12 Dec
2008
12 Dec
'08
10:19 p.m.
On 12 Dec 2008 at 14:31, bfranchuk at jetnet.ab.ca wrote:
That is 3 opcode bits and a indirect bit. Going to 4
opcode bits
gives you 32K of memory and would make a nice small machine
that dates around the early 60's.
The problem is that I want to have local function variables, and that
requires
I suppose that a 16-bit (or 20-bit 3-(16/32 register) address design
would be too complex. But it would give you the flexibility you need
without an explicitly-implemented hardware stack. Make one of the
registers PC and branches get interesting.
Who needs registers or indirect addressing anyway? IA was an
*option* on the CADET. Instruction modification was a way of life.
Cheers,
Chuck