8 Feb
2021
8 Feb
'21
9:37 p.m.
On Mon, Feb 8, 2021 at 10:22 PM Fritz Mueller via cctalk
<cctalk at classiccmp.org> wrote:
Ah... handy. I don't recall if mine has those or not. I do have a
replica KM-11 set that I need to construct. It will definitely come
in handy.
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.
I've had one for years but I haven't tried working on it yet.
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.
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