#garfield Logs

Jan 26 2023

09:15 AM aandrew: heh that sdram thing is interesting
09:40 AM ruenahcmohr: yep
09:40 AM ruenahcmohr: I'm trying to assemble the details so I can make a state machine
09:40 AM ruenahcmohr: which is a bit hit and miss
09:40 AM ruenahcmohr: might have to keep it to one page
09:40 AM ruenahcmohr: BUT
09:40 AM ruenahcmohr: I have a curiosity latley
09:41 AM ruenahcmohr: there was a comment when i was playing with the old DRAM chip that if I did't commit the page and reload it, I wasn't testing the memory cell
09:41 AM ruenahcmohr: which IMPLIES that the whole page is stored in static
09:41 AM ruenahcmohr: on an SDRAM card, that page is HUGE
09:41 AM ruenahcmohr: so, why not just use that page for static ram and ditch any worried about the refresh and stuff?
09:42 AM ruenahcmohr: s
10:14 AM aandrew: interesting...
04:19 PM polprog_: i got a 286 motherboard
04:19 PM polprog_: and a few ISA cards
04:28 PM ruenahcmohr: heh
04:29 PM ruenahcmohr: I ditched all the 286's less the fast one (12?MHz?)
04:30 PM polprog_: https://polprog.net/rozne1/ircjunk/computers/286mobo.jpg
04:34 PM ruenahcmohr: do you have ram for it?
04:35 PM ruenahcmohr: oh no, corroded pin..
04:35 PM ruenahcmohr: I wonder if I ahve an 80287
04:36 PM polprog_: probably have ram for it somewhere
04:36 PM ruenahcmohr: I think I have a huge bag of it
04:36 PM ruenahcmohr: might have some 4M sims
04:37 PM ruenahcmohr: I have some 41256 also, but I'm not sure if thats what the socketed is for or not
04:37 PM polprog_: do you have any chip cards?
04:38 PM ruenahcmohr: chip card?
04:38 PM ruenahcmohr: sims?
04:38 PM ruenahcmohr: or isa cards?
04:38 PM polprog_: smartcards
04:38 PM ruenahcmohr: oh, I think so
04:39 PM ruenahcmohr: their 8051 with a piffle amount of storage aren't they?
04:44 PM polprog_: they are a lot of different cpus
04:44 PM polprog_: and a lot of weird OSes
04:52 PM ruenahcmohr: huh
04:54 PM polprog_: so anyway i made a python script / module that talks to them
04:54 PM polprog_: you gotta read the standards before you canmake heads or tails from it
04:54 PM polprog_: 9600 baud
04:54 PM polprog_: serial interface
04:54 PM ruenahcmohr: ooo
04:55 PM ruenahcmohr: you never talk with us about what your up to
04:56 PM polprog_: heh
04:56 PM polprog_: well, recent stuff was mostly thesis
04:56 PM polprog_: i will translate it and upload it here probably
04:56 PM polprog_: i want to have it in english too
04:57 PM ruenahcmohr: so, they have a serial port in there?
04:57 PM polprog_: yes!
04:57 PM polprog_: i was trying to hack my student id
04:58 PM polprog_: its a chip card
04:58 PM polprog_: i actually managed to read the public file
04:58 PM polprog_: one of the 8 pins is IO, bidirectional serial port
04:58 PM polprog_: there is a lot of hardware for interfacing these with usb or com ports
04:58 PM polprog_: because they were used for pay tv
04:59 PM polprog_: and the hacking scene was huge back then
04:59 PM polprog_: I actually got my first reader from classifieds
05:00 PM polprog_: it was a serial programmer for the tv cards ("phoenix/funprog")
05:00 PM polprog_: two in one actually
05:00 PM polprog_: let me see if i have the pic
05:00 PM polprog_: oh and then I made my own programmer, for power draw analysis
05:00 PM polprog_: i was posting about it
05:06 PM polprog_: https://polprog.net/rozne1/ircjunk/various/iso7816/phoenix_funprog.jpg
05:06 PM polprog_: https://polprog.net/rozne1/ircjunk/various/iso7816/feedlistener.jpg
05:22 PM ruenahcmohr: if they have an 8051 and a serial port, I wonder if I can use them as controllers
05:23 PM ruenahcmohr: often if you can erase a card,they unlock the memeory
05:29 PM polprog_: i dont think so they are very locked down
05:32 PM ruenahcmohr: I been warming up to the idea of controllers that only have a serial connectrion
05:34 PM rue_shop3: also the idea of just using controllers to implement state machines
05:36 PM rue_shop3: mass io is an issue that keep comming up tho
08:41 PM aandrew: man I have not seen a 286 motherboard in a LOOOOONG time
08:49 PM aandrew: this is so cool. I have CT scans of a USB plug/receptacle (failure analysis) and being able to pan through the 3D environment in "layers" is just awesome
08:50 PM aandrew: 22GB of data and another 2GB for the viewer software
08:50 PM aandrew: if anyone's interested I'll share the data
09:02 PM rue_shop2: :]
09:02 PM rue_shop2: nothing scanned was ferrous?
09:02 PM rue_shop2: how does that work?
09:02 PM rue_shop2: so
09:02 PM rue_shop2: medical thing
09:02 PM rue_shop2: they have a crazy complex pcb
09:03 PM aandrew: I am not sure how it works. but the USB connector set definitely has both copper and iron in it
09:03 PM rue_shop2: they run a 12V pump, and a 24V solinoid
09:03 PM rue_shop2: so, they used a 24VCT transformer...
09:04 PM rue_shop2: they used a open-loop pwm regulator chip to pwm the motor off the rectified low voltage AC
09:04 PM rue_shop2: and to pulse the solinoid, they use a cd4060
09:10 PM aandrew: well that's certainly one way to do it
10:51 PM rue_shop3: my shop needs some kinda high capacity dust extractor
11:15 PM aandrew: I've seen a few box fan air purifiers
11:16 PM aandrew: everything from a single filter on the intake side of the fan to five MERV10s in a cube with the fan as the 6th side