#garfield Logs
Mar 25 2025
#garfield Calendar
06:49 AM rifraf: seen a cartesian printer work without belts or ball screws?
07:12 AM rifraf: another forgotten invention i made once https://www.youtube.com/watch?v=hN1LMJ9FPqY
07:12 AM rifraf: and now is bedtime already..
07:31 AM rue_mohr: ah I know that drive, I'm surprised it didn't drift tho
04:25 PM rifraf: onshape anyone?
06:10 PM rue_mohr: shapeways?
06:12 PM Tom_L: cloud cad app
07:51 PM rue_mohr: so, I'm on call for a week
08:38 PM aandrew: I gotta say LLM is making me look like a friggin genius python guy
08:39 PM aandrew: took me longer to regex the pulse pairs into a python array than it did to get a python program to spit out a visual representation of them: https://ibb.co/MkWXpymD
08:39 PM aandrew: I could have asked hte LLM to do that too but I didn't want to feel totally useless
08:56 PM rue_mohr: well, too deep and it gets things quite wrong
08:56 PM rue_mohr: knowing how to use it is a trick
08:57 PM rue_mohr: I just asked it to make a kicad part for me, and just spent.... an hour? using what it gave me as a base to completely rebuild my own
08:57 PM rue_mohr: I think I'v lost about 1k twitter followers, not surprised
08:58 PM aandrew: yeah I have no idea what my count is, I end up blocking porn bots at least a few times a week
08:59 PM rue_mohr: yea, you know, after the politics garbage, the porn bots dissapeared
09:05 PM rue_mohr: aandrew, did you see the invoice clipart?
09:06 PM rue_mohr: I'm not sure if 8 serial ports on one card is a good idea
09:06 PM rue_mohr: card for my z80 laptop
09:10 PM aandrew: rue_mohr: no?
09:11 PM rue_mohr: well the uart chip is a dual, so thats only 4 chips, but
09:11 PM rue_mohr: their parallel and the io and pin counts are stacking like crazy
09:11 PM rue_mohr: <rue_mohr> http://media.ruemohr.org/images/watermill.jpg
09:11 PM rue_mohr: <rue_mohr> or maybe http://media.ruemohr.org/images/watermill2.jpg
09:11 PM rue_mohr: I need an address decoder and a clock generator
09:12 PM rue_mohr: did I install the 8251 on my z80?
09:16 PM rue_mohr: I did, but I can probably re-use the loc for an NVRAM that I wanted
09:16 PM rue_mohr: (its wire-wrapped)
09:17 PM aandrew: I like the first one, I dont' think the gray actually helps make the name stand out
09:17 PM aandrew: very nice line art though
09:17 PM rue_mohr: yea, I dont think dialing back the contrast completely worked for me either
09:17 PM rue_mohr: and, I think the text needs to be on a circle anyhow
09:18 PM rue_mohr: I was looking thru an old book
09:18 PM aandrew: Mohr Mfg has a nice sound to it
09:18 PM rue_mohr: the company name goes on top, but they never put it over the art
09:18 PM rue_mohr: Mohr and co...
09:18 PM rue_mohr: co was my buddies
09:18 PM rue_mohr: company
09:18 PM rue_mohr: my company
09:18 PM rue_mohr: that I dont have anymore
09:18 PM rue_mohr: I'm alone
09:18 PM rue_mohr: no company.
