Re: Boxing Bugs CPU cuts-n-jumps

The memory model used here is "linear", that is, it counts from 000b to 111b.
This is as opposed to other memory models used on the CCPU, where you need
the h/w to enforce proper page values, because s/w is capable of writing
any value to the P register. That's why you end up with the J-K; it keeps
out values like 00b and 11b. Looking at an old board, I just used an LS175,
which provided 3 bits, plus a fourth, for a 64K address space. The J-K uses
too many nets.

-Mark

On Mon, Apr 10, 2006 at 09:08:38PM -0400, David Fish wrote:
> Thanks Mark,
>
> It looks like I need another J-K, they seem to be all used up. I suppose I
> could put one at I6.
>
> Dave
>
> ----- Original Message -----
> From: "Mark Shostak" <xx.vl@cinelabs.com>
> To: <vectorlist@vectorlist.org>
> Sent: Monday, April 10, 2006 1:18 PM
> Subject: Re: VECTOR: Boxing Bugs CPU cuts-n-jumps
>
>
> > Dave,
> >
> > I don't know that the cuts and jumpers have been documented, but all you
> > need
> > to do is expand the P register to 3 bits, and map the output directly to
> > the
> > high order program store address bits (i.e. P0 to A11, P1 to A12 and P2 to
> > A13).
> >
> > -Mark
> >
> > On Sun, Apr 09, 2006 at 09:27:47PM -0400, David Fish wrote:
> >> Have the cuts and jumpers that are present on a Cinematronics Boxing Bugs
> >> CPU been documented? The manual just shows the standard schematics.
> >>
> >> Dave
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>
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Received on Mon Apr 10 22:59:10 2006