Comment by unleaded

5 days ago

It's interesting that none of the programs commonly known as "terminal emulators" actually emulate a terminal.. we can do that now though. https://zork.net/~st/jottings/Real-VT102-emulation-with-MAME...

I would avoid doing the PTY thing and instead do this (works on WSL if MAME is the windows version):

    $ sudo socat TCP-LISTEN:1234,reuseaddr,fork EXEC:"/sbin/agetty -L - 9600 vt102",pty,setsid,ctty,stderr
    $ mame -nomouse vt102 -rs232 null_modem -bitb socket.localhost:1234

You can do the same thing with a vt220.

I've had an idea to try to write a sort of high-level-ish VT220 emulator that pokes and patches the ROMs and the system to let you control it with the mouse, paste and stuff, lets you just doubleclick it to get a terminal, etc... I forgot about that until seeing this. Nobody would use it for more than 5 minutes but it would be funny.

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blueflow  4 days ago

They do emulate a terminal, not just the kind of emulation you have in mind. "Wine is not an emulator" again.

anthk  4 days ago

Forget MAME; I'd love a forked project for this minus the shaders for old machines. Where you just get the terminal emulation with a good TTF font and that's it. There are similar projects for the Altair 8800 where they scrapped their code from SIMH (now I prefer simh-classic) to just emulate a CP/M 2.2 Altair machine and that's it, because these people don't need to emulate PDP10's with ITS, old BSD's, current VAX NetBSD releases or the rest of the DEC machines...

LukeShu  5 days ago

> You can do the same thing with a vt220.

Can you? The last I looked at it (a year or two ago), the vt220 in MAME was just the beginning skeleton of an implementation, and it doesn't seem to have been touched much since then. A shame, because AFAIK no "terminal emulator" implements vt220-style sixels (which are different than than the widely-implemented vt4xx-style sixels).

dgl  5 days ago

If MAME could support the VT525 (nearly the last terminal DEC made and unlike the previous DEC models it supports ANSI color) people might use it a bit more. It would be very useful for compatibility testing as there aren't many people with a real VT525! Last I looked someone had dumped the ROMs but there wasn't any support code.

  • p_l  4 days ago

    VT5xx was the budget line with limited functionality, that's why only 525 among them supports ANSI color. The only fancy stuff was multisession (TD/SMP if you have all bits to support it) and "desktop accessories" like clock and calculator.

    The really interesting ones are VT340 variants with ReGIS and full SIXEL graphics

    • dgl  3 days ago

      The VT3xx ones that were color did not support ANSI SGR to set them. I don't think VT5xx was a budget line, it has more escape sequences than the previous ones (including interesting ones like changing cursor shape, which modern terminals implement too). It's more that they never made a graphical version of the VT5xx (this was the early 90s, whether physical VTs made sense anymore is debatable, but terminal graphics likely didn't).

      VT340 is definitely interesting and if someone were to emulate one that would also be great! (there's been some good research, e.g.: https://github.com/hackerb9/vt340test, which you might be surprised to learn has been used to make Windows Terminal one of the more conformant terminals...)

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