Dennis Boone wrote:
Can anyone help me identify the part numbers of the
cable(s) which
would be used to connect an RX50 to an RQDXn (mine's a 3) in a
BA23 case? Say an 11/53 or 11/73 type of machine?
Jerome Fine replies:
The BA23 normally arrives (i.e. has as standard
hardware) a distribution panel for the RX50 dual
floppy drive and RD5n hard drives. A 50 pin flat
cable with a female header at both ends is used to
connect the controller (RQDX3 in your case) to this
distribution panel. The distribution panel has a
40 pin connection available in approximately the
centre (although only the connection headers are
visible through holes in the bulkhead between the
distribution panel and the area which holds the
floppy and / or hard drives). The cable to be used
is a 40 pin cable with a female header at both ends
and usually about 10" in length (when used in a BA23).
For the hard drive (usually only one in a BA23 -
although 2 hard drives can be accommodated if you know
how), a standard 20 pin cable and 34 pin cable with
a female header at one end (distribution panel) and
an edge connector at the other end (hard disk drive).
In all cases, the cables are the same as used in a PC.
Sorry, I do not have the DEC cable part numbers.
Be careful! The first (only if you are using only one)
hard disk drive uses DS3. The RX50 rarely needs any
settings changed - I would not know how if asked since
I have never used more than a single (dual) RX50.
In most cases, a BA23 is used with a quad CPU board
which contains boot ROMs. This is not required, but
is much more convenient. The 11/73 requires separate
memory. The 11/53 contains on board memory, but allows
additional memory in the normal manner. Be sure to
wire wrap all memory correctly.
With an 11/73, only 3 boards are required since there
is a single DL type port (quad 11/73 of course) on the
11/73. You will need the appropriate cabinet kit. The
second board is memory and the third board is the RQDX3.
Any other questions?
Sincerely yours,
Jerome Fine
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