> 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 o
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 nice
> 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 sell
>-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 booting
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
o
> 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 bas
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 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 b
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