[Coco] Gal Logic

[Mark Marlette]

At 10:02 PM 1/30/2004 -0500, you wrote:

James,

Almost all of my EPROM program is for the beloved little CoCo! :)

We have FLASH on the CoCo now, four selectable banks via hardware or software.

VERY COOL!

Mark
Cloud-9


>Mark
>
>Agreed that the GALs are cheaper than most CPLDs. GALS are now
>becoming a bit more difficult to find. Lattice seems to be the main
>manufacturer of them. As for CPLDs you have Lattice, Xilinx, Altera,
>Atmel, and Cypress all in that market.
>
>CPLDs are a bit more flexible and quite abit of the standard TTL logic can
>be implemented. Xilinxs smallest is the XC9536 which has 36 macro cells
>or the equivalent of 800 gates for around $3 to $4 single unit price.
>
>Then again if you want to program multiple devices like GALs and memory
>then you can invest in multiple programmers like that you have. Gosh
>EPROMs, I almost forgot what those were since flash memory has gotten
>so cheap.
>
>james
>
>On 30 Jan 2004 at 20:24, Mark Marlette wrote:
>
>Date sent:              Fri, 30 Jan 2004 20:24:22 -0600
>To:                     CoCoList for Color Computer Enthusiasts
><coco at maltedmedia.com>
>From:                   Mark Marlette <mmarlett at isd.net>
>Subject:                Re: [Coco] Gal Logic
>Send reply to:          CoCoList for Color Computer Enthusiasts
><coco at maltedmedia.com>
>         <mailto:coco-
>request at maltedmedia.com?subject=unsubscribe>
>         <mailto:coco-
>request at maltedmedia.com?subject=subscribe>
>
> > At 10:11 AM 1/30/2004 -0500, you wrote:
> >
> > James,
> >
> > I agree and disagree depending on the target. GALS are under $1 and if
> > they will work then that is what I'll use. I use Altera's Max Software
> > and that is free as well. I bought The DataMan 48LV programmer, that
> > is what was $1300 plus some adapters. It does almost everything and
> > that is what I needed. EPROMs, PAL, GALS, MPU, CPLD, serial EPROMs,
> > etc.... Have used them all here at Cloud-9. New designs use JTAG
> > programmers which I designed my own off of an Altera design. Improved
> > and self powering with multi-voltage support. Altera's programmer for
> > their free software is still $150. Haven't done Xilinx, Altera seems
> > to do well in the CPLD arena for me and very cost effective.
> >
> > I look at what the target is and I pick the product that fits the app
> > the best. It would be easy from a training standpoint just to use one
> > product line but I have yet to see one vendor have the solution for
> > everything.
> >
> > Mark
> > Cloud-9
> >
> >
> > >Mark
> > >
> > >My personal belief is to get away from a GAL and go to say one of the
> > >smaller CPLDs. Beisdes doing any glue ligic that he is thinking of
> > >there will always be a few other gates and stuff that can be thrown
> > >into a CPLD that makes it a cost effective means.
> > >
> > >Besides the CPLDs are jtag programable and the software to design
> > >them is free, well at Xilinx is.
> > >
> > >james
> > >
> > >
> > >On 29 Jan 2004 at 23:35, Mark Marlette wrote:
> > >
> > >Date sent:              Thu, 29 Jan 2004 23:35:03 -0600
> > >To:                     CoCoList for Color Computer Enthusiasts
> > ><coco at maltedmedia.com>
> > >From:                   Mark Marlette <mmarlett at isd.net>
> > >Subject:                Re: [Coco] Gal Logic
> > >Send reply to:          CoCoList for Color Computer Enthusiasts
> > ><coco at maltedmedia.com>
> > >         <mailto:coco-> >request at maltedmedia.com?subject=unsubscribe>
> > >         <mailto:coco-> >request at maltedmedia.com?subject=subscribe>
> > >
> > > > At 11:55 AM 1/29/2004 -0600, you wrote:
> > > >
> > > > I do. Whgt development tools are you using? Abel? Most of what you
> > > > are trying to do are operators. What is your target device? How
> > > > are you going to program it once you have the equations written
> > > > and compiled? Programmers run $100- $50k depending on what you
> > > > want to do and how many. Mine is $1300.
> > > >
> > > > ??
> > > >
> > > > Regards,
> > > >
> > > > Mark
> > > > Cloud-9
> > > >
> > > >
> > > > >Does anyone know how to program a coco type clock generator
> > > > >into a GAL chip? I understand combinational logic fairly
> > > > >well, and am able to use "boolean" logic equations. My
> > > > >understanding of "clocked" OR "Registered" logic is a bit
> > > > >rusty.
> > > > >What I want do do is build a dual J-K flip flop E and Q clock
> > > > >generator in a GAL device not in TTL! Also is there a library
> > > > >somewhere of equations for flipflops etc? Eric KB0LXY
> > > > >
> > > > >--
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