RE: [N8VEM-S100:3067] GAL's and PALASM

["John Monahan" <mon...@vitasoft.org>]

That's great David. When we actually come to doing the production boards we
will probably supply the relevant programmed GAL's. They cost next to
nothing.
John


-----Original Message-----
From: n8vem...@googlegroups.com [mailto:n8vem...@googlegroups.com] On
Behalf Of David Riley
Sent: Wednesday, April 9, 2014 8:29 AM
To: n8vem...@googlegroups.com
Subject: Re: [N8VEM-S100:3067] GAL's and PALASM

On Apr 9, 2014, at 1:45 AM, monahanz <mon...@vitasoft.org> wrote:

> Guy's just wanted to mention I have "see religion" in terms of using GAL's
to simplify our future more complex S100 boards.
>  
> As we move to CPU's like the 80486 and higher it is clear the 74LSxxx
chips alone will not fit on a single S100 board to carry out the functions
of these CPU's. I have also concluded that I will need them for out ISA to
S100 bus converter board and XVGA type video boards.  These are all projects
in the works and will probably not see the light of day for some months.
> 
> To expose GAL's to those that may not be fully aware of them, I have
written up a short introduction here:-
> 
>
http://s100computers.com/My%20System%20Pages/ISA%20to%20S100%20Bus/Intro%20T
o%20GALs.htm

GALs are great, and they're period-appropriate for the machines you're
talking about (PALs even more so).  The original Macintosh achieved its size
only because of heavy use of PALs.  GALs have equivalent modes to PALs, and
are great for prototyping before burning a PAL permanently (which you might
want to do if you wanted to be more period-appropriate).

If anyone wants PALs/GALs burned and doesn't have the equipment, I'll be
glad to do it for the cost of parts and shipping (just shipping if you send
me the parts) if you have the bitfile; I have a ROM burner that does them
just fine.  Just email me privately.


- Dave

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