09:19 PM rue_mohr: *sigh*
09:19 PM rue_mohr: I think the tape deck was easy pushing like 320cps
09:19 PM aandrew: I understand
09:19 PM aandrew: https://www.reddit.com/r/AskElectronics/comments/1jjnhed/old_timers_needed_working_with_old_schematics/
09:19 PM aandrew: might be up your alley
09:20 PM rue_mohr: the uart chip goes down to 50, so I should be ok
09:20 PM rue_mohr: haha
09:20 PM aandrew: I have some HDL that muxes like 8 UARTs into a single stream
09:20 PM rue_mohr: ouch
09:21 PM rue_mohr: I want to go lots of serial on the old z80 laptop
09:21 PM rue_mohr: the tape storage was already serial
09:21 PM rue_mohr: uh
09:21 PM rue_mohr: the keyboard and screen could be serial
09:21 PM rue_mohr: or external ports
09:22 PM rue_mohr: I want to put BASIC on it
09:22 PM rue_mohr: and I want to be able to direct INPUT and PRINT to different ports
09:22 PM rue_mohr: and I want a filesystem
09:22 PM rue_mohr: that I can load different programs with
09:22 PM rue_mohr: an SD card could work its way in there
09:32 PM aandrew: you could steal the posix concept of streams for that
09:33 PM aandrew: uart 0 = stdin/stdout/stderr and then be able ot "open" other ports to fprintf() to them
09:35 PM rue_mohr: meh
09:35 PM rue_mohr: PRINT #1, "Hello world"
09:36 PM rue_mohr: INPUT #4, s$
09:36 PM rue_mohr: $s ? ooo its been a while
09:38 PM rue_mohr: This is funny
09:38 PM rue_mohr: I replied to a bitcoin wallet add thing
09:38 PM rue_mohr: saying that 10 years ago I tried to put $100 of bitcoin into the wallet I had with company X, but couldn't work out how to get the coin to do it
09:38 PM rue_mohr: everyone is trying to help me
09:39 PM rue_mohr: I dont see the point of doing it NOW
09:40 PM aandrew: I want to play around with lua, I understand a lua interpreter can be very tiny
09:40 PM aandrew: still don't like basic much, ever did
09:40 PM rue_mohr: well
09:41 PM rue_mohr: I was thinking, if I could put a few BASIC programs on the z80 and have one of them a startup program, it could be a menu to run other programs
09:41 PM rue_mohr: I could have programs like assemblers
09:41 PM rue_mohr: or tetris...
09:42 PM rue_mohr: anyhow, there could be the onboard NVRAM programs and the SD card programs
09:42 PM rue_mohr: so, yea, I'm getting deep into filesystem stuff kinda quick
09:43 PM rue_mohr: fffff I hate google autocomplete
09:43 PM rue_mohr: if I dont confirm the complete then NO!
09:44 PM Tom_L: my new phone tries to think for me
09:44 PM Tom_L: 'assistant' my ass
09:44 PM rue_mohr: yea, spend all your time correcting it
09:44 PM Tom_L: for finding ways to shut things down
09:50 PM aandrew: there are lots of fat/vfat implementations you could use, there's little to no use in writing yet another one
09:51 PM rue_mohr: indeed
09:52 PM Tom_L: write a sd read/writer
09:52 PM rue_mohr: it would be nice to have something that worked in cramped spaces like NVRAM too tho
09:53 PM aandrew: I wrote an interesting "filesystem" -- it's really just a key/value store but it's completely backing store agnostic and implements a kind of cheap write levelling and offers encryption too
09:54 PM rue_mohr: I dont suspect I'd be worried about wear leveling with an SD or nvram
09:54 PM Tom_L: can't find my pdfs on the topic now
09:55 PM Tom_L: started with mmc
09:55 PM aandrew: https://markdownpastebin.com/?id=1ddefb4cf488433c93235a493646324b
09:55 PM aandrew: yeah this wouldn't be useful for a filesystem per se, like I said it's mainly meant as a key/value store
09:56 PM aandrew: simple SPI protocol sd driver's pretty straightforward, that's something they did well
09:56 PM Tom_L: http://tom-itx.no-ip.biz:443/~webpage/pdf/mmc/
09:56 PM aandrew: when you start getting into 2/4 bit modes and high speed modes it gets a little hairier with voltage lvel switching and such
09:57 PM rue_mohr: I cant imagine how long it would take to fill 1G with a z80
09:57 PM rue_mohr: normal use
09:57 PM aandrew: heh
09:57 PM aandrew: yeah it's a little insane how much space you have fast, cheap access to
09:57 PM rue_mohr: SSD with PATA adapter?
