#garfield Logs

Oct 28 2022

12:04 AM rue_mohr: 6-20
12:17 AM rue_mohr: damn, the display controller is really burried in there
02:07 AM rue_mohr: NXP semiconductor, AN11160 which is entitled Designing RC snubbers
02:07 AM rue_mohr: http://electronicsbeliever.com/snubber-circuit-design-analysis/
02:19 PM miss0r2: Can anyone of you beautiful people in here help me with a good electronics supplier? I'm looking for a few ST M28F201-70K1, but it would seem they are not that easy to dig up, unless I want to send alot of money directly to china...
02:26 PM Tom_L: seems the case with a lot of chips these days
02:29 PM miss0r2: yup
02:29 PM miss0r2: it is not helped along by the fact that this is a dinosour
02:39 PM Tom_L: https://www.veswin.com/product-M28F201-70K1.html
02:39 PM Tom_L: says they have 50
02:40 PM miss0r2: I guess theres no way around getting a quote. I would've have just liked to press "place in basked" :)
02:41 PM Tom_L: https://www.alibaba.com/product-detail/original-Electronic-M28F201-70K1-Component_1600605815804.html
02:41 PM Tom_L: they have fake ones
02:41 PM Tom_L: 15 day lead
02:42 PM miss0r2: Are those fake?
02:42 PM Tom_L: i've no clue
02:43 PM miss0r2: I've looked at that site. But every time I add another $0.10 to the basket, it adds 20-40usd to the total
02:43 PM miss0r2: Not gonna pay *that much* :D
03:15 PM rue_mohr: none from aliexpress?
03:15 PM rue_mohr: how many do you need?
03:17 PM miss0r2: just a few.. 3-4 pieces
03:17 PM miss0r2: But I might have just read that I cannot use those particular ones. And I might be screwed...
03:17 PM rue_mohr: maybe you could tell more back story
03:18 PM rue_mohr: your going for a 32 bit state machine that takes up 8Mbits?
03:18 PM miss0r2: I'm replacing an Intel 28F002 TSOP40 chip with this PLCC32 (because the motherboard I am replacing the bios has the pads for the PLCC32 one.. AAAAnd I bricked the TSOP40)
03:18 PM rue_mohr: why not just get a 28F002 DIP?
03:19 PM miss0r2: Because that would mean alot of work to install that on the motherboard
03:19 PM miss0r2: I only have the pads for TSOP40 and PLCC32
03:19 PM rue_mohr: oh
03:19 PM miss0r2: the TSOP40 has 0.5mm spacing!!!
03:19 PM rue_mohr: mhm
03:19 PM miss0r2: I don't want to bodge wire that :D
03:20 PM miss0r2: but it would seem that A17, on the intel chips, are replaced with a #RP, effectively only allowing access to 1mbit of data
03:20 PM miss0r2: and the bios rom files I have found requires 2mbit
03:21 PM miss0r2: let me show you a photo why this dead motherboard makes me particularly sad: ...
03:23 PM miss0r2: https://imgur.com/a/DuLZ4Ii
03:23 PM rue_mohr: oh, give me the actaul link the image on imugr, they reject my web browser
03:25 PM miss0r2: https://i.imgur.com/WcVvRMT.jpg https://i.imgur.com/ya9ye7w.jpg
03:25 PM miss0r2: There are more. its my shrine PC :D
03:26 PM rue_mohr: huh
03:26 PM rue_mohr: so, what happened to the orig bios?
03:26 PM rue_mohr: do your not ok soldering the tssop?
03:27 PM miss0r2: I forced what turned out to be a bad bios onto it
03:27 PM rue_mohr: ah
03:28 PM rue_mohr: was there a reason you did the update or just becasue it was a newer file?
03:28 PM miss0r2: Because I have some disk limitations :)
03:28 PM rue_mohr: ah
03:28 PM rue_mohr: your running windows?
03:28 PM miss0r2: i.e. I wanted to be able to run an 8gb cf card, but it can only handle 4gb
03:29 PM rue_mohr: ?
03:30 PM miss0r2: bios bug
03:30 PM miss0r2: if the partition table does not correspond to something totalling 4gb or less, it hangs
03:30 PM miss0r2: I was trying to fix that with an update
03:30 PM rue_mohr: huh
03:31 PM rue_mohr: too old to have a backup bios I suppose, hmm
03:31 PM miss0r2: anyway. I've spend countless hours building this end of year 1997 beast, to compete with my little brother doing the same thing. Now I have a somewhat flashy paper weight on my hands :)
03:31 PM rue_mohr: I wonder how many of those tssops I have in my shop right now...
03:32 PM rue_mohr: can you solder a tssop if you can get one?
03:32 PM miss0r2: I don't want a new TSOP40 in there. I want to replace it with a socketed PLCC32, so I can experiment on it with my flash-programmer
03:32 PM rue_mohr: k
03:32 PM miss0r2: I *could* but I realy don't want to :)
03:32 PM miss0r2: also it needs to be an intel one
03:33 PM miss0r2: because of the #RP pin
03:33 PM rue_mohr: heh, castelated flex PCB adapter, hehe
03:33 PM miss0r2: hehehe
03:57 PM miss0r2: I might have to take you up on one of those TSOP40 packages
03:57 PM miss0r2: just to get it going if I can't figure out the plcc32 conversion
04:29 PM rue_mohr: I think I have a tssop adapter for my programmer
04:30 PM rue_mohr: if you wanted me to send a chip with something particular on it
04:39 PM miss0r2: I have a TSOP adaptor for my programmer as well.
04:39 PM miss0r2: but this phoenixBIOS stuff comes with a rom and a bin file called platform.bin
04:40 PM miss0r2: when you use the phlasher (the phoenix bios flasher software) it requires that both the platform.bin and the rom file is present. I have not yet figured out how to combine/convert the two into a raw image I can burn to the chip
04:45 PM miss0r2: Another possible issue (Damnit I don't know enough about this!) Is the #RP pin
04:45 PM miss0r2: and the Vpp
04:45 PM miss0r2: I've measured out all the connections between the TSOP40 and the PLCC32 pads.
04:46 PM miss0r2: I can see the #RP pin connects to some solder jumper positions from the TSOP40, and the A17 pin on the PLCC32 does the same, though they are not connected together.
04:47 PM miss0r2: the Vpp on the TSOP40 is not connected to the Vpp pin on the PLCC32
04:47 PM miss0r2: which is all good, as I am having a hard time sourcing a PLCC32 flash chip that takes 12 volts to enable write, as this TSOP40 here requires
04:49 PM miss0r2: anyway. Thats enough research for one night. See you
05:20 PM Tom_L: rue_mohr, does dude still have the drill?
07:17 PM rue_mohr: in the race to get to the building supply sote before they closed before I'd even had breadkfast I didn't have to chnce to phone and find out
07:17 PM rue_mohr: and no, I didn't mak it in time
07:17 PM rue_mohr: I should have given up on the day when I woke up
07:17 PM rue_mohr: just having brekfast now
08:26 PM Tom_itx: http://tom-itx.no-ip.biz:81/~webpage/rue/coupler/Coupler_brass2.jpg
08:26 PM Tom_itx: http://tom-itx.no-ip.biz:81/~webpage/rue/coupler/Coupler_brass3.jpg
08:26 PM Tom_itx: one didn't survive
09:30 PM Tom_itx is now known as Tom_L
10:38 PM rue_mohr: huh
10:38 PM rue_mohr: didn't take to the shave-off eh?
10:51 PM Tom_L: they tend to pop out and i wasn't quite ready for the first one