| lekernel | I just got myself one of those composite USB recorders and a VGA-to-composite converter | 10:56 |
|---|---|---|
| lekernel | the nice thing is that the VGA-to-composite converter also has a VGA pass-through, so I can simply insert it between the M1 and projector to record future performances ... | 10:57 |
| lekernel | http://www.grand.com.tw/con_hand_view.php?menu=2 | 11:00 |
| lekernel | with this setup, the final picture quality is a bit lousy, but acceptable | 11:01 |
| wpwrak | sounds like a nice concept. "final picture" is the one projected, the one grabbed, or both ? | 11:18 |
| lekernel | the one grabbed | 11:35 |
| Action: lekernel goes looking for suitable gigs in Berlin ... | 11:36 | |
| lekernel | hmm there's something on nov 11.. quite late | 11:37 |
| wpwrak | if you had a little SATA block somewhere, you could grab to a harddisk ;-) that would solve all these pesky quality issues for good | 11:42 |
| lekernel | could the disk handle uncompressed video? | 11:46 |
| lekernel | that's 18MB/s sustained | 11:47 |
| wpwrak | i think the faster ones do something like 50 MB/s these days | 11:48 |
| lekernel | sustained write? | 11:48 |
| roh | yes. especially that | 11:48 |
| wpwrak | lemme see .. c't always has those benchmarks ... | 11:48 |
| roh | linear write/read is the easiest to handle | 11:48 |
| wpwrak | c't got for the latest seagate 4 TB a sustained write minimum speed of 50 MB/s | 11:51 |
| wpwrak | not sure how much buffering you need, though | 11:51 |
| wpwrak | (linear) yeah. start at block 0. write until reset ;-) | 11:52 |
| wpwrak | then plug into PC and process the date | 11:52 |
| lekernel | buffering shouldn't be a big issue, we can easily add more framebuffers than the current 3 into the M1 SDRAM, and add them to the HDD write queue instead of freeing them :-) | 11:52 |
| lekernel | SATA uses the same signaling as HDMI, right? | 11:53 |
| wpwrak | huh ? really ? | 11:55 |
| wpwrak | i would expect it to be wildly different | 11:55 |
| lekernel | both are LVDS... with some small difference it seems, but nothing that can't be taken care of by reconfiguring the FPGA I/Os | 11:56 |
| wpwrak | thingking of it .. i wonder if uSD or at least SD couldn't handle 18 MB/s, too | 11:56 |
| lekernel | maybe it can, but with an horrible overengineered protocol | 11:56 |
| lekernel | not sure SATA is better though | 11:56 |
| lekernel | if we have DVI/HDMI on board, we can also hack a simple passive DVI->SATA adapter to connect the drive :) | 11:57 |
| wpwrak | (sata) i'm sure they had their committee meetings, too :) | 11:58 |
| wpwrak | ah yes, that sounds nice | 11:58 |
| lekernel | I think we should try to switch to the DVI connector (analog + digital) soonish... then we can have passive VGA and HDMI adapters (and composite), and also hacks like this one :) | 12:00 |
| lekernel | it 'just' becomes a matter of FPGA design ... | 12:00 |
| wolfspraul | yes we can try to switch to dvi-i in rc4 | 12:01 |
| lekernel | on the PCB side, it should just be about replacing the connector and wiring the extra digital signals to appropriate FPGA pins | 12:01 |
| lekernel | wolfspraul, what do you think of "digital kaleidoscope"? | 12:12 |
| wolfspraul | he | 12:13 |
| wolfspraul | tell me more | 12:13 |
| lekernel | well, instead of "video synthesizer" ... | 12:14 |
| wolfspraul | ah ok, you mean to market m1 like that? | 12:17 |
| wolfspraul | I shall start reading about kaleidoscopes a bit more, will let you know in a bit... | 12:17 |
| kristianpaul | (dvi-i) sound like lekernel found a new exp header :-D | 12:23 |
