I guess it would have been nice in early 80s, when a common setup was CGA with a composite monitor - or even a TV set! - where 80-column text wasn't legible enough.
May also be useful for 40-column palmtops, like Atari Portfolio.

Can it work under DOS 1.x, perhaps?

Thanks for the comment! Yeah this is about as simple as an IDE with a full screen text editor can get. It was originally written for battery-operated/embedded systems using the Intel 80C196 microcontroller and a 40 column LCD display where remote instruments are programmed "in the field."

Dos 1.x compatible? I don't think so. I'm calling interrupts 16h / AH = 0 and AH = 1, int 10h /AH = 1, 2 and 3, int 29h, int 14h / AH = 0, 1, 3 and E3h, int 21h / AH = 3Ch, 3Dh, 3Eh, 3Fh, 40h, 41h and 56h. Most of these calls only work in 2.0+. I should've mentioned that.

Grzyb wrote on Today, 02:23:

... Can it work under DOS 1.x, perhaps?

If you want to try it, have a look at DOSBOOT.ZIP (in downloads on my site)

It has .IMGs for about 25 different versions of DOS going back to 0.90 pre-release, 1.00 and up

You can boot them in most emulators (I use PcEM, VMware and DosBox)
stuff can be tricky to run in 1.x - 2.x up runs a lot of stuff!

Grzyb wrote on Today, 02:23:

I guess it would have been nice in early 80s, when a common setup was CGA with a composite monitor - or even a TV set! - where 80-column text wasn't legible enough.
May also be useful for 40-column palmtops, like Atari Portfolio.

Can it work under DOS 1.x, perhaps?

Hi there! 😃👋

On a small green monitor ("data display"), for example, CGA over composite was crystal clear; even in 80 column mode.
I've used that setup most of time here. It's basically RGB level, just in mono.

Also, I think, many European PCs in PAL land didn't have the NTSC colour-burst circuit installed.
So their AV out for on-board CGA was monochrome all the time.

If the colour monitor was good (modern SCART TV or Commodore 1084),
then the 80 column mode worked as good as on a real monochrome monitor.

IBM PCs with IBM CGAs or higher-end CGA clone cards excluded, of course.
They were sold internationally and had NTSC outburst circuit left intact.

Edit: Never mind, missed the point. Sorry, I was a bit too chatty again! 😅

Awesome!