[Coco] Gal Logic

jdaggett at gate.net jdaggett at gate.net
Fri Jan 30 22:50:56 EST 2004 

Mark

I disected the MEade ETX Autostar Telescope Controller and it uses 
a 68HC11E1 with two 512Kx8 Flash that is banked switched in 32K 
blocks. Believe me they have all but 64K of the two flash chips 
filled. The main program takes about 250K and the rest is star 
catalogs and two 32K banks for user storage. 

Other than Cost I could not see why they didn't use the 68HC11K4. 
It would have made their hardware abit more simpler. Oh well when 
cost rules, one has to do some funny tricks to get things to work. 

james.

On 30 Jan 2004 at 21:09, Mark Marlette wrote:

Date sent:      	Fri, 30 Jan 2004 21:09:07 -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 
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> 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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