DOS ain't dead

BIOSCOM - use a serial terminal as a text-mode display (Announce)

posted by samwdpckr, 09.09.2024, 00:03

> > I have one XT-class computer with an MDA graphics card, but I don't have
> a
> > display for it. It does have serial ports, so I wrote this program so
> that
> > I can actually use that computer for something.
> >
> > The program can be downloaded from here:
> > http://sininenankka.dy.fi/leetos/software.php
> >
> > I also recorded a video of using the computer with PuTTy as its screen:
> > https://www.youtube.com/watch?v=w9IM43iaVUE
>
> that seems to be rather slow, looking at the video, maybe it will help to
> tune how it deals with scrolling?

It detects situations where the screen has been scrolled down, but it can only do so much. If the screen has been scrolled more before the last lines have been updated, it starts updating the screen line-by-line, because it has only one double buffer in the memory. A better scrolling detection would require two double buffers. Each buffer is 4K in the standard 80x25 text mode.

The baud rate on the video is 19200, which is the maximum that VT420 can do.

Complete thread:

• BIOSCOM - use a serial terminal as a text-mode display - samwdpckr, 08.09.2024, 01:44 (Announce)
  • BIOSCOM - use a serial terminal as a text-mode display - mceric, 08.09.2024, 14:36
    • BIOSCOM - use a serial terminal as a text-mode display - samwdpckr, 09.09.2024, 00:03
  • BIOSCOM - use a serial terminal as a text-mode display - bocke, 10.11.2024, 10:13
  • BIOSCOM - use a serial terminal as a text-mode display - DosWorld, 10.11.2024, 11:32