For reference purposes, memory range 00000000 to 000001ff contains read-only information about the CPU some program is running on. This information may be used for UI context or to enable/disable specific features depending on the CPU supported feature set.

The size of the specification structure is not static as it depends on the size of the encoded information.

Reference

Size	ID	Name	Description
1 byte	name_length	Name Length	Length of the CPU name in characters
Variable	name	Name	The name of the CPU as an ASCII string
2 bytes	id	ID	A unique model identifier
1 byte	microarchitecture_length	Microarchitecture Length	Length of the microarchitecture name in characters
Variable	microarchitecture	Microarchitecture	The name of the microarchitecture the CPU is based on
1 byte	microarchitecture_name_length	Microarchitecture Name Length	Length of the microarchitecture codename in characters
Variable	microarchitecture_name	Microarchitecture Name	The codename of the microarchitecture the CPU is based on
1 byte	data_width	Data Width	The number of bytes the CPU can process at once
1 byte	address_width	Address Width	The number of bytes the CPU can address
2 bytes (VXAv2)4 bytes (VXAv2+)	available_ram	System RAM	The amount of RAM installed on the system
2 bytes4 bytes (VXAv2+)	microcode	Microcode Version	A unique version number for the CPU microcode
4 bytes (VXAv2+)	last_byte	Last Virtual Memory Byte	The address of the end of the virtual memory area