AlphaStation 200 NVRAM Problem
Maciej W. Rozycki
macro at linux-mips.org
Tue May 3 12:20:34 CDT 2016
On Mon, 2 May 2016, Robert Jarratt wrote:
> I decided to attempt the construction of an adapter. But it is the
> connectors which always bite me because I don't know what all the types of
> connector are. I naively assumed that an IDC 10-way (2x5) would do the
> trick, but it is too wide to go into the male connector on the board.
> What kinds of connectors exist for ribbon cables that can be used to go into
> a 2x5 connector, but which don't have a lot of space at the sides?
I think this header is intended for a crimp wire receptacle, like:
<http://uk.rs-online.com/web/p/pcb-connector-housings/8215708/>. This is
non-polarised though; getting one that is polarised and with the right key
might be a bit of a challenge. Alternatively a PCB socket like:
<http://uk.rs-online.com/web/p/pcb-sockets/7655648/> would do too; again
getting a polarised one seems tough.
I don't know which of the two solutions the original DEC SROM "dongle"
used. I can only find 3 references quoting the part number, which is/was
96-RM001-01. It provided for a standard DECconnect cable, so I think it's
actually quite likely that it was just a small daughtercard with a PCB
socket, line driver and receiver ICs (DEC documentation quotes 1488 and
1489, but with a pair of wires used for communication that looks like an
overkill to me -- a single IC like MAX232N would do IMHO; RS sell them
individually even) and their associated passive components, and then an
MMJ socket, all on the PCB. Obviously these days you probably want a DE-9
connector instead. ;)
I wonder if I shouldn't actually make something like this myself just for
fun -- to have a way to peek at my DEC 3000's internals even though it
appears healthy overall.
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