NAND madnes - Page 1
Forum section: electronics / general

author: hanndoddi
author_rank: Contributor
timestamp: March 21, 2013, 06:24:22 pm
content: I was looking at this link from last show #137.This guy must really like NAND gates lol.http://www.adafruit.com/blog/2013/03/15/nandputer-functionally-complete-and-absolutely-necessary/Any one know more crasy wire projects like this?

author: justanothercanuck
author_rank: Frequent Contributor
timestamp: March 22, 2013, 12:50:44 am
content: http://www.bigmessowires.com/bmow1/Quote

author: amyk
author_rank: Super Contributor
timestamp: March 22, 2013, 06:27:54 am
content: Here's another:http://www.homebrewcpu.com/But the difference between OP's and all the other TTL CPUs is in its exclusive use of NAND gates; it's BOM diversity reduction taken to an extreme. The Johnson counter sequencer and the general slowness is reminiscent of the CDP1802.

author: jcook1979
author_rank: Newbie
timestamp: March 22, 2013, 09:23:20 am
content: Wow, that's cool! Is a schematic available?

author: Rerouter
author_rank: Super Contributor
timestamp: March 22, 2013, 09:40:57 am
content: its taking De Morgans theorem to its expected outcome, you can make and, or, nor, xor, xnor, not + buffers out of only nand gates, so realistically he is just adding a few additional steps into the loop,

author: digsys
author_rank: Unknown
timestamp: March 22, 2013, 10:16:26 am
content: I'd HATE to be working out the sync for propagation delays !! My FIRST computer model I made was in '70-71There were rows of toggle switches and Leds - 16 Address, 8 Data, Load/Clr/Run/Stop etc. I loaded the program one line at a time.There was NO "oops", if you did a wrong load, you started again. The novelty wore off QUICK !! :-)I've wire-wrapped some pretty big systems, but none that big or messy !!

author: Slothie
author_rank: Regular Contributor
timestamp: March 22, 2013, 02:37:32 pm
content: In the 80s I built a 6809 based computer using TTL support logic and static RAMS. That was done using perf board with copper "lands" and the Verowire wiring system. It was mounted in an old PDP8 case/PSU (wish I still had that!!). had a front panel with toggle switches & LEDs, took up 3 eurocards and the front panel stripboard, and I thought there was more wire than feasible. I obviously now see I was hardly trying compared to the efforts of these guys!!I chucked my system in the mid 90s not realising how much I'd wish I didnt nowHowever, I do have a box with 6502's, Z80's and 6809's, RAM chips, 3o pin SIMMS, and about 50 2716 EPROMS.... I think there may be an 8bit micro or 2 in my future....

author: digsys
author_rank: Unknown
timestamp: March 22, 2013, 11:00:08 pm
content: The 6809 was my most favourite CPU for a long time, it was awesome. Tandy released a TRS80 (I think) based on it.Then just as it was gaining popularity, 16 bits came into production, and it was lost in time. Sure miss it :-)

author: Slothie
author_rank: Regular Contributor
timestamp: March 28, 2013, 12:04:44 am
content: Quote from: digsys on March 22, 2013, 11:00:08 pmThat was the TRS80 "Color Computer". Great machine, very advanced for its time, too expensive to compete with the Commodore 64 and Atari 800 when it came out in 1980 and by 1986 the Atari ST and Amiga blew it out the water despite many upgrades!

author: Moshly
author_rank: Regular Contributor
timestamp: July 19, 2013, 09:35:21 am
content: NAND is not that madBack one level ->http://makezine.com/2006/09/22/homemade-mt15-computer/Doh: The original page is goneAnd back another ->http://www.nablaman.com/relay/progress.phpuntil ->

author: digsys
author_rank: Unknown
timestamp: July 19, 2013, 10:06:39 am
content: COOOL, I'd love to see one using watermelons though .. that would be unique

author: Markybhoy
author_rank: Regular Contributor
timestamp: July 23, 2013, 06:14:57 pm
content: http://youtu.be/n3wPBcmSb2U

author: amyk
author_rank: Super Contributor
timestamp: July 26, 2013, 12:05:42 pm
content: http://klabs.org/history/ech/agc_schematics/All NOR gates.