09:58 PM Tom_L: got one
09:58 PM rue_mohr: :] IO mode
09:58 PM aandrew: I've seen compact flash floppy drive emulators
09:58 PM rue_mohr: yep
09:58 PM rue_mohr: there is just CF too
09:59 PM rue_mohr: nope, my digging didn't find anything on the logic symbols, tho I would swear they look familiar
09:59 PM Tom_L: http://tom-itx.no-ip.biz:443/~webpage/logger/SD_breadboard1.jpg
09:59 PM aandrew: wow
09:59 PM aandrew: I am disappoint, son
09:59 PM aandrew: I was sure you'd have that info memorized :-)
09:59 PM rue_mohr: Tom_L, I have an atmega32 datalogger pcb you did
09:59 PM rue_mohr: but I dont think you ever got it working
09:59 PM Tom_L: no
10:00 PM rue_mohr: there is arduino now
10:00 PM rue_mohr: hardware and code for cheap
10:00 PM Tom_L: http://tom-itx.no-ip.biz:443/~webpage/logger/Logger1.jpg
10:00 PM Tom_L: that's cheating though
10:00 PM rue_mohr: yep, cheating is in
10:00 PM Tom_L: 2006
10:00 PM rue_mohr: did you get the SD working tho
10:01 PM rue_mohr: I remember everyone having issues with cards
10:01 PM Tom_L: i don't think so
10:01 PM Tom_L: proprietary stuff
10:01 PM Tom_L: mmc maybe
10:01 PM rue_mohr: yar
10:01 PM Tom_L: it was open
10:01 PM rue_mohr: aandrew, I even tried google image search
10:01 PM aandrew: google image search for what
10:02 PM Tom_L: is that the same as lens?
10:02 PM rue_mohr: lens?
10:02 PM rue_mohr: http://media.ruemohr.org/images/p1340145.jpg
10:03 PM Tom_L: https://lens.google/
10:03 PM rue_mohr: I think that is basically google image search
10:04 PM Tom_L: except you take your own image
10:04 PM rue_mohr: PC
10:04 PM Tom_L: phone
10:04 PM rue_mohr: PC!
10:04 PM Tom_L: PHONE!
10:05 PM Tom_L: silly me was trying to figure out a way to compile a deb for rpi on the android os
10:05 PM Tom_L: kept me busy for an evening then i gave up on the idea
10:06 PM aandrew: wow, perplexity found the reddit article I sent you from our photo and told me it's NAND (AND + shading)
10:07 PM aandrew: tineye didn't find anything
10:08 PM rue_mohr: hmm
10:08 PM rue_mohr: wonder how it knew that
10:09 PM rue_mohr: so, give it one with the dot, which I think is nor
10:09 PM aandrew: it knows that because that was one of the comments on the post
10:09 PM rue_mohr: oh, the comments seem to be wrong/sus
10:09 PM aandrew: https://www.reddit.com/r/AskElectronics/comments/1jjnhed/old_timers_needed_working_with_old_schematics/mjoile0/
10:10 PM rue_mohr: I noticed that chatgpt goes to reddit as one of its main sources
10:10 PM rue_mohr: the comment about using it as a not gate is great, but better ground would be good
10:10 PM Tom_L: weren't those and gates?
10:11 PM Tom_L: what was it with a dot on the output? invert?
10:11 PM Tom_L: i don't see one there
10:11 PM aandrew: well it's saying it's the shape of AND but the shading is oldschool for inversion (modern day bubble on output) -- but that's from reddit too
10:12 PM rue_mohr: in that schematic, the shape just mean 'gate'
10:12 PM rue_mohr: The pin count for this serial module is a bit crazy
10:13 PM rue_mohr: 8 serial ports, so rxd and txd alone are 16 pins
10:13 PM rue_mohr: parallel interface, with 8 data bits, 6 address lines, r/w
10:13 PM rue_mohr: and power
10:14 PM rue_mohr: it seems like this chip can do synchronous too
10:14 PM rue_mohr: and it looks like you can use the timer to do things, and its got generic IO
10:15 PM rue_mohr: maybe I should just point 4 pins down for mounting and wire-wrap directly to the rest
10:15 PM rue_mohr: then I could do a crazy 4 sided or double row'd thing
10:15 PM rue_mohr: but that means there would be no pluggability
10:15 PM rue_mohr: not sure if that matters
10:16 PM aandrew: oh man I've seen some of those weird dual-row-per-side DIP type of chips
10:16 PM rue_mohr: as a 'module' this thing will be crazy
10:19 PM rue_mohr: hmm
10:19 PM rue_mohr: actually, compared to a header these are small
10:19 PM rue_mohr: oh, 40 isn't 20
10:20 PM rue_mohr: 80 pin module?
