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Can you help me out with the transformer please as I'm not sure how to wire it up? Also, how did you mount it in the box? I used two M4 countersunk machine screws, two washers, and two nuts to fix the transformer to the case via two 4mm holes I drilled in the case. Before drilling the holes and bef...

Details in next post below... But first, do you have a multimeter? Measure the resistance (Ohms, 200 ohm range) of each of the primary windings. So the first winding is between the connections labelled 1 and 2. The second winding is between the connections labelled 5 and 6. The resistance should be ...

Don't forget all the other holes. Here I show how to do the holes for the transformer fixing machine screws. Once you have drilled the holes, use a countersink drill bit (or similar). Go careful as it is very easy to cut too much, or too little and use a slow speed. Every so often try putting the ma...

Before fitting items to the case, it is far easier to connect some of the wiring first. Strip about 5 to 6mm of the insulation, gently twist the wire strands together using your fingers, then using round nose pliers form a "U" loop. This will give the soldered connection added mechanical s...

Oops Got distracted with this
I will post some more pictures before Saturday ...

Mark

The mains switch is done the same way, but you have to be a bit more careful, as this is a snap in type and too big a hole would be a disaster! More tomorrow
Mark

So, next: preparing the plastic case. Tools I used: fixed metal rule, tool with a sharp point (for marking), battery drill, metal HSS drill bits or wood drill bits (they have to be sharp), needle files, various shape and sizes, somewhere to work where you don't get told off for making a hell of a m...

So, what you appear to be saying, is you need a separate automatic (fast acting) wait state generator that holds the CPU in wait states when addressing the VDP until the VDP can produce it's own wait state. So a 74xx74 flip flop may do the job when linked to the address decoding circuit for the VDP....

I'm sure Dave's been waiting for that

Thanks Bill

Mark

Can you check over my shopping cart when you have a minute as I want to make sure that I've ordered the correct items and with it connecting to mains voltage I don't want it to go bang! I wish there was a Rapid over here as I've had to get bits the parts from different places, but the bulk is from ...