Alpha is a 64-bit reduced instruction set computer (RISC) instruction set architecture (ISA) developed by Digital Equipment Corporation (DEC). Alpha was designed to replace 32-bit VAX complex instruction set computers (CISC) and to be a highly competitive RISC processor for Unix workstations and similar markets.
DEC AXP 21064 die photo
DEC AXP 21064 package
DEC AXP 21064 bare die mounted on business card with some statistics
Compaq 21264C
In computer architecture, 64-bit integers, memory addresses, or other data units are those that are 64 bits wide. Also, 64-bit central processing units (CPU) and arithmetic logic units (ALU) are those that are based on processor registers, address buses, or data buses of that size. A computer that uses such a processor is a 64-bit computer.
Hex dump of the section table in a 64-bit Portable Executable File. A 64-bit word can be expressed as a sequence of 16 hexadecimal digits.