10:21 PM rue_mohr: 1"x8"?
10:21 PM rue_mohr: oh wait, there is a back side
10:21 PM rue_mohr: how many pins do I need here...
10:22 PM rue_mohr: 2+8+6+2+16+
10:22 PM rue_mohr: ...
10:22 PM rue_mohr: do I need handshaking?
10:22 PM rue_mohr: I do want to use the gpio for the tape deck control
10:23 PM rue_mohr: should I break out all the gpio?
10:23 PM rue_mohr: thats
10:23 PM rue_mohr: 8*4 + 7*4 = 60
10:23 PM rue_mohr: + the other 34
10:24 PM rue_mohr: at 94 pins there
10:24 PM rue_mohr: roll back a bit rue
10:24 PM rue_mohr: so, the tape deck is serial
10:25 PM rue_mohr: and you definitly want, say 2 general use serial ports
10:25 PM rue_mohr: so thats 3
10:25 PM rue_mohr: these cant do the SD cards, but you DO like to make things serial
10:25 PM rue_mohr: lets say 1 for keyboard/screen, thats 4
10:26 PM rue_mohr: ...could use two more for stereo 1 bit audio
10:26 PM rue_mohr: hahah
10:26 PM rue_mohr: but I think 6 ports is reasonable
10:27 PM rue_mohr: 2+8+6+2+12+
10:27 PM rue_mohr: 2+8+6+2+12+(8*3)+(7*3)
10:27 PM rue_mohr: 75 ins
10:27 PM rue_mohr: 75 pins
10:27 PM rue_mohr: which is under 80 pins
10:28 PM rue_mohr: AND I'm going to have to get at least 3 cards made anyhow
10:30 PM rue_mohr: ok 3 chips
10:30 PM rue_mohr: wait how am I supposed to do chip select for that then
10:30 PM rue_mohr: well you have 5 pins left over
10:31 PM rue_mohr: what can I use with 8 bits and 5 pins
10:31 PM rue_mohr: well, adc/dac
10:31 PM rue_mohr: your sort of breaking the 'serial module' model then aren't ya?
10:32 PM rue_mohr: ok, how about some sort of synchronous chip
10:32 PM rue_mohr: ah, because they cant do real synchronous anyhow
10:33 PM rue_mohr: something not quite bit-banged for i2c
10:33 PM rue_mohr: yea, we need i2c!
10:33 PM rue_mohr: it fits the 'serial' bill
10:33 PM rue_mohr: 5 pins could be 2 i2c busses
10:35 PM rue_mohr: so can we use the 74299 chips for that...
10:35 PM rue_mohr: combined with 16V8...
10:44 PM rue_mohr: dude, your making designing a current controlled 5 phase stepper motor driver look like a walk in the park
10:50 PM aandrew: what've you got with 75 pins?
10:50 PM rue_mohr: 80 pins, two header strips
10:50 PM aandrew: ah
10:50 PM rue_mohr: the laptop is wire-wrapped
10:50 PM rue_mohr: so, I need to keep the board friendly to that
10:52 PM rue_mohr: I'm not sure if a 4" long module is a good idea tho
10:53 PM rue_mohr: I think I can keep it about 1" narrow
10:54 PM rue_mohr: the baseboard of I used is vero strip
10:54 PM rue_mohr: so you break the traces that go lengthwise down the board
10:55 PM rue_mohr: its going to take me ages just to do in all the connections on this thing
10:56 PM rue_mohr: I dont really want to wire-wrap directly to this board, but if I did, I could save lots of space, but putting pins on all 4 sides
10:56 PM rue_mohr: or even doubling them up
10:57 PM rue_mohr: 0.7" is minimum width...
