Skip to content
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

Include documentation about the upcoming changes to the behavior of t… #102

Merged
merged 1 commit into from
Nov 20, 2023
Merged

Include documentation about the upcoming changes to the behavior of t… #102

Changes from all commits
Commits
Show all changes
1 commit
Select commit
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
4 changes: 2 additions & 2 deletions VERA Programmer's Reference.md
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -678,6 +678,7 @@ Each pixel in the tile data gives a color index of either 0-3 (2bpp), 0-15 (4bpp

* Color index 0 (transparent) and 16-255 are unmodified.
* Color index 1-15 is modified by adding 16 x palette offset.
* T256C causes bit 7 of the color index to become 1.

Note that 2bpp mode packs 4 pixels per byte and 4bpp mode packs 2 pixels per byte. For packed pixels, bit 7 refers to the leftmost pixel and bit 0 refers to the rightmost pixel.

Expand All @@ -687,8 +688,7 @@ Note that 2bpp mode packs 4 pixels per byte and 4bpp mode packs 2 pixels per byt

**TILEW** specifies the bitmap width. TILEW=0 results in 320 pixels width and TILEW=1 results in 640 pixels width.

The palette offset (in **'H-Scroll (11:8)'**) modifies the color indexes of the bitmap in the same way as in the tile modes.

The palette offset (in **'H-Scroll (11:8)'**), as well as T256C in non-1bpp mode modifies the color indexes of the bitmap in the same way as in the tile modes.

## SPI controller

Expand Down