Allison wrote:
>
> From: Ben Franchuk <bfranchuk_at_jetnet.ab.ca>
> >Since I have no way of having a chip of 80's technology made I have to
> >limit the design to what looks realistic for that era.
> I dont get that? You want a 4mhz z80 or 5mhz 8085? Those are relatively
> common. Now, if your doing PDP-8 era then 1.2uS instruction cycle was
> the number, slow by todays standards. Only 1000x slower. That is 10x for
ever 10 years.
What I wanted was a 12/24 bit CPU. Other than the 6100 cpu ( over
priced? )
by DEC nobody has ever put a octal machine 24:12 or 18:9 or 36:18:9 on a
chip.
(Ignoring PDP-10 stuff) to my knowledge.
BTW back then I had a Z80 kit, but problems with a home brew power
supply
kept it from running well.
> >This is what this is -- a hobby/ learning tool --
>
> In the early 80s, I really was trying to do what zilog eventually did,
> make a Z280 more or less. That and figure out what this ucode
> thing was all about.
I have yet to see a nice micro-code example. All the micro-code
I have done ( on paper ) needed 32+ bits for a 2901 design.
Also about 2K of ROM. TTL controller. It got messy after you added
a MAR, In/out registers, and stuff like opcode decoding.
> >If it was $$$ making I would have to move to Seattle. :)
>
> Now that's depressing. ;)
You tell me how I can make $$$ and I will not move to seattle.
Deal? I could move to Antarctica and make linux boxes. Take a
penguin and stuff it in old 386. Stamp exported from 'Finland'.:)
--
Ben Franchuk --- Pre-historic Cpu's --
www.jetnet.ab.ca/users/bfranchuk/index.html
Received on Tue Dec 18 2001 - 12:44:52 GMT