10:59 PM aandrew: yeah you have a lot of wiring and all 5V is gonna be a little noisy
10:59 PM aandrew: planning on using any series resistance to limit drive strength?
10:59 PM rue_mohr: ha
10:59 PM rue_mohr: na
11:00 PM rue_mohr: I had _0_ decoupling caps in this thing when i first made it
11:00 PM rue_mohr: the first time I had a problem was the tape drive not workin
11:00 PM rue_mohr: there was like 0.2V noise on the power rails
11:01 PM rue_mohr: shshshshshshshshsh
11:01 PM rue_mohr: the head amp said no
11:01 PM rue_mohr: I'v not tried to re-install it with the bypasses in
11:02 PM rue_mohr: I was able to get about 160+ chars/sec from that tape drive
11:02 PM rue_mohr: I was thrilled
11:02 PM rue_mohr: minicasette
11:02 PM aandrew: that's awesome
11:02 PM rue_mohr: mechanized, no buttons to hit
11:02 PM aandrew: I should try to find an old microcassette and wire up something oldschool
11:02 PM rue_mohr: from like an asnwering machine or someting
11:03 PM aandrew: wonder what you could get from an old tape like that with some signal processing
11:04 PM rue_mohr: heh
11:04 PM rue_mohr: a few bands of FM?
11:05 PM rue_mohr: there is nothing to worry about being compatible with :]
11:05 PM aandrew: yeah nothing too fancy, but definitely some FEC on top of something that could use more of the available bandwidth
11:05 PM aandrew: that's very true
11:05 PM rue_mohr: a stack of fsk modulators
11:06 PM rue_mohr: heh, record in 8 bits
11:06 PM rue_mohr: with a clock channel
11:06 PM aandrew: wow those things are stupid expensive on amazon, wonder what's on ebay/craigslist
11:06 PM rue_mohr: FFT the data out of it
11:06 PM rue_mohr: what things?
11:06 PM aandrew: microcassette recorders
11:06 PM rue_mohr: ?!?!?
11:07 PM rue_mohr: thriftsotre?
11:07 PM aandrew: yeah I've actually never gone to a goodwill/salvation army down here yet
11:08 PM rue_mohr: it doesn't seem too american
11:08 PM rue_mohr: "YOU CANT HAVE MY GARBAGE NOMATTER WHAT YOU WANNA PAY, NOW GET OUT OF HERE BEFORE I DECIDE TO SHOOT YOU CAUSE I FEEL LIKE IT"
11:08 PM rue_mohr: is the general american vibe I get, maybe thats more alabama
11:09 PM aandrew: my experience has been that americans are very very very very similar to canadians
11:09 PM aandrew: don't buy into the dumb stereotypes
11:09 PM rue_mohr: except the guns
11:10 PM rue_mohr: and the "I wont give a red cent to help another person' attitude?
11:10 PM aandrew: again, don't buy into the dumb stereotypes
11:10 PM rue_mohr: aka, nobody wants to pay into a healthcare program that gives money to others who cant afford it themselves
11:10 PM aandrew: every american I've spent more than 10 minutes with has been awesome
11:10 PM rue_mohr: mmm
11:11 PM aandrew: yeah ebay has way saner prices
11:11 PM aandrew: https://www.ebay.com/itm/226656478725
11:12 PM aandrew: doubt I'd find cheaper at goodwill unless I got lucky
11:13 PM rue_mohr: https://www.ebay.com/itm/396338685141
11:13 PM rue_mohr: automated mechaism...
