08:45 <Wanda[cis]> wheeee pakige

08:46 <galibert[m]> So cute

08:46 <whitequark[cis]> nice

08:46 <galibert[m]> rampak too, very nice

08:46 <whitequark[cis]> is that progesterone

08:46 <Wanda[cis]> um

08:46 <Wanda[cis]> right

08:46 <Wanda[cis]> maybe

08:46 <Wanda[cis]> ... I should clean this desk

08:47 <Wanda[cis]> the rampak is incredibly thin, to the point that I'm worried about damaging it

08:47 <galibert[m]> well now I understand how it can fit inside

08:47 <whitequark[cis]> Wanda[cis]: it's sturdier than it looks

08:48 <vegard_e[m]> I feel like that every time I handle a M.2 SSD

08:48 <galibert[m]> she's a cat though, they can be kinda destructive :-P

08:49 <Wanda[cis]> wait I got two different rampaks?

08:49 <Wanda[cis]> holy shit esden

08:49 <Wanda[cis]> (turns out there's another ram-pak inside the case)

08:49 <galibert[m]> You deserve it :-)

08:49 <omnitechnomancer> grasp it firmly

08:54 <Wanda[cis]> well

08:54 <Wanda[cis]> I guess the other case goes onto my revC1

08:55 <Wanda[cis]> (and so does the other ram-pak)

09:07 <Wanda[cis]> oh hey there's a sync cable

09:07 <whitequark[cis]> yeah v3

09:08 <whitequark[cis]> * yeah :3

09:09 <Wanda[cis]> their fates are now forever intertwined

09:09 <Wanda[cis]> (or at least until I disconnect the cable)

09:09 <whitequark[cis]> this, too, is yuri

09:36 <Wanda[cis]> glasgow with wings (it's an angel girl)

09:37 <jn> :o

09:37 <whitequark[cis]> nice

11:10 <Darius> needs more eyes for biblical accuracy

11:21 <jn> aren't ten eyes enough?

11:21 <jn> (they're in the back and unlit though, in the picture)

11:24 <galibert[m]> Any idea how long I can reasonably make a triplet of wires transporting serial audio (e.g. sclk, lrclk and data) before signal integrity goes to shit?

11:27 <Darius> galibert[m]: depends on the frequency/rise time, driver characteristics, termination and cable type

11:28 <Darius> eg you could turn it into LVDS and run it over CAT5 cables for quite a ways (10s of metres perhaps)

11:29 <galibert[m]> I think it's 20bits/sample, so around 2Mhz, driver is an asic, cable type is I don't know, something I'll have to solder over some through-hole resistors, and termination would be a glasgow connector

11:30 <galibert[m]> distance is enough to get out of the synthesizer

11:30 <galibert[m]> but not significantly more than that

11:30 <galibert[m]> would like to have digital output out of my psr540

11:44 <Darius> galibert[m]: it depends on the signal rise time rather than the frequency directly but you'll probably be fine, you will probably want some series termination at teh glasgow end

11:44 <galibert[m]> what does that look like?

11:45 <galibert[m]> I'm inexistant where it comes to non-digital electronics

11:45 <Darius> just a resistor in series with the signal, like 33 ohms or so

11:46 <galibert[m]> so between the cable and the glasgow?

11:46 <Darius> yes

11:46 <galibert[m]> ok, thanks

11:46 <Darius> I mean you can try without, could work :)

11:47 <galibert[m]> well, I'm waiting on the glasgow :-)

12:18 <jn> someone recently mentioned that there are already some series resistors in a glasgow

12:18 <galibert[m]> nice

12:19 <jn> it was mentioned at the bottom of this blogpost https://colinoflynn.com/2024/04/dumping-parallel-nand-with-glasgow/

12:19 <jn> (but the blogpost also mentions that you might need *more* resistors)

12:25 <Darius> you want to match the impedance of the transmitter and receiver

12:26 <Darius> ish

12:26 <Darius> another option is RC termination

12:26 <Darius> the reason being you have fast edges and long wires, so you have a transmission line

12:27 <Darius> thats back in analogue land so you should be at home ;)

13:49 <theorbtwo[m]> Hmm, potentially dumb question time: I see there is already a tiny bit of LPC stuff in the Glasgow repo. Any thoughts on how hard it would be to do a "proper" LPC applet? Probably starting as a sniffer, or a logging port 80 bootup debug info display, but eventually growing into something you could prototype a peripheral on.

13:50 <whitequark[cis]> i have a wip applet

13:51 <whitequark[cis]> it required language and stdlib improvements that are still not fully done, since it has to run async

13:51 <whitequark[cis]> I want to finish it one day, I think

13:51 <whitequark[cis]> it can be well paired with HyperRAM

13:53 <theorbtwo[m]> (Heck, one could implement a sound blaster that way. One Glasgow port for LPC to connect to the PC, one to output PDM / i2s / SPDIF / whatever audio.)

13:56 <whitequark[cis]> yes

13:56 <whitequark[cis]> that is literally why i started building it, iirc

13:56 <whitequark[cis]> except i think jtopl may not fit into the ice40 we use

13:57 <theorbtwo[m]> Hm, that sounds both more complicated then expected and more complicated then I want to do. Is the effective bandwidth that high? I thought LPC was fairly slow, and low utilisation... Especially as I was thinking of doing simple filters on the FPGA for things like "only give me io ports below 0xff".

13:57 <whitequark[cis]> theorbtwo[m]: it runs at the same 33MHz as PCI

13:58 <whitequark[cis]> and it gives glasgow the clock

13:58 <whitequark[cis]> this is not easy to handle well

13:58 <whitequark[cis]> it's kind of similar to ethernet applet

13:59 <theorbtwo[m]> Ah, now I get you. Not the two parts being async I thought you meant.

14:00 <theorbtwo[m]> Is your WIP readable somewhere?

14:00 <whitequark[cis]> yeah

14:01 <whitequark[cis]> it should be in a branch in my fork

14:01 <whitequark[cis]> but its ancient and not working

14:03 <theorbtwo[m]> Cool. Will have a gander at that + the rgmii applet, to see if I can figure out what is going on and how to use the infra from the rgmii stuff for the lpc.

14:04 <theorbtwo[m]> *ponders a somewhat easier next target*

14:33 <jn> theorbtwo[m]: or a sound blaster emulator, even (stream the audio to the host for recording, livestreaming, whatever)

14:36 <jn> (eh, i slightly failed at reading what you wrote, but you get the gist, i hope)

15:34 <esden[cis]> Wanda: I am glad everything arrived. I was curious if you will find the "hidden treat" :D (I sent you both sizes I have, in case it will be useful in one way or another)