DASEGOS: Multiplier

[Zaratustra]

This little machine multiplies two numbers from 0 to F. The result will appear on the striped tiles, the least significant digit on top and the most significant on bottom.

Other ideas on the same venue could include:

> More digits
> Other operations
> Decimal digits instead of hex

[sluutthefeared]

Here's mine. tivolic
I had some troubles, but I think I got it worked out.

[sluutthefeared]

I was looking at yours and I noticed the most significant digit is off in some cases, such as D*D or B*9.

In the case of B*9, the least significant bits with a carry should be 2,4,6,8,1,3, but yours ends with an extra 2 in it, 2,4,6,8,2,1,3. Not sure where that extra 2 came from since it shouldn't be repeated again, possibly a timing problem there?

Also, in some cases comparing the least significant bit with the initial operand doesn't work properly.
For example, 8*A is 50 and 9*A is 5A. When comparing the least significant bit with the operand the machine will count that A as a carry when it's not.

[sluutthefeared]

I decided to make another.  zobuzid
In this one I used some tricks to get it to run at full speed and be a bit more compact.

[sluutthefeared]

I enjoyed working on this problem before, so to get used to the physics changes I decided to return to it.
xyhedaz

[colcolpicle]

I made another multiplyer lehapyk

[Rene]

That's cool. It inspired me to make this decimal adder:
http://kevan.org/rubicon/forums/index.php/topic,334.0.html

Maybe somebody can transform that into a multiplier for arbitrary long decimal numbers?