11:13 PM aandrew: yep that's where I'm looking now, I don't want to have to goof around with motors and servos to try to operate it
11:13 PM rue_mohr: ebay.com/itm/176849371592
11:13 PM rue_mohr: some of them used looped tapes tho
11:13 PM rue_mohr: so no rewind, etc
11:14 PM aandrew: yeah my dad had one of those
11:14 PM aandrew: kind of like bubble memory... missed your data, loop around
11:15 PM rue_mohr: that first one I posted, I have one
11:16 PM rue_mohr: some of them just put a tone on the tape to find their way
11:16 PM rue_mohr: ebay.com/itm/306073090485
11:17 PM rue_mohr: not sure what types these 1-tape units are
11:17 PM rue_mohr: Tom_L,
11:17 PM rue_mohr: do you have a microcasette answering machine gathering dust?
11:17 PM rue_mohr: oh yea
11:18 PM rue_mohr: ebay.com/itm/116498232464
11:18 PM rue_mohr: there ya go
11:18 PM rue_mohr: dual cassette
11:18 PM rue_mohr: oh, maybe not mini
11:18 PM rue_mohr: oh, not mini, srry
11:18 PM aandrew: heh
11:19 PM aandrew: condition: used. "probably works" :-)
11:19 PM rue_mohr: ebay.com/itm/266855796588 <-- wow, had one of those in the house as a kid, I remember that so well
11:19 PM aandrew: hah I remember those
11:19 PM aandrew: didn't have one but do remember them
11:20 PM rue_mohr: https://www.ebay.com/itm/156772671959
11:20 PM rue_mohr: hey, thats not a looped tape!
11:20 PM aandrew: https://www.ebay.com/itm/276809769991
11:20 PM aandrew: there's a dual
11:21 PM aandrew: and yeah the rewind button gives away that it's not looped I think
11:21 PM aandrew: that one is even "local" to me, la jolla isn't that (close to san diego)
11:21 PM rue_mohr: the OGM might be looped
11:22 PM aandrew: heh it just occured to me that you could use the dual ones for a bootloader and main program :-)
11:23 PM rue_mohr: heh
11:23 PM rue_mohr: I hear hondouras is a bit rough right now, I hope tom will be ok
11:24 PM rue_mohr: SO
11:25 PM aandrew: yeah I am a little nervous anywhere in south america
11:25 PM rue_mohr: so I give 1 chips a crystal and then chain the clock thru the other chips?
11:25 PM rue_mohr: or do I use a module and fork the clock out to all 3
11:26 PM aandrew: for a z80 I doubt it matters
11:26 PM rue_mohr: and I hear the cartels really have their noses out of joint about trumps actions
11:27 PM rue_mohr: its the 3.6MHz for the uarts
11:27 PM aandrew: when I made that 5 camera measurement thing I fed the main clock through a pair of clock drivers because I could adjust the phase and delay of each output independently
11:27 PM rue_mohr: I can put a crystal on one chip, then run the 'out' from it to the 'in' of the next, and its 'out' to the next 'in'
11:28 PM rue_mohr: hmm
11:30 PM rue_mohr: I dont think I need hardware handshake on any of the ports
11:30 PM aandrew: that radio shack one you linked first is the best bang for buck I think. free shipping and $15
11:30 PM rue_mohr: whats neat, is that these chips will actually handle the handshaking stuff for you
11:31 PM rue_mohr: the 8250 just sets/clears flags in a reg, its operation is not tied to the handshaking lines
11:31 PM rue_mohr: if its a 1 tape, make sure its not a looper
11:31 PM rue_mohr: (I dont know which one you mean)
11:31 PM rue_mohr: I'd offer to send you a mechanism, but I dont have any more good ones
11:32 PM rue_mohr: oh, duties
11:32 PM rue_mohr: dont try to bring anything into canada
11:32 PM rue_mohr: the border is a mess
11:33 PM aandrew: https://www.ebay.com/itm/306073090485
11:33 PM aandrew: that one
11:33 PM rue_mohr: oh yea, there is a rewind button
11:34 PM rue_mohr: hahah
11:34 PM rue_mohr: you know, if you can find the manual for it...
11:34 PM rue_mohr: there MIGHT be a schematic...
