Xycom AHIP-370, Manual

Page: 16 / 65

AHIP-370 Manual
16
IN = Microtouch Controller, any
mode
J19 J11 Connecting the two pins will
reset the CPU. Factory use only for emulators.
N/A J12 Forces front-side bus to run at
66MHz. Factory use only.
All AHIP-370 jumpers are factory set in the "A" position.
System Interrupts
The following table describes the interrupts used on the AHIP-370.
Table 2- 3. System Interrupts
Interrupt Function
IRQ0 System Timer
IRQ1 Keyboard
IRQ2 Cascade
IRQ3 Serial Port*
IRQ4 Serial Port*
IRQ5 Parallel Port*
IRQ6 Floppy Controller
IRQ7 Parallel Port*
IRQ8 Real Time Clock
IRQ9 Unused
IRQ10 Serial Port*
IRQ11 Serial Port*
IRQ12 Mouse Port
IRQ13 Math Co
IRQ14 Fixed Disk
IRQ15 Unused
* BIOS setup controlled
The BIOS setup menu controls the interrupts for the serial and the parallel port.
The two Serial ports on the AHIP-370 board can be mapped to any two of the fol-
lowing interrupts: 3, 4, 10, & 11 (defaults are interrupts 3 and 4). One parallel port
can be mapped to IRQ5 or IRQ7. The BIOS setup menu is used to control the loca-
tion and interrupts for the serial and parallel ports.
Note
The BIOS controls the mapping of the AGP interrupts to AT-bus inter-
rupts. This means if a AGP device is plugged into a slot and needs an
interrupt, one of the AT-bus interrupts must be mapped to the AGP inter-
rupt.