I've built the 555 based circuit By Ziggurat http://zx.zigg.net/misc-projects/
I plan to use it on a ZX80 but meanwhile tested it with my CZ1000.. with a Ferranti 2C210E ULA which grates an appropriate back porch. What I've noticed is a really crisp, steady and noiseless K cursor but with a black left border.. is this because the preexisting backporch added to the new one or did I messed up something?
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