Andrew StarrI modified the FF jig to test the AND gate I had soldered. The jig tests each gate with all 4 binary combinations of input, and looks for the correct binary result. 4 green lights = 4 good gates:
Each gate has a red LED to indicate output state.
I also did some speed tests. Here's a gate output waveform with both inputs driven by a 1 MHz square wave:
and at 2 MHz:
some over/undershoot present but not too bad. There is provision on the module for loading some capacitance to smooth it out if necessary. I would have liked to have driven it faster to find its maximum switching speed but my signal generator only goes up to 2 MHz.
Finally, I wanted to see some lights blinking so I wrote some crappy arduino code for the jig to do it:
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The documentation that exists is all in the project details. The rest is in my head or hasn't been decided yet. I'm making a point not to plan too far ahead to avoid being overwhelmed :) Right now I'm concentrating on the Data and Return stacks. The address decoder panels have been built. As soons as I have all the plug-in modules I need, I can get the up/down address counters and row/column core matrix selection working.
Then there will be a mini-research project to get the 8x8x8 stack core matrices working.
That will leave:
1. The system memory (more or less a larger version of the stack, with a loadable address)
2. ALU - nothing special here, just a matter of enough logic
3. Program ROM
4. Microcode control
Then I'll be down to the mostly cosmetic stuff like operator panel, I/O etc.
Don't fret about an emulator...plenty of work to do first!
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That's pretty cool :-)
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Thanks! Now I just have to make some OR and NAND modules and I can get the up/down counter section of the address decoders going
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That's pretty easy, once the AND works :-)
Still there is the question of your overall architecture.
I suppose that your main PCBs are already made so you must have a rather good idea or plan but you don't document it openly. This makes it difficult to write an emulator of the T-1.
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