it's another electronics flea market here in silicon valley! slightly rainy today.
a box full of 8-bit ISA RAM cards! I picked up a few for a uhh project
missing keys
tuuuuuuube
oooh a 9825!
nixie tubes in this instrument
piles of old ISA cards.
amplitude modulation monitor, GR-branded.
ohhhh a math coprocessor for your XT! new in box.
panic button
tube tester. it also does transistors!
@tubetime but that does it do when you push it?
@RebelbotJen @tubetime it sends a stop note midi message on all channels (and maybe all notes on all channels, can't remember). midi is so flaky if you go too fast some synths just can't process the messages in time so notes can hang on forever.
@miunau @RebelbotJen @tubetime It should send MIDI All Sound Off (CC 120), not All Notes Off (CC 123), because the latter will maintain note release time, and notes held by sustain will not turn off until the sustain pedal is depressed.
@tubetime Is that to turn off all MIDI channels by sending off messages to each one?
@raek @tubetime As I understand it the system sends an All Notes Off message on all MIDI 16 channels per MIDI stream.
@tubetime PANIC! At the MIDI Machine
@tubetime A Panic button is essential functionality for every MIDI device. Also conveniently placed right next to the power button. This checks all boxes.
@tubetime Oof! This panic button is dangerously close to the power switch. As a testimony to the robustness of the midi protocol (ahem), the need for such a button is VERY real in live settings. Simply disconnecting cables or powering off won't do.
@tubetime man, I could use one of those!
@tubetime I think I installed one of these in a Packard Bell decades ago...
@tubetime I wanted a math coprocessor for my 486SX so badly only because the boot screen would indicate its absence every time I turned on my computer, even though I didn’t really understand what it did 😆
@tubetime Can I install that in my Apple silicon Mac and get back FLOAT80 support? 🤔
@tubetime OMG the gearmotors! 😍
@tubetime I had an 8086 board for my CP/M machine, a NorthStar Advantage. It ran DOS 2.0, which could be configured to use forward slashes in paths. Eventually I got an 8087 daughter board for this machine. It was fun while it lasted.

@tubetime That Quadro and WinTV card are offended. ;)

This must mean I’m also old if I’ve had several of these and can spot the sound blaster clones.

@fuchsiii @tubetime jealous...

I mean, Dalibór Farný is making new ones but they're like € 200+ a piece...

Tho admittedly those are 125x50mm chonkers!
https://www.daliborfarny.com/project/rz568m-nixie-tube/

R|Z568M Nixie Tube

@tubetime I have one of these!
@tubetime Damn! Good thing I slept in