Changes
/* Z80 Shims */
==== Z80 Shims ====
When building a z80 shim, choose a set of header pins for the legs you are plugging into the Z80 socet on the computer's motherboard that are thin (do not use the the standard type) otherwise the Z80 socket will be damaged. Take a look at the pictures of the shims to see what I mean. Solder these headers in first, because the Z80 socket you solder to the shim probably won't let you get access to the pin header once fitted. Make sure they are straight - I use a pair of IDC connectors plugged into the pins to hold them straight during soldering.
The pin headers shown below are the main options when building a Z80 shim.
{| class="wikitable"
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| [[File:Shim leg options.jpg|thumb|Various types of pin headers.]]
|}
* The one to the right is the optimal choice, it has gold plated pins with a circular cross section having a diameter of about .45mm. I use these when building shims for other people.
* The middle one is a "standard" pin header with a square cross section and width of about .65mm. Avoid like the plague, as it will damage the main board socket.
* The left hand one is a sort of combined pin and socket with an acceptable diameter end. It looks tall but as it includes the socket pins it makes the shim easier to build.
Here is a picture of the left hand one in situ. The Z80 sits a bit higher than the first option.
{| class="wikitable"
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| [[File:Z80 shim combined pin-socket option.jpg|thumb|Using the combined pin/socket legs to make a Z80 shim.]]
|}
On the shim's bus connector footprint, pin 1 is labelled "A11" and has a square pad (all the others are round). Use an unboxed 40 way right angled pin header for this, as shown in the photos on this page, or you may find space is too tight inside the computer, and check the orientation of the header and cable is correct before soldering the header in.
