9 Nov
2015
9 Nov
'15
2:05 p.m.
From: Henk Gooijen
As far as my limited PDP-11 knowledge goes, none of
them used
handshake.
I'm pretty sure this is true of all the ones that had a hardwired serial
console - it's definitely true of the 11/23 and J11 chip ones (/73, etc), and
probably the 11/03's too (although it's been 30+ years since I used one of
those, so don't hold me to that :-).
So, Rxd, TxD and GND is all you need to connect.
Errq, many of them _require_ a loop-back between a pair of pins on the
Berg/DuPont connector to operate - this is true of the DL11 (M7800 - UNIBUS),
DLV11 (M7940 - QBUS), DLV11-J (M8043) and 11/23+, for instance), and probably
the 11/83-84 too. So just connecting up R, X, and Gnd alone won't do it.
Also, common (?) is *no* parity.
That, and number of bits, I have no idea about - we always changed things to
our local standard (8 bits, no parity, 2 stop bits, IIRC) straight away. Best
to check the hardware, and see what it's set to, and either set it to what
you're using, or change what you're plugging into it to match.
Noel
9 Nov
9 Nov
2:19 p.m.
On 2015-11-09 23:05, Noel Chiappa wrote:
Good point. The DL(V)11 is a general serial interface. If it's like the
KL-8 cousin, it can use both TTL, EIA and 20mA. Converters for EIA and
20mA is on the board, and you route the TTL signals through one or the
other converter, and then use the other end of those converters for
connecting to the external device. So, different cables/BERG connectors,
gave you different interfaces. Of course, you can reroute the cabling in
the BERG connector yourself as well...
Agree. But in general I would concur with Henk on this. Most everything
in DEC used to be 8N1, except for really old stuff, when they were fond
of mark parity.
Johnny
--
Johnny Billquist || "I'm on a bus
|| on a psychedelic trip
email: bqt at softjar.se || Reading murder books
pdp is alive! || tryin' to stay hip" - B. Idol
From: Henk
Gooijen
As far as my limited PDP-11 knowledge goes, none
of them used
handshake.
I'm pretty sure this is true of all the ones that had a hardwired serial
console - it's definitely true of the 11/23 and J11 chip ones (/73, etc), and
probably the 11/03's too (although it's been 30+ years since I used one of
those, so don't hold me to that :-).
So, Rxd, TxD and GND is all you need to connect.
Errq, many of them _require_ a loop-back between a pair of pins on the
Berg/DuPont connector to operate - this is true of the DL11 (M7800 - UNIBUS),
DLV11 (M7940 - QBUS), DLV11-J (M8043) and 11/23+, for instance), and probably
the 11/83-84 too. So just connecting up R, X, and Gnd alone won't do it. Also, common
(?) is *no* parity.
That, and number of bits, I have no idea about - we always changed things to
our local standard (8 bits, no parity, 2 stop bits, IIRC) straight away. Best
to check the hardware, and see what it's set to, and either set it to what
you're using, or change what you're plugging into it to match.
3331
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