1-10 Technical Information
SIMMs install directly on the system board. Different size SIMMs may be intermixed.
Each SIMM is inserted into a socket or bank. The system board's two SIMM sockets are
assigned as banks 0 and 2. The standard 8 MB of memory is installed in bank 0. The
PowerMate V4100 multimedia system has one 16 MB SIMM installed in bank 0.
SIMMs must match the tin metal plating used on the system board SIMM sockets. When
adding SIMMs, use tin-plated SIMMs. See Section 3, Options, for installation instructions
and SIMM memory configurations.
Interrupt Controller
The interrupt controller operates as an interrupt manager for the AT system environment.
The controller accepts requests from peripherals, issues interrupt requests to the processor,
resolves interrupt priorities, and provides vectors for the processor to determine which in-
terrupt routine to execute. The interrupt controller has priority assignment modes that can
be reconfigured at any time during system operations.
The interrupt levels are described in Table Section 1-7. See Section 2, Setup and Configu-
ration, for information on changing the interrupts using Setup and jumpers.
Table Section 1-7 Interrupt Level Assignments
Interrupt Priority
Interrupt Device
IRQ00
Counter/timer
IRQ01
Keyboard
IRQ02
Cascade (INT output from slave)
IRQ03
COM2*
IRQ04
COM1*
IRQ05
Parallel port 1
IRQ06
Diskette drive controller*
IRQ07
Sound board or Network Interface Card (NIC)
IRQ08
Real-time clock
IRQ09
MIDI port
IRQ10
Available
IRQ11
Available
IRQ12
PS/2 mouse*
IRQ13
Coprocessor
IRQ14
Primary IDE (fast)
IRQ15
Secondary IDE (standard)
*Industry standard locations
