Tandy 1000 HX - Page 34

• TANDY COMPUTER PRODUCTS
8259A INTERRUPT CONTROLLER
INTERRUPT
NMI
0
1
2
3
4
5
6
7
FUNCTION
AVAILABLE ON BUS
8253 TIMER CH 0 (REFRESH)
KEYBOARD
HARD DISK
SECONDARY COMM.
PRIMARY COMM.
VERTICAL SYNC.
FLOPPY DISK CONTROLLER
PARALLEL PORT
Figure 8. Interrupt Structure
29