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The Gigatron - a TTL CPU in 36 chips (plus memory) http://anycpu.org/forum/viewtopic.php?f=23&t=514 |
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Author: | BigEd [ Fri Mar 23, 2018 1:56 pm ] |
Post subject: | The Gigatron - a TTL CPU in 36 chips (plus memory) |
. It's a TTL CPU, using a modest number of TTL chips and all simple ones. Available as a kit too. Video: Hack42 Lecture: The Gigatron by Walter Belgers and Marcel van Kervinck From the project on hackaday.io: Quote: This is what we have now: • 8-bits system built out of 1970s TTL chips (74LS) • 34 TTL ICs, or 930 logic gates, for the CPU proper • No microcontroller and no complex chips (such as the 74181 ALU) • Only simple ICs, such as AND/OR, 4-bit adders, multiplexers, registers and so on • 6.3 MHz. Might be pushed to 8 MHz • 32kB 70ns RAM • Harvard architecture with EPROM for program/data • Operates on 2.5W, or below 0.5W for the 74HCT version • RISC with pipelining: 1 instructions per clock (sometimes 2...) • Instruction decoding with diodes • Nice instruction set: ADD/SUB/AND/OR/XOR, conditional jumps, many useful addressing modes • 60Hz 64 color VGA and 4 sound channels bit-banged from software • Designed and built on a solderless breadboard in 6 weeks It can run a Mandelbrot demo, or a racer-style game, or a scroller-style game: Edit: see also this previous thread. |
Author: | marcelk [ Sat Mar 31, 2018 8:09 pm ] |
Post subject: | Re: The Gigatron - a TTL CPU in 36 chips (plus memory) |
BigEd wrote: Thanks Ed! Today is 1 year ago this project started with an empty breadboard, half an idea of how it might work, and a hand full of chips. Today strangers are building working Gigatrons Marcel |
Author: | BigEd [ Sat Mar 31, 2018 9:22 pm ] |
Post subject: | Re: The Gigatron - a TTL CPU in 36 chips (plus memory) |
Welcome Marcel - very impressive project! |
Author: | BigEd [ Sun Apr 22, 2018 10:20 am ] |
Post subject: | Re: The Gigatron - a TTL CPU in 36 chips (plus memory) |
. Bit of a video review of the Gigatron kit here, with great praise for the manual: |
Author: | monsonite [ Mon Oct 14, 2019 12:59 pm ] |
Post subject: | Re: The Gigatron - a TTL CPU in 36 chips (plus memory) |
Marcel van Kervinck gave a presentation at VCF Berlin - last weekend, about the design history of the Gigatron. You can watch his 40 minute presentation here: https://media.ccc.de/v/vcfb19_-_126_-_e ... k/playlist And his slides are in pdf form here: https://cdn.hackaday.io/files/207818890 ... ronTTL.pdf |
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