Amiga - a 16bit or 32bit machine?

[Hammer]

Why is the x86 a hybrid? isn't it 32bit as well?

edit: ok I understand (read wiki article).

From wiki

All internal registers as well as internal and external data buses were 16 bits wide, firmly establishing the "16-bit microprocessor" identity of the 8086. A 20-bit external address bus gave an 1 MB (segmented) physical address space (220 = 1,048,576). The data bus was multiplexed with the address bus in order to fit a standard 40-pin dual in-line package. 16-bit I/O addresses meant 64 KB of separate I/O space (216 = 65,536). The maximum linear address space were limited to 64 KB, simply because internal registers were only 16 bits wide. Programming over 64 KB boundaries involved adjusting segment registers (see below) and were therefore fairly awkward (and remained so until the 80386).

Latest X86 supports X86-64 (aka X64, AMD64, Intel64, EMT64) ISA i.e. X86's 64bit ISA.

[Hammer]

Yes, of course it was forward-planning, didn't mean to imply it wasn't. Just saying it wasn't exactly fully designed as 32-bit either. If it were, the ALU would have been able to handle 32-bits natively, as the later models did, without resorting to microcode hacks. No doubt the designers intended it to be forward-compatible with 32-bit software, which was a good thought indeed, but the processor was "optimized" (if you will) for 16-bit operations, and 32-bit operations induced cycle penalties in the best case, or wasn't even supported at all in the worst cast (multiply). The nomenclature of the operand sizes supports this idea too as a "word" is 16-bit and a "long-word" is 32-bit. The 16/32-bit name seems fitting enough to me...

Pentium IV(Northwood)'s ALUs are 16bits wide and they are double clocked.