| wolfspraul | yes | 12:25 |
| wolfspraul | that's also why I want dual-link if possible (enough space) | 12:25 |
| wolfspraul | geting some more wires out may be helpful later in hacking | 12:26 |
| lekernel | there are restrictions on FPGA pin placement for TMDS signals, we need to check that first | 12:26 |
| Action: lekernel is hacking together a variable high voltage supply to trace the curves of the PWL triode | 12:28 | |
| wolfspraul | lekernel: ok can you check that? maybe some recommendation for the routing guys? | 12:34 |
| lekernel | yes | 12:37 |
| lekernel | and yes, I would expect some special routing requirements too... | 12:37 |
| wpwrak | a "kaleidoscope" is a cheap and simple device ("mirrors and colored glass"). that could produce the wrong associations. even though many effects are kinda kaleidoscopic | 12:39 |
| wpwrak | "digital kaleidoscope" sounds to me like the same product category as "lava lamp", i.e., more the gadget kind than a professional tool | 12:46 |
| wpwrak | of course, if M1 manages to define a new product category, that perception would change ;-) | 12:46 |
| Action: lekernel is abusing a nice variac from a 70's x-ray scanner | 13:02 | |
| kristianpaul | lekernel: the fact that CSR dont have a select input may lead to troubles when writing data at high speeds or continously right? | 13:37 |
| lekernel | huh? no | 14:04 |
| lekernel | yay! volts bonanza. now let's hook up that triode :) | 14:05 |
| kristianpaul | but is okay ignore the wb_sel_i anyway? | 14:05 |
| lekernel | if you're always using full-word write access, yes | 14:06 |
| kristianpaul | ah ok | 14:06 |
| lekernel | and btw that's a wishbone feature, not csr | 14:06 |
| kristianpaul | i know :) | 14:06 |
| kristianpaul | Btw if i'm syncing clock domains between a conbus master and an another csr bus with a separate clock, is okay to do just sync ack, cyc and stb signals as if they we're flags? | 14:09 |
| kristianpaul | ah yes also we :) | 14:09 |
| kristianpaul | i'm currently just doing the cdc using your psync from the minimac2 core, but a memory test again this another csr busgave m1 0.38% error when validing data writes for about 4 seconds :( | 14:11 |
| lekernel | yay, i'm measuring some 1mA of cathodic emission at 95V :) | 14:45 |
| Action: kristianpaul just sent a mail to the wb developer | 15:13 | |
| lekernel | ...and now controlling it with the grid. the triode is good! :-) | 15:48 |
| lekernel | hmm, the thing isn't quite linear, especially for high |Vg|. the grid fails to block all electrons... | 16:04 |
| wpwrak | setting up some death ray guns for the coming zombie attack ? :) | 16:08 |
| lekernel | testing the triode I got from http://lekernel.net/blog/2011/09/prywatna-wytwornia-lamp-where-diy-meets-vacuum-electron-devices/ :) | 16:09 |
| lekernel | I made nice emission and amplification plots ... | 16:10 |
| wpwrak | retro electronics ;-) | 16:10 |
| lekernel | it's not the best triode in the world, but it definitely is a working and usable triode | 16:10 |
| lekernel | which is impressive :) | 16:10 |
| wpwrak | M2 will be a little larger than M1, i guess ? with all the vaccum tubes ... | 16:11 |
| lekernel | I stopped playing with vacuum tubes ca. 2005 :) but this one was too cool for me to resist | 16:11 |
| wpwrak | if you stick to the general concept, that would probably also be the first tube-based FPGA | 16:12 |
| lekernel | http://lekernel.net/blog/2011/10/testing-the-diy-triode-from-pwl/ | 19:12 |
| --- Tue Oct 18 2011 | 00:00 | |
Generated by irclog2html.py 2.9.2 by Marius Gedminas - find it at mg.pov.lt!