Flash Rom Address Map; Isa I/O Address Map - AlphaPC 164LX User Manual

ISA I/O Address Map

6.2.1 Flash ROM Address Map

The address range for the flash ROM is FFF8.0000–FFFF.FFFF. Flash space of
1MB is obtained by double mapping this 512KB space. FLASH_ADR19 register at
I/O location 800 provides this function. Writing a 0 to this location enables the
16
lower 512KB of flash. Writing a 1 to this location enables the upper 512KB of flash.
Interrupts and ISA Bus Addresses
6–3