Re: Turbo232 UART Cart HDL

From: silverdr_at_wfmh.org.pl
Date: Sun, 15 Dec 2013 22:04:10 +0100
Message-Id: <FC433EB2-96CD-478D-BBD6-A177141A5195@wfmh.org.pl>
On 2013-12-13, at 22:09, Gerrit Heitsch <gerrit@laosinh.s.bawue.de> wrote:

>>>> Novaterm and DesTerm 128 also support the HART cartridge from
>>>> Hatronics.  This was an 8250-based design.  It should be possible to
>>>> install a 16550 in a HART cartridge but I haven't tried it.
>>> 
>>> Does anyone have more information on that cartridge?
>> 
>> I have a HART cartridge.  I added a page for it:
>> http://mikenaberezny.com/hardware/c64-128/hatronics-hart-rs-232/
> 
> The trace for +5V (bottom left) seems to have gotten a bit hot at some time. That's what happens when you do the layout with all traces being the same size, even those that should be wider (+5V and GND).
> 
> Also, whoever designed this was a bit stingy with the 100nF decoupling capacitors. I'm kinda surprised that it works.

Yeah - they designed a working logic but it looks like didn’t have anyone layout savvy at the time. My PCBs in the early nineties shared similar properties (decoupling? who cares?!, is connection there? Good - who cares that all traces the same default width?!, wildly autorouted and voila). Not that I learned /that/ much since then, though ;-) I worked (consulting job two years ago) in a German company where they had professional layouters who did only this for years and there were always problems with EMV for example. They eventually hired a guy whose job was only to verify the layouts before they go to production and then fail on the EMV test bed again and again.

-- 
SD!


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Received on 2013-12-15 22:00:04

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