HelenOS sources

EGA_DATA_REG      468 kernel/genarch/src/drivers/ega/ega.c 		uint8_t stat = pio_read_8(instance->base + EGA_DATA_REG);
EGA_DATA_REG      470 kernel/genarch/src/drivers/ega/ega.c 		pio_write_8(instance->base + EGA_DATA_REG, stat & (~(1 << 5)));
EGA_DATA_REG      478 kernel/genarch/src/drivers/ega/ega.c 		pio_write_8(instance->base + EGA_DATA_REG,
EGA_DATA_REG      481 kernel/genarch/src/drivers/ega/ega.c 		pio_write_8(instance->base + EGA_DATA_REG,
EGA_DATA_REG      490 kernel/genarch/src/drivers/ega/ega.c 		uint8_t hi = pio_read_8(instance->base + EGA_DATA_REG);
EGA_DATA_REG      492 kernel/genarch/src/drivers/ega/ega.c 		uint8_t lo = pio_read_8(instance->base + EGA_DATA_REG);
HelenOS homepage, sources at GitHub