Anonymous user
8259 PIC: Difference between revisions
further explanation
| [unchecked revision] | [unchecked revision] |
m (s/occured/occurred/) |
(further explanation) |
||
Line 130:
a2 = inb(PIC2_DATA);
outb(PIC1_COMMAND, ICW1_INIT+ICW1_ICW4); // starts the initialization sequence (in cascade mode)
io_wait();
outb(PIC2_COMMAND, ICW1_INIT+ICW1_ICW4);
io_wait();
outb(PIC1_DATA, offset1); //
io_wait();
outb(PIC2_DATA, offset2); // ICW2: Slave PIC vector offset
io_wait();
outb(PIC1_DATA, 4); //
io_wait();
outb(PIC2_DATA, 2); // ICW3: tell Slave PIC its cascade identity (0000 0010)
io_wait();
| |||