AlphaStation 200 NVRAM Problem
robert.jarratt at ntlworld.com
Tue May 3 16:18:03 CDT 2016
> On 03 May 2016 at 18:20 "Maciej W. Rozycki" <macro at linux-mips.org> wrote:
> 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.
The crimp wire one looks like it would work, thanks for the suggestion!
> 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 have a MAX232CPE now, just need the connectors and one more 1uF capacitor and
I should have all I need.
> 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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