Skip to content

Add MASK_EN note #629

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
wants to merge 2 commits into
base: master
Choose a base branch
from
Open

Add MASK_EN note #629

Changes from all commits
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
3edbf6b
Add MASK_EN note
dmitry-shechtman Oct 2, 2025
7f4c1a9
Fix missing container closure
dmitry-shechtman Oct 2, 2025
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
7 changes: 7 additions & 0 deletions src/SGB_Command_System.md
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -24,6 +24,13 @@ after having displayed the picture). The Cancel Mask function may be
also invoked (optionally) by completion of PAL_SET and ATTR_SET
commands.

:::tip

SGB freezes/unfreezes the Game Boy screen automatically whenever the LCD is
turned off/on.
Comment on lines +29 to +30
Copy link
Member

@ISSOtm ISSOtm Oct 4, 2025 •
edited
Loading

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Suggested change
SGB freezes/unfreezes the Game Boy screen automatically whenever the LCD is
turned off/on.
The screen retains its last frame when the "LCD" is [turned off](<#LCDC.7 — LCD enable>), though it gets blanked out after a while.

Copy link
Contributor Author

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

I think "stops updating" might confuse people, although it's technically correct.
I'm not sure what "gets blanked out after a while" means.

Copy link
Member

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

AFAIK, leaving the screen turned off for a significant period of time causes the SGB firmware to blank out the framebuffer.

Copy link
Contributor Author

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

@nitro2k01?


:::

## SGB Command $0C — ATRC_EN

Used to enable/disable Attraction mode, which is enabled by default.
Expand Down