[rescue] console show output, does not take input -> fixed

Walter Belgers walter+rescue at belgers.com
Mon Mar 29 04:20:17 CST 2004

Carl R. Friend wrote:
> > I _do_ get the CPU board to take some input when I wiggle the connector.
> > Also, I do get feedback that DTR goes high because when I insert the
> > cable, a prompt is sent.
>    Check for (1) a bad console connector on the machine itself and
> (2) for cold/broken solder joints on the socket.

I've got it fixed. Just so this gets into the archives..

The connector was wired as follows:

   TXD ------------- 2
   RXD ------------- 3
   RTS/CTS --------- 4
              \----- 5
   DTR ------------- 6
   GND ------------- 7
   DCD ------------- 8
   DSR ------------- 20

I was using a cross connector that shorted 4+5 and 6+8+20 and crossed
2 and 3. Result: the terminal displayed the output, but the system would
not accept input.

I have connected RTS/CTS with DTR, DCD and DSR now and this seems to
work (the terminal is set to ignore all handshaking).

   TXD ------------- 2
   RXD ------------- 3
   GND ------------- 7
   RTS/CTS ----\
   DTR --------|
   DCD --------|
   DSR --------/

The console now works. Next step: booting (SASI controller sees the Xebec
card with the LARK and the xebex card with the hard disk and floppy, but
they won't boot, harddrive LED keeps burning).

Walter Belgers         "Si hoc signum legere potes, operis boni in rebus
walter at belgers.com       Latinis alacribus et fructuosis potiri potes!" 

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