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Nah, it's just the video retrace.

See here another video:

https://www.youtube.com/watch?v=iGM-lz23oaY

BTW that's the same machine ... I got it from the guy with the YT video.

I imagined. This machine should be pretty rare if there is only one youtube video about it

I got the chance to document and dump 3 (1/2) other BOSS machines this week. Here are a few infos while I'm waiting for the final OK to publish the stuff.
We're getting dumps from the main and char ROMs from two Boss B Z80 and one Boss B 8085 as well as matching boot disks for these and the Boss C / D line.
The Z80 dumps are nothing new, they're completely identical to the ones in my Boss D Z80.

The disk formats are somewhat odd:

Boss A: Single sided, double density, 32 tracks, 16 sectors/track, 256 bytes/sector (Prologue), 128K
Boss B: Double sided, double density, 32 tracks, 16 sectors/track, 256 bytes/sector (Prologue), on a CP/M disk some tracks are formatted with 9 sectors/track and 512 bytes/sector, 256K
Boss C and D: Double sided, quad density, 76 tracks, 16 sectors/track, 256 bytes/sector (Prologue), CP/M see above, 608K

B disks exist that have 35 or 40 tracks, C/D disks exist that have up to 80 tracks, possibly residue from an earlier use of the disks.

There will be some (none too technical) documentation as well that suggests that all models existed with either CPU.

Video modes are 80x28 characters or 96x320 pixels on a p37 phosphor monitor. or 64x20 characters / 64x256 pixels in eight colours for foreground and background each.

This required the am9519 and a change to the 8257. Unfortunately, that change upsets the pc8001 which also uses the upd3301.

@crazyc: impressive job there! Now we just need those boot disks from rfka.

Thanks, @crazyc! I can probably post the stuff tomorrow.

Prologue disks should boot by just pressing CR, other disks like CP/M need an address specified. You need to type a capital B which gives you "B:" and you add the drive and a number seperated by a comma (I think it's some sort of sector offset). I've seen "B:0,1", "B:0,40", "B:0,80" and "B:0,100". IIRC "B:0,80" is standard for CP/M disks.
If you want to boot from drive B: (on a Boss A, B or C) you have to specify drive 1 instead of 0.

The archive with the disks, photos and ROMs is on the FTP now.

Correction to the boot commands: From what I learned on the phone today:

For an installation floppy of Prologue for the "D" you need to type "B:0,100"

Other Prologue floppies start with "B:0,80", reading the OS from sector 0 on track 8
CP/M on a Z80 machine is started by (CR), on an 8085 (of which we have no example) with B:0,1

We'll see

The guy who kindly offered to let me read in his stuff goes as "Aquarius" on the German VzEkC forum but might chime in here as well soon.
At least one of his Boss B Z80 is operational, so he can give valuable insight into the machine.

The keyboard needs proper emulation next.

Incredible job. @crazyc: a short writeup of how you did reverse engineer this machine would be great, considering there was no documentation or schematics.