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| Pathetic Instruction Set Computer http://anycpu.org/forum/viewtopic.php?f=23&t=116 |
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| Author: | Brad R [ Wed Feb 19, 2014 6:50 pm ] |
| Post subject: | Pathetic Instruction Set Computer |
In the "Introduce Yourself" topic, Ed asked: BigEd wrote: Hi Brad - it would be great to see any pictures or info you have of that TTL cpu! As suggested, I am starting a new topic for my reply. "Projects" seemed to be the appropriate forum. Ed, there's a writeup of the contraption at http://www.bradrodriguez.com/papers/piscedu2.htm . For reasons that will become obvious, I dubbed it the "Pathetic Instruction Set Computer." It has a 16-bit microinstruction, and there is no "macroinstruction" set beyond that. If memory serves, it took 22 TTL chips. Schematics are posted with the writeup. I have a wirewrap prototype around here somewhere; when I succeed in excavating it, I'll take a photo. Although the article suggested areas for improvement, I think I'll turn the original design into a PCB. It had a certain elegance and simplicity. |
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| Author: | BigEd [ Wed Feb 19, 2014 9:48 pm ] |
| Post subject: | Re: Pathetic Instruction Set Computer |
Thanks for the link to your writeup - I do like the idea of building a viable CPU from scratch. |
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