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Carl Lowenstein wrote:
> On 2/17/07, todd <markleyt@compusleuth.com> wrote:
> 
>> bart sikkes wrote:
>> >
>> > i got a VAXstation 4000 VLC, a VAXstation 4000 60 and a MicroVax
>> > 3100-30. for terminals i have a Texas Instruments Model 928 VDT and a
>> > Wyse WY-50. in my mind i should be able to just hook up a console to
>> > the correct port on the vax and i should get output. but is it indeed
>> > that simple? could in general a TI terminal be used or do i need vax
>> > terminal or such?
>> >
>> > i have a cable with two phone like connectors, i believe these are
>> > used in the DEC423 ports? all the vaxes have one or more of the port
>> > these connectors fit into and the TI terminal has it also. making this
>> > connection seems like the logical thing to do, but is it the correct
>> > one?
> 
> 
> Is this like a phone connector but with the locating key off-center?
> If so, it is a DECconnect special.  You can learn a lot by googling
> for DECconnect.

Look for "MMJ".

>> > with an uVax II i once worked on i used a serial DB25 female - female
>> > DB9 cable, but i think i need a serial DB25 female - DB25 female cable
>> > for these vaxes and terminals. can any basic female-female DB25 cable
>> > be used for this and would it work better or differently from the
>> > phone connectors like cable?
>> >
>> > currently when i hook up any of the three vaxes to the TI terminal i
>> > basicly get either a bunch of non logical characters or nothing. with
>> > the 4000 VLC it keeps repeating a similar block of characters on
>> > screen. with the 4000 60 i see nothing on the screen, but that one has
>> > a bunch of such DEC423 ports, so perhaps i have the wrong one. the
>> > 3100 shows a couple of weird characters after boot and remains at
>> > that.
>> >
>> > from some googling i found that you can set different things on a
>> > terminal. the TI terminal has a large menu with many options and i
>> > tried to set them to what i felt was correct, but im unsure if this is
>> > correct or if these settings can cause the weird output.
>> >
>> > the vax is connected on port 1 and these are the settings for port 1
>> > on the TI terminal
>> > communication: half duplex
> 
> Almost certainly you want full duplex to communicate with the VAX.

Yes.

>> > data length: 8 bits
>> > parity: none
>> > stop bits: 1
>> > xmit baud: 9600
>> > recv baud: =Xmit
>> > xmit pace: Xon/Xoff
>> > recv pace: DTR/Xon/Xoff
> 
> Almost certainly you do not want DTR pacing.

Right. DEC never used hardware handshaking for flow control. They always 
used XON/XOFF.

>> > limited transmit: off
>> > dsri: no
>> > cts: ignore
>> > cd: ignore
>> > break duration: 170 ms
>> > disconntect delay: 2 sec
>> > aux printer type: national
> 
> Hope this helps some.  Note also that early MicroVAXes had 9-pin
> connectors for serial console that look like PC 9-pin connectors but
> do not have the signals going to the same pins.  This is merely
> because the DEC computers were built several years before PCs took
> over the popular mind.

Right. And the DEC pinout for the DE-9 actually makes more sense if you 
know RS-232.

	Johnny

-- 
Johnny Billquist                  || "I'm on a bus
                                   ||  on a psychedelic trip
email: bqt@softjar.se             ||  Reading murder books
pdp is alive!                     ||  tryin' to stay hip" - B. Idol

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