The 8008 instruction set was not designed by Intel IIRC, so the lineage ends at the 8080. Independently the 6502 also had a downward stack. I think the only mo

The 8008 instruction set was not designed by Intel IIRC, so the lineage ends at the 8080. Independently the 6502 also had a downward stack. I think the only modern machine with am upward-growing stack is the HP PA-RISC.