More thoughts on building a Z-80 (64bit!!!)

From: jpero_at_pop.cgocable.net <(jpero_at_pop.cgocable.net)>
Date: Fri Oct 23 10:44:16 1998

> Date: Fri, 23 Oct 1998 00:32:20 +0100 (BST)
> Reply-to: classiccmp_at_u.washington.edu
> From: ard_at_p850ug1.demon.co.uk (Tony Duell)
> To: "Discussion re-collecting of classic computers" <classiccmp_at_u.washington.edu>
> Subject: Re: More thoughts on building a Z-80 (64bit!!!)

> > WIRE_WRAP!?!?!?! ICK! I usually pull out my cheapo PCB CAD program......
>
> Actually, for prototyping wire-wrap is a lot faster to do, and it'll
> clock faster as well. It's much easier to get a good ground plane on a
> wire-wrapped board than a double-sided PCB

Wire wrap?...hmmm I have problems with that in ohmic losses even the
connections is good, soldering them helped a bit but no dice.

> So what you really want is an I/O page and an addressing mode (a bit like
> Direct Page on the 6809) that accesses the I/O ports. And also allows
> them to be accessed by normal memory reference instructions.

Have data transfers done with DMA, all memory mapped and irq driven
to knock subCPU as needed to grab data then place it in CPU's lap.
Leave CPU alone for processing. How about that?

>
> -tony

Jason D.
email: jpero_at_cgocable.net
Pero, Jason D.
Received on Fri Oct 23 1998 - 10:44:16 BST