RE: CIA Serial Registers on C128

ruud.baltissen_at_abp.nl
Date: 2002-02-27 08:34:17

Hallo Nick,

> I was thinking to simply use a DIODE and have the device
> drive the line high when not needed.

That's OK. This is the same way the XE1541-interface works. 

> I can never remember which way to face the DIODE

           |\  |
           | \ |
device ----+  >+---- CNT1 / SP1
           | / |
           |/  |

The cathode (the black line at the top of the triangle) is marked as a black
band around the diode (silver when diode is black itself). For speed reasons
you better can use so-called Scottky-diodes (spelling ??).

> but do you think that this will be enough to avoid 
> pulling on CNT1 and SP1?

See first remark.

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