[Coco] MPI replacements?

[Little John (GIMEchip.com)]

Putting the whole thing in a CPLD would be the most flexible method. It 
would allow entire restructuring of the device on the fly. I'll decide soon 
as to how to proceed - I'm currently engrossed in the memory upgrade, which 
is being problematic (human error, but I shall not give up)
Thanks All - John

----- Original Message ----- 
From: "Phill Harvey-Smith" <afra at aurigae.demon.co.uk>
To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
Sent: Saturday, July 10, 2010 2:29 AM
Subject: Re: [Coco] MPI replacements?


> On 09/07/2010 21:15, Rob Rosenbrock wrote:
>> Rather than a GAL or discrete logic, have you ever considered using a
>> small ROM? I've seen one implemented utilizing it as a truth table.
>
> The problem with using a Rom or a GAL/PAL is that you need an external
> programmer to program the logic into them. Programmers for these devices
> are generally quite expensive.
>
> The advantage with a CPLD is that they are generally in circuit
> programmable with a cable that can be purchased or made relatively
> cheaply. Also it makes changing the logic much easier. They are
> generally available in PLCC (such as the Xilinx 9536/9572/95108 and the
> XL versions) which means they can be socketed and don't then need any
> surface mount soldering.
>
> Just my 2p/2c :)
>
> Phill.
>
>
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