Technical data

Functional Description
Overview
2-10
I/O Controller ASIC
The Model 743 uses an I/O Controller ASIC to control the input and output of the follow-
ing:
• Audio
• Speaker
• HP Parallel
• RS-232 Port A
• AUI LAN
• SCSI
• PS/2 Ports 1 and 0
The following table lists the I/O controller memory map.
Table 2-4 I/O Controller ASIC Memory Map
Low Address High Address Size Description
F000 0000 F007 FFFF 512K Main BootROM space
F008 0000 F00B DFFF 248K OEM/Secondary ROM space
F00B E000 F00B FFFF 8K X25
F00C 0000 F00F FFFF 256K EEPROM space
F010 0000 F010 0FFF 4K Interrupt Registers
F010 1000 F010 1FFF 4K Parallel port DMA Registers
F010 2000 F010 2FFF 4K Parallel Interface Registers
F010 3000 F010 3FFF 4K Parallel Port DMA Reset
F010 4000 F010 4FFF 4K Audio
F010 5000 F010 5FFF 4K RS-232
F010 6000 F010 6FFF 4K SCSI
F010 7000 F010 7FFF 4K LAN
F010 8000 F010 8FFF 4K PS2
F010 9000 F010 9FFF 4K Real Time Clock
F010 A000 F010 AFFF 4K Reserved
F010 B000 F010 BFFF 4K Clock Configuration Registers
F010 C000 F010 CFFF 4K I/O ASIC Registers
F010 D000 F010 FFFF 12K Reserved