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 boot device called using the boot strap board was variable, and I don't recall anything beyond an RK05 based system (booting the RK) for the versions in the lab on 1-2 in the mill.
It was for the Typeset 11 team, and then the TypeSet.DecSet team/Product line. bob On Sat, Aug 10, 2019 at 2:56 PM Paul Birkel via cctech <cctech@classiccmp.org> 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 (KD11-F). There's a real lack of documentation about these > online, although the VT72 does have a print set. > > > > 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. > > > > According to the VT72 print set, it used the MRV11-VC (M9942-YC; described > in the Field Guide as a "bootstrap/diagnostic module") for its bootstrap but > is also silent regarding the boot device. In interestingly, the Field Guide > also describes a MRV11-AA (M7942-TB) as a "M7942 with VT52 emulator, VT71 > bootstrap". > > > > For async. communications the VT20 used a DL11-B (M7800 (EIA)). the VT72 a > DLV11-F (M8028). > > > > Looking in a DEC "Options and Modules" listing I see VT20 bundles including > Typeset-11 and DECset-11, and it appears that the VT20 could be configured > with two displays & serial lines in a single 11/05. > > > > So . is the boot device in these systems the remote host via the serial > line? What protocol would that have been? Something native to Typeset-11 > and DECset-11? > > > > paul >
