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| TTL-Retro, a 12 bit TTL computer http://anycpu.org/forum/viewtopic.php?f=15&t=873 |
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| Author: | B.Bibby [ Tue Dec 07, 2021 5:36 pm ] |
| Post subject: | TTL-Retro, a 12 bit TTL computer |
A 12 bit CPU (4 opcode + 8 data bits) based on a paper by Richard Eckert: "Micro-Programmed Versus Hardwared Control Units: How Computers Really Work", and enhanced with three hardware stacks (Data, Return and Keyboard). It is still an ongoing project, so the software for it so far is a simple reverse polish notation threaded interpretive language, with work on an assembler in progress. I think their use of “Tribble” is an apropos name for a 12 bit word. http://www.mtmscientific.com/stack.html  
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| Author: | oldben [ Tue Dec 07, 2021 9:49 pm ] |
| Post subject: | Re: TTL-Retro, a 12 bit TTL computer |
Looks good. A indirect bit and 16 bits might be a good option for second computer design giving 4096 words of memory. Ben. |
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| Author: | BigEd [ Wed Dec 08, 2021 9:17 am ] |
| Post subject: | Re: TTL-Retro, a 12 bit TTL computer |
Thanks for the pointer to that paper: http://www.cs.binghamton.edu/~reckert/hardwire3new.html |
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| Author: | oldben [ Wed Dec 08, 2021 7:04 pm ] |
| Post subject: | Re: TTL-Retro, a 12 bit TTL computer |
Byte magazine, Jan 1987 has "microcode versus hard-wired control" a 16 bit cpu. |
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| Author: | BigEd [ Wed Dec 08, 2021 8:18 pm ] |
| Post subject: | Re: TTL-Retro, a 12 bit TTL computer |
Thanks - that's here Microcoded Versus Hard-wired Control by Phil Koopman p235 (p255 of pdf) |
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