13 Apr
2002
13 Apr
'02
10:15 a.m.
Richard Erlacher wrote:
(computer science stuff)
Shift register stacks do have the advantage of being fast. Did not the
8008 or the 4004 use a 8 level stack for subroutine calls. A calculator
chip at that time only needed 4 functions.
--
Ben Franchuk - Dawn * 12/24 bit cpu *
www.jetnet.ab.ca/users/bfranchuk/index.html
I told it was a semantic quagmire.
I really
don't care what it was called.
Of course you
can build a stack without a counter. In the real world a
shift register will do it (I've used a row of 'F194s to make a subroutine
stack). Or a pile of bits of paper with numbers written on them :-). You
do not have to make a stack (particulary not in the 'theoretical world')
using a counter
Oh forgive me for trying to be practical. It takes a LOT of shift registers
to build what you can build with an up/down counter and a RAM.