2 Mar
2006
2 Mar
'06
1:20 a.m.
And in some CPU R0 is a write only register --- you
always read a 0
I think I once mentioned here that I have a machine -- a real,
production, machioe, with 16K words of memory that can be written by the
CPU, that can be excuted as a program, but which cannot be read back by
the CPU as data.
OK, at the hardware level, the memory can clearly be read, since the
contents can be executed. But it's almost write-only memory to the
programmer.
-tony