Post by Gareth Evans
Am I right in thinking that the instruction set only
offered 32 bit and 64 bit operations?
(Continued discussion from comp.sys.raspberry-pi)
Pretty much. There were insert and zap operations that could be used
to extract an insert bytes. And they added byte and word loads and stores
in a later revision; originally, Alpha could only load and store longwords
The first round of workstations had "swizzle space" to do byte and word
I/O; some of the address bits were used to indicate which bytes were
involved in the transfer. This was truly annoying.