13 Aug
2012
13 Aug
'12
8:37 a.m.
On 8/13/2012 1:53 AM, mc68010 wrote:
As for the TTL designs on the the web most are 8/16 bit computers.
I want 9/18 bits instead. Even with a 9 bit byte you can't get a good
clean instruction set for byte & word instructions.
4 registers S(tack) I(index) A(cc) P(c).
AND,OR,ADD,SUB,LD,ST for byte/word instructions, r)index and r++.
CMA,SRC,SLC for registers.
JCC R+ T,NC,EQ,NE,LT,GE,LE,GT
JSR R+, PSH, EI/DI
Front panel Adress load,run,dep,exam.
Control will be microcoded 512 x 24 with 1 control PCB and 2 9 bit ALU
PCB's.
Ben.
PS. this is nice simple design - smaller than say a PDP 11 stretched to
18 bits.
I don't think any of them want anymore 74 series
stuff. There is no
demand and the Chinese will sell you 1000 of whatever for a dollar. I
needed three and it ended up cheaper to buy 60. Now I have all these
IC here in tubes I will never use. I throw them at the stupid cats
that like to have loud cat sex in my back yard.
Ah free chips ... Meyow! Meyow!