Date   : Mon, 24 Mar 2008 21:06:33 +0100
From   : kortink@... (John Kortink)
Subject: New 6809 TUBE

On 24 Mar 2008 15:54:03 +0000, Jonathan Graham Harston wrote:

>> Message-ID: <hpddu31df1ktg0dg7hal4hcld9sevp393d@...>
> 
>John Kortink wrote:
>> On 22 Mar 2008 19:52:00 +0000, Jonathan Graham Harston wrote:
>> >Eurghhh!!! I *hate* designes that use PALs and GALs. You just have
>> 
>> What nonsense. Programmable logic is actually the preferred way,
>> and is in no way an indication of complexity, let alone one of
>> needless complexity. It's perfectly reproducible if the programmed
>> circuitry is known,
> 
>*EXACTLY*!!!!

Which is the case here. A fact easily obtained by asking first.

>You are faced with a circuit diagram with an annonymous blob in
>the middle of it with no knowledge of what it does. You have to
>read the mind of the, often unobtainable, designer to discover
>what it does.

Or just accept the fact most designs are not made to
facilitate reproduction by others, much like with
software. If they were, the knowledge would have been
made available.

>If a circuit has an '02 and a '139 you can see completely,
>exactly, and unambiguously exactly what it does.
> 
>> Do you really know so little about the subject, or do you just
> 
>I know enough about the subject having spent hughly frustrating
>days and weeks when trying to design the BBC IDE interface faced
>with millions (ok, exageration) of designs all predicated on PALs
>or GALs, just to impliment "decode selected address".

If it's that simple it's figured out in 5 minutes.

Otherwise, tough cheese.


John Kortink

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