LC

Program VGA Registers for Graphics Modes

hard7/8

Program the DMA Controller for Memory Transfers Access PCI Configuration Space

Language

Compiler

2.0s Limit 256MB

Implementation

Implement VGA register programming in C.

Requirements:

Define VGA register port constants
Implement write_crtc(index, value)
Implement set_dac_color(index, r, g, b)
Implement put_pixel_mode13(x, y, color)
Show Mode 0x13 initialization sequence
Draw a gradient or simple pattern
Show DAC palette programming
Calculate pixel offsets for 320x200 mode

Test:

Show VGA registers written
Show pixel plotted
Show DAC color set
Show pattern drawn

Why This Matters

Mode 0x13's linear one-byte-per-pixel framebuffer at 0xA0000 is the classic first graphics mode nearly every OSDev-wiki hobby kernel implements, precisely because it needs no plane-switching logic unlike EGA/VGA's 16-color modes. Direct CRTC/DAC register access like this is also what DOS-era games (id Software's early titles among them) used before VESA and later GPU-vendor drivers replaced raw VGA programming.

Hints

0 / 3 revealed

Validation Suite

main.c

Workspace 1.0