[sdiy] TTL Etiquette?

[Metrophage]

Hi Magnus! Your message was temporarily detoured through Yahoo land!

--- Magnus Danielson <cfmd at bredband.net> wrote:
> For real TTL, you can just leave the inputs. For HC and HCT you
> should have the decency to hook them to ground or +5V as you see fit.

Ok, LS seems real enough - it's not CMOS.

> CMOS always require you to bolt unused inputs to something (except
> maybe to the electrical wire pointing up in the dark sky that you
just got from a
> fellow called Franklin).

Nor any of these! <
http://chem.ch.huji.ac.il/~eugeniik/instruments/archaic/static_machines.htm
>

> Don't forget to hook caps over each chip.

Such as a .01-.1 UF cap between VCC and ground?
 
> Why not just use the 4 MHz clock directly?

All macintosh MIDI interfaces which I know of run at 1 MHZ, and the
drivers expect it to be as such. I don't know whether or not the serial
ports can handle 4 MHZ, but I don't currently have time to try making
new drivers for this old machine. 

Thanks for the suggestions!
CJ


		
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