2-ZonsI updated my instruction list using different addressing modes and the new ALU functions. I am over by 57 Instructions. Going to have to do some prioritizing. I can't beleive they didn't even use all 256 Instructions on the 6502 and others. I guess when they were drawing all the microcode manually on massive film, walking on it with their socks it kind of makes sense.
https://docs.google.com/spreadsheets/d/1kbxYGDeIOszgvjPYRdes-bELOBlojT_tjxe_RD9MVUQ/edit?usp=sharing
Added schematic for program counter
https://upverter.com/2-Zons/28ed54fb010b5ac1/Program-Counter-16-bit-Register-for-8-bit-TTL-CPU/
Discussions
Become a Hackaday.io Member
Create an account to leave a comment. Already have an account? Log In.
In your PC diagram : the DOWN inputs of the '193 are left open... That would work for LS but not when you switch to HC or HCT.
Are you sure? yes | no
Fixed
Are you sure? yes | no