64 entries in 0.396s
asciilifeform: last i dun into subj in depth, formed impression that usg may have exterminated (and swallowed the bones of) all extant makers of antifuse rom, in early '90s . on acct of the intrinsic radiation resistance of antifuse vs flash.
a111: Logged on 2019-04-08 09:33 mp_en_viaje: http://btcbase.org/log/2019-04-05#1907031 << one actually wants to have an antifuse boot rom, yes.
asciilifeform: http://btcbase.org/log/2019-04-08#1907362 << funnily enuff, asciilifeform not long ago did the ~quarterly walk of parts catalogues, 'can haz genuine antifuse eprom?' (spoiler : 'nope' just like since when started lookin' in 2013 ) ☝︎
mp_en_viaje: http://btcbase.org/log/2019-04-05#1907031 << one actually wants to have an antifuse boot rom, yes. ☝︎☟︎
asciilifeform: if it were possible to source an antifuse fpga for the http://btcbase.org/patches/fg-genesis/tree/fg.v , thing would be trooly indestructible short of incinerator or train running over it
asciilifeform: and i have nfi currently how to even approach the antifuse 'actel a1010a', antifuses aint even visible under electron micro. prolly will have to be inferred logically.
asciilifeform: and that actel, it's a 1200 gate antifuse fpga (well, without the 'f', lol), turns out.
asciilifeform: http://btcbase.org/log/2018-11-28#1875841 << twist : thing has 622 bits of antifuse-rom state. ☝︎
mircea_popescu: if you don't like that, get an antifuse rom chip for it.
asciilifeform: mircea_popescu: i'd even settle for something entirely like ice40 but with fuse/antifuse bridges
asciilifeform: would also have some antifuse rom on-board, with option to run entirely from same.
a111: 5 results for "blocks antifuse", http://btcbase.org/log-search?q=blocks%20antifuse
asciilifeform: !#s blocks antifuse
asciilifeform: mircea_popescu: i wasn't even thinking of asking for true antifuse sd card , considering that antifuse roms have been unavailable since early 1990s ( see prev thread re subj )
mircea_popescu: asciilifeform, there's some argument (cheapness) for including one single antifuse rather than making the whole thing out of them.
asciilifeform: (blocks really oughta live in antifuse rom. we had a thread..)
asciilifeform: https://siliconpr0n.org/map/nat_semi/dmpal16r/mz_mit20x << antifuse.
asciilifeform: the one 'republican ic' i would immediately put into production if i had a fab, is the humble antifuse rom !
asciilifeform: until silicon can be made piecewise, like a printer page, rather than photographically by the million copies, we are stuck with it. (and antifuse costs 0 and eliminates problem, so i have nfi what mircea_popescu is smoking)
mircea_popescu: wouldja stop clinking to the supid idea ? antifuse my arse.
asciilifeform: but there is such a thing as antifuse.
asciilifeform: it would not be so hard to implement, just put antifuse link in the relevant circuit
asciilifeform: antifuse.
asciilifeform: (i would even use antifuse roms but they are NOT SOLD)
jurov: to warrant antifuse rom wiretap?
asciilifeform: remember, antifuse isn't mask rom
asciilifeform: blocks really oughta live on storage that doesn't measurably wear. luckily this was invented in the '70s, and is called antifuse rom.
asciilifeform: jurov: these likes are from my recent attempt to locate a modern supplier of antifuse rom of reasonable density
assbot: 1645RT2U - Milandr radhard antifuse ROM : weekend die-shot : ZeptoBars ... ( http://bit.ly/1QJBb2G )
asciilifeform: http://zeptobars.com/en/read/1645RT2U-milandr-radhard-antifuse-rom << die shot.
assbot: Logged on 30-07-2015 20:25:52; ascii_field: keep all blocks in antifuse rom
asciilifeform: likely, somewhere in there is an antifuse that, e.g., switches the workfunction to use sha3, or the like.
ascii_field: thing has an antifuse bridge inside
jurov: ^ possible alf's antifuse rom implemntation?
assbot: 26 results for 'antifuse' : http://s.b-a.link/?q=antifuse
asciilifeform: !s antifuse
asciilifeform: to complete this story, i will add a diode on each antifuse and a collective rail to blow'em all
asciilifeform: use a bit once, then blow the antifuse it lived in.
jurov: pogo is useless without hard drive, either (and no, we don't have antifuse rom)
jurov: there's gigabyte antifuse prom?
ascii_field: jurov: not antifuse!
ascii_field: because now i can't use 1MB antifuse roms, etc.
decimation: asciilifeform: thinking about antifuse, a 'jungle' version could be made: make a pcb with 4096 shorts, scrape the desired bitpattern by hand. could be made into a 'pluggable module' and hand-verified
decimation: ideally one would store keys in off-net antifuse
trinque: ascii_field: tactically speaking, supposing there just isn't time for antifuse rom?
ascii_field: now go buy a silicon fab so that antifuse rom gets produced again.
ascii_field: keep all blocks in antifuse rom ☟︎
ascii_field: (mask rom for known blocks from the past, antifuse for future ones)
ascii_field: blockchain really belongs on combo of mask and antifuse rom
ascii_field: (ideally, in one-time-burn antifuse rom, but we don't have it in this box)
asciilifeform: called antifuse fpga
asciilifeform: http://www.design-reuse.com/news_img/20031024_actel4.gif << antifuse
asciilifeform: own antifuse ?!
mircea_popescu: just use your own antifuse.
asciilifeform: ^ the 'won't boot anything not signed by key in antifuse rom' thing - finally arrived.
asciilifeform: mircea_popescu: data sheet reveals that there is, in fact, 64 bits of antifuse eprom in there. but it appears that 'pogo' was lazy, did not use these for anything.
asciilifeform: whenever someone says 'immutability', i wish i could replace his ram with antifuse rom.
asciilifeform: mircea_popescu: just gotta bring back antifuse. it doesnt really get much simpler than antifuse.
asciilifeform: wonder if anyone else has toyed with the idea of hardware purpose-built to store blockchain. think ssd, but write-only (antifuse! etc)
asciilifeform: now go and try to buy a 1980s style antifuse ROM that actually burns
asciilifeform: anyone else notice how you more or less can't buy antifuse roms any more?
asciilifeform: coin should be electronic. with small camera, dead-reckoning navigation gyro... antifuse ROM for log.
asciilifeform: at any rate you set the flag once in antifuse & forget about it.
mircea_popescu: B) Cardano’s firmware. This is a socketed antifuse (OTP) ROM which is unique to your unit and is engraved with the latter’s serial number. If desired, it can be read on a common instrument sold for this purpose and its contents checksummed or otherwise perused. The checksum of your firmware ROM is printed on the bottom of the chassis, under the unit’s serial number. For your safety, this ROM is non-reprogrammable