> I didn't fully disassamble the program
I have now done so; the -YK is _exactly_ the same as the -YA (the later ones,
which are minorly different from what's in the manual), except that the HSR
address (177550) has been replaced as the primary device address by that of
DL11 #1, in the second
> On Aug 11, 2019, at 7:45 PM, Eric Smith via cctalk
> wrote:
>
> On Sun, Aug 11, 2019 at 1:18 AM Bob Smith via cctalk
> wrote:
>
>> The VT20 design team was, iirc, John Kirk for the video, and me for
>> the Unibus interface in the first version. The one with the slick
>> one shown here,
I worked on a lot of Xerox 820s, apparently that did the same job!
On 11/08/2019 19:45, Eric Smith via cctalk wrote:
On Sun, Aug 11, 2019 at 1:18 AM Bob Smith via cctalk
wrote:
The VT20 design team was, iirc, John Kirk for the video, and me for
the Unibus interface in the first version. The
On Sun, Aug 11, 2019 at 1:18 AM Bob Smith via cctalk
wrote:
> The VT20 design team was, iirc, John Kirk for the video, and me for
> the Unibus interface in the first version. The one with the slick
> one shown here,
> http://bitsavers.org/pdf/dec/terminal/vt20/vt20_2.jpg
>
That looks pretty
> From: Paul Birkel
> Apparently the VT20 used the M792-YK as its bootstrap; the Field Guide
> is silent regarding the boot device and M792 documentation stops
> earlier in the series of variants.
An M792-YK recently sold on eBait; I didn't get it, but I did manage to get
the
>-Original Message-
>From: Jay Jaeger [mailto:cu...@charter.net]
>Sent: Saturday, August 10, 2019 11:02 PM
>To: Paul Birkel; General Discussion: On-Topic Posts
>Subject: Re: DEC VT20 boot device
>
>On 8/10/2019 1:56 PM, Paul Birkel via cctech wrote:
>> The D
Paul Birkel wrote:
>>I wonder if, maybe, it used the same protocol as the GT40, which also
>>had a boot-over-serial line capability.
>
> Section 5.1.1 Bootstrap Loader describes the packed-and-serialized
> 6-bit "byte" stream
I have the GT40 boot ROM assembled on a PDP-10 host and used for
On 8/10/2019 1:56 PM, Paul Birkel via cctech wrote:
> The DEC VT20 terminal apparently included a PDP-11/05 with a direct mapped
> character display and was intended for text editing and typesetting. It
> seems to have been followed by the VT21, and then VT71/VT72, all three based
> on an LSI-11
The DEC VT20 terminal apparently included a PDP-11/05 with a direct mapped
character display and was intended for text editing and typesetting. It
seems to have been followed by the VT21, and then VT71/VT72, all three based
on an LSI-11 (KD11-F). There's a real lack of documentation about these
> On Aug 10, 2019, at 2:56 PM, Paul Birkel via cctech
> wrote:
>
> The DEC VT20 terminal apparently included a PDP-11/05 with a direct mapped
> character display and was intended for text editing and typesetting. It
> seems to have been followed by the VT21, and then VT71/VT72, all three
The VT20 design team was, iirc, John Kirk for the video, and me for
the Unibus interface in the first version. The one with the slick
one shown here,
http://bitsavers.org/pdf/dec/terminal/vt20/vt20_2.jpg
The /05 based package was after my time, I don't remember much about
how it was deployed.
The
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