3 May
2016
3 May
'16
2:18 p.m.
On 03 May 2016 at 18:20 "Maciej W. Rozycki" <macro at linux-mips.org>
wrote:
On Mon, 2 May 2016, Robert Jarratt wrote:
The crimp wire one looks like it would work, thanks for the suggestion!
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 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.
Maciej