Hi everyone!
Over the last few months I've become obsessed with building my own homebrew computer.
Instead of doing everything with breadboards and 7400s, I'd like to go for a very simple architecture (SAP1 or alike) and implement it with NPN transistors.
I use Logisim to simulate the logic, and unfortunately the lack of diode is proving troublesome.
For instance here is a transistorized XOR gate:
It takes five diodes and Logisim can't simulate them, being a pure logic simulator. Without a XOR gate I can't even build an adder.
I've tried other simulators (Hades) and none of them simulates diodes. I don't know of any software that would let me design and simulate a homebrew CPU both at the logical and electrical level (I'd like to keep my hands off verilog at the moment).
Any advice or suggestion?
Over the last few months I've become obsessed with building my own homebrew computer.
Instead of doing everything with breadboards and 7400s, I'd like to go for a very simple architecture (SAP1 or alike) and implement it with NPN transistors.
I use Logisim to simulate the logic, and unfortunately the lack of diode is proving troublesome.
For instance here is a transistorized XOR gate:
It takes five diodes and Logisim can't simulate them, being a pure logic simulator. Without a XOR gate I can't even build an adder.
I've tried other simulators (Hades) and none of them simulates diodes. I don't know of any software that would let me design and simulate a homebrew CPU both at the logical and electrical level (I'd like to keep my hands off verilog at the moment).
Any advice or suggestion?