[Simh] Simulating a GT40
Lars Brinkhoff
lars at nocrew.org
Mon Mar 16 03:12:02 EDT 2020
Lars Brinkhoff wrote:
> I'd like to set up SIMH to simulate a GT40 as closely as possible. To
> be precise, the GT40 that was a the MIT AI Lab.
>
> So far, I have this:
>
> set cpu 11/05
> set cpu 16k
> set dli enabled
> set dli lines=2
> set vt enabled
> set vt crt=vr14
I have been having trouble running some GT40 software with this. Turns
out one crucial detail is missing: An interrupt vector for the VT11.
Apparenty the ROM and Lunar Lander don't use the VT11 interrupt, but
some other software does. With the addition of
set vt vec=320
those programs work too. This conflicts with the DZ11 device which is
enabled by default; it's not part of the GT40 hardware so just remove it.
Now the GT40 can be used with Emacs and Spacewar.
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