212px ?

By PingPong

Prophet (3452)

PingPong's picture

15-01-2019, 21:13

Just wondering about msx2 vert screen resolution.
msx1 had a common 192px also used on other system. another common was 200px.
but 212px? where does this strange number come from ? someone know a tech or non tech reason that got this strange resolution? or may guess something?

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By Piter Punk

Master (203)

Piter Punk's picture

15-01-2019, 21:22

Videotex.

204px is the vertical resolution for CAPTAIN videotex systems. The additional 8px are for a status line.

By mars2000you

Enlighted (5513)

mars2000you's picture

15-01-2019, 21:50

And the first appearance of the Videotex vertical resolution on MSX is with the Sanyo MPC-X Graphic Expander Unit: https://www.msx.org/wiki/Sanyo_MPC-X.

By Manel46

Champion (436)

Manel46's picture

16-01-2019, 13:25

In MSX2, we have two possibilities. Using R # 9, which has a copy in # FFE8. If bit 7 is at 1 we have 212 vertical points, and if it is at 0 it will be 192 vertical points.
In the case of 212 vertical points, it is clear that using 16x16 tiles, there are 4 free lines below. You have an example of use of these 4 lines in Mr. Balloon. It is the immunity indicator, which is activated with the star.
http://msxbanzai.tni.nl/compo/2014/entries.html