Notices by Tube🌞Time (tubetime@mastodon.social), page 11

https://webcache.googleusercontent.com/search?q=cache:AIUF3kbmvokJ:annex.retroarchive.org/cdrom/pier-05/036/INSINF/INSTALL.TXT says that i need to copy SF85E4X.BIO to both Install and Disk01. then add "SF85E4X.BIO" to the start of ABIOS.SYS (a text file) on both disks.

found this https://web.archive.org/web/20140912083725/https://ps-2.kev009.com/pcpartnerinfo/ctstips/252a.htm which says i need to copy some files over from the reference disk. hmmmmmm

i'm trying to install OS/2 2.0 on my Thinkpad 700C (16 floppy disks, wow) but i'm running into this weird error message. anyone recognize it?

...but this is umm less promising. "Trap D" is IBM-speak for "General Protection Fault"

WELL THIS IS PROMISING

this is hilarious: the xscreensaver called "bsod" (which i used to use as my screensaver many years ago) has an OS/2 2.0 fake BSOD with many of the same details! same trap address, same BIOS version. wild.

i have a funny feeling this is a problem with my DBA-ESDI emulator. also it appears to be corrupting sector writes, so i'll need to solve that problem.

I could just use a regular scanner, but this is a good excuse to try out this prototype Labsmore.com microscope that they loaned to me for free. (thanks guys!)

that's both sides. phew, lots of work! the next step is to photograph the top and bottom sides of the PCB. I really ought to get a scanner. 😅

I'm doing a more thorough reverse engineering of the power PCB from the Thinkpad 700 series. lots of work so far and there are still more parts to remove on the other side of the board!

hmm, that turned out pretty good!

i'm using Fiji/ImageJ to do the stitching. basically you go plugins->stitching->grid/collection stitching. then you pick "Filename defined by position" and then use c{xxx}_r{yyy}.jpg" for the file names parameter.

funny story, I've got two XYZ stages running at the same time in this house.

and here we are in Kicad 7 using the image overlay feature. it was pretty easy to get it going but the program slows down quite a bit for large images. you'll want to scale them down.

pro tip: add a scale factor in GIMP before exporting so Kicad gets the dimensions right.

vintage 1984 ad for 3 1/4" disks. no, not 3 1/2" -- these are slightly smaller.

although i like the aesthetics of this Panasonic floppy drive ad a little bit more.

Four Ways to Improve Your Memory.

a vintage 1985 TEAC ad for floppy disk drives.

I'm at the "blink an LED" stage of bringing it up.

I'm working on a new FPGA project. this one is rather complex.

ok so i unplugged the board and powered up the computer -- and the error stays. looks like i broke something. 😩