK11-C, and it seems complete (modulo drive cables and terminators.) I have one
debugged and running in my '11/45, so I know it well.
On Feb 8, 2021, at 3:16 PM, Ethan Dicks via cctalk
<cctalk at classiccmp.org> wrote:
The ribbon cables are a bit out of place... perhaps they were just
stuffed into empty slots to keep them from being damaged.
The cables are actually in the correct slots -- they connect A30 and B30 to the
pass-through connectors to support plugging in a pair of KM11s from the outside of the
rack for debug.
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.
--FritzM.