[Simh] Simulating a GT40

[Paul Koning]

> On Sep 3, 2018, at 11:52 AM, Mark Pizzolato <Mark at infocomm.com> wrote:
> 
> On Monday, September 3, 2018 at 8:37 AM, Al Kossow wrote:
>> On 9/3/18 8:35 AM, Al Kossow wrote:
>>> 
>>> 
>>> On 9/3/18 8:17 AM, Mark Pizzolato wrote:
>>> 
>>>> Was this code really present in ROM in that system?
>>> 
>>> yes, it is located on one of the hex cards in the VT-11 part of the
>>> custom 11/05 backplane in the GT-40
>> 
>> http://www.brouhaha.com/~eric/retrocomputing/dec/gt40/
>> 
>> for details
> 
> Interesting...
> 
> I'm a little confused though.  I certainly understand using the GT40 
> as a standalone system to run Lunar Lander.   That's great fun.
> 
> Meanwhile, if the GT40 could be some sort of terminal to some other 
> system, how was it connected to that other system?  Serial line via the 
> DL device?

I don't know about its use as a terminal, but apart from Lander you could run RT-11 on a GT-40.  If so, some components would know to take advantage of the display.  In particular, there was GT-40 support in TECO, including a screen mode editing macro similar to vtedit.tec.  I haven't see that one, unfortunately; it was probably pretty basic.  You could also do without it, simply issuing TECO commands while the GT40 was displaying the buffer content in real time.

	paul