Homemade Capacitor
Moderator: BigEvilCorporation
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I'd go crazy if I had to do a ALU (and I have no idea where to begin)...
Mida sa loed ? Nagunii aru ei saa
http://www.tmeeco.eu
Files of all broken links and images of mine are found here : http://www.tmeeco.eu/FileDen
http://www.tmeeco.eu
Files of all broken links and images of mine are found here : http://www.tmeeco.eu/FileDen
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Simple summator is (A XOR B) as Result and (A AND B) as Carry.TmEE co.(TM) wrote:I'd go crazy if I had to do a ALU (and I have no idea where to begin)...
A B C F
0 0 0 0
0 1 0 1
1 0 0 1
1 1 1 0
Maybe you can use ALU chip. Even in USSR IC logic was one. К155ИП3 => 74xx181. It is 4 bits, but it can be expanded. And Carry flag supported.
Schematic diagram:
Opcodes table:
PS On pictures "B" = High (logic 1) and "H" = Low (logic 0)
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I just used the TTL ALU chip (4 bits wide)... microcoding was enough work to satisfy my cravings. I was able to clock it up to the speed of the EPROMs. I used a two-stage pipe to make it easier to handle the output delay from the ALU. Also made the flow control of the microcode easier.
One guy I knew did the ALU as discrete parts. His proto board was about three times the size mine was. A lot of stuff in an ALU. I checked with the professor before using the ALU to see what the limit was on parts we could use. A lot of folks in the class used a Xilinx part.
One guy I knew did the ALU as discrete parts. His proto board was about three times the size mine was. A lot of stuff in an ALU. I checked with the professor before using the ALU to see what the limit was on parts we could use. A lot of folks in the class used a Xilinx part.
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Well, I'm not gonna make any CPUs, I'll rather spend a little on a 68K or Z80 (or whathever I want)... it will be lot cheaper (and lot less fun).
Mida sa loed ? Nagunii aru ei saa
http://www.tmeeco.eu
Files of all broken links and images of mine are found here : http://www.tmeeco.eu/FileDen
http://www.tmeeco.eu
Files of all broken links and images of mine are found here : http://www.tmeeco.eu/FileDen
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- Very interested
- Posts: 2984
- Joined: Fri Aug 17, 2007 9:33 pm
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First I finish 12th grade, and then go to technology school and then I'll maybe start doing some more serious hardware stuff... now I just don't have enough knowledge...
Mida sa loed ? Nagunii aru ei saa
http://www.tmeeco.eu
Files of all broken links and images of mine are found here : http://www.tmeeco.eu/FileDen
http://www.tmeeco.eu
Files of all broken links and images of mine are found here : http://www.tmeeco.eu/FileDen