11:37 PM aandrew: well I bought it... I have no time for it but why not
11:37 PM rue_mohr: :/ I think its too late a manual to have a schematic
11:37 PM rue_mohr: er, model
11:38 PM aandrew: that's fine, I will probably end up gutting it anyway
11:38 PM rue_mohr: the preamp and IO interface/drivers could be handy
11:38 PM rue_mohr: heh, could be an 8051
11:39 PM aandrew: if there's an 8051 in there I'll send it to you
11:39 PM rue_mohr: oh, its almost bedtime
11:39 PM rue_mohr: haha
11:39 PM rue_mohr: I'll make it do FFTs
11:40 PM rue_mohr: for 9 channel FSK demodulation
11:40 PM rue_mohr: just 20 bins!
11:41 PM rue_mohr: suppose ya end up with 32
11:41 PM rue_mohr: meh
11:41 PM rue_mohr: put the center freq of each channel on the border of the bins
11:41 PM aandrew: lol
11:41 PM aandrew: https://www.ebay.com/itm/316084720593
11:41 PM aandrew: I can pay another $13 for the manual
11:42 PM aandrew: oh plus another $10 to ship
11:42 PM aandrew: lol
11:42 PM rue_mohr: I dont think it has the schematics
11:42 PM rue_mohr: I think its too new
11:42 PM aandrew: no it doesn't
11:43 PM rue_mohr: I wonder what the bandwidth is
11:43 PM aandrew: https://ibb.co/sJmzP5S3
11:44 PM rue_mohr: 10-8000 I'd expect
11:44 PM aandrew: yeah it'll be liited
11:44 PM aandrew: limited
11:44 PM aandrew: and if it is slowing down to get more time on the tapes then even lower
11:44 PM rue_mohr: that should be enough for 9 bands
11:45 PM aandrew: https://ibb.co/Fkk8PWbH wow used to be $200
11:46 PM rue_mohr: well look at the feature list!
11:46 PM rue_mohr: oh I better go to bed
11:46 PM rue_mohr: damn, the pasta is gonna reflux me all night
11:47 PM rue_mohr: I'm on call, might have to drive to work at 1am anyhow
11:48 PM rue_mohr: the XR88C192 has some awesome features
11:48 PM aandrew: damn, no hits on the fcc id
11:49 PM rue_mohr: for a schematic?
11:49 PM aandrew: no internal view
11:49 PM aandrew: why would you get a dedicated uart chip
11:49 PM aandrew: I have working VHDL you can throw into practically anything
11:49 PM rue_mohr: no I have them
11:49 PM rue_mohr: I have a bin of them from e-waste
11:50 PM rue_mohr: I dont think I could fit a good uart in a 9572
11:50 PM aandrew: https://pastebin.com/Kj8C3hR3
11:50 PM aandrew: what did you pull them out of
11:50 PM aandrew: that's kind of an esoteric chip
11:50 PM rue_mohr: medical e-waste
11:51 PM rue_mohr: the iv dosing things
11:51 PM rue_mohr: had 2 8051 and a 80188 in them
11:51 PM aandrew: interesting
11:51 PM aandrew: ok well you best get to bed, I have to go too
11:51 PM aandrew: had a kind of shit day
11:51 PM aandrew: eager to put it behind me
11:51 PM rue_mohr: and a 16 bit ADC, and a 8 bit DAC, and some of those fancy led die displays with ascii decoding
11:51 PM rue_mohr: oh yea, bed
11:51 PM aandrew: tomorrow won't be all that much better but one foot in front of the other
11:52 PM rue_mohr: freaking reflux
11:52 PM rue_mohr: hey, ...
11:52 PM rue_mohr: I redid that 7 segment pcb with the CH32 serial decoder
11:52 PM rue_mohr: I think I want to send it off for pcba
11:52 PM rue_mohr: so I might try that again
11:52 PM rue_mohr: gnight
11:56 PM rue_mohr: oops
11:56 PM rue_mohr: prolly shouldn't take melatonin when I'm on call...
11:56 PM rue_mohr: hmm, too late
11:57 PM rue_mohr: yea, that looks like lots more than 72 macrocells