I used to make similar computers: wire-wrapped things that I'd never do today - 8086, 80186 and twice 2900 bit slices. I was never able to purchase a set of 432

I used to make similar computers: wire-wrapped things that I'd never do today - 8086, 80186 and twice 2900 bit slices. I was never able to purchase a set of 432 chips. No one had any for sale, or perhaps not for sale to me.