you may already know about these but here are a few 8051 Simulators:
https://www.electronicshub.org/8051-simulators/
And thoughts on using MAME to emulate terminals:
https://zork.net/~st/jottings/Real-VT102-emulation-with-MAME.html
Good luck. I have a fully functional VT-330+ and a fully functional
VT-220 if i can help at all.
On 2/5/2024 10:23 AM, Paul Flo Williams via cctalk wrote:
On Sun, 04 Feb 2024 16:26:57 -0700
Richard via cctalk <cctalk@classiccmp.org> wrote:
In article <a5e5be0a-362d-4c0e-a3ec-ca503039f...@fritzm.org> you
write:
I'm about to dive in to commenting the disassembly listings, but
figured I'd ping here to see if anybody might have done this already
in case I wouldn't have to start from scratch?
Give IDA Pro or Ghidra a crack at it to help you make sense of the raw
disassembly.
I made pretty good progress on VT100 ROMs before Paul Williams put up
a completely reverse engineered commented listing.
Well, in case it helps, I'll explicitly disclaim any intention of
disassembling the VT220 :-)
After the VT100, I did make a start on the VT102/131 combination but it
seemed too samey to hold my interest.
More than 20 years ago, I started on the VT320, as my personal
favourite, but I didn't understand how to tackle emulation at the
time, the 8051 emulator I wrote had flaws, and I spent a long time on
getting the emulated video timing correct enough to even pass self
test! If only the VT320 had had a technical reference as comprehensive
as that published for the VT100. I will return to it at some point,
probably using some else's 8051 core, as Peter Sichel (last head of
DEC's terminals group) bet me that I wouldn't be able to do it.
At the moment, I'm tackling another full commentary, but it may well
have an even smaller audience than that for the VT100; I'm 83% through
gutting the arcade game Star Force. I've even fixed two æsthetic bugs
in the game, 40 years too late for anyone to care. At least this is Z80
assembler, and tinkering with that has always made me *very* happy.
Paul.
