[Simh] Simulating a GT40

[Lars Brinkhoff]

Mark Pizzolato wrote:
>> It's assembled from source code.  It would be great if someone with a
>> real GT40 could dump the ROM contents.
> That would be great, but we can start with what you've got.

Ok, I'll send a separate email with the lda file.

> Connecting to a host would be useful, but merely telnetting into a DL TCP 
> port will be sufficient to prove that a few bytes move in either direction.

Good point.

Some remarks:

1. I can't "set dli address=175610", but "set dli address=17775610" is
fine.  I believe the 11/05 has a 16-bit Unibus address space, so the
former would be natural.  But the latter is OK.

2. I tried setting RAM to 64K and load the boot ROM at 166000, but that
didn't work.  I have now implemented a ROM device and have the CPU
executing from there.  I'll post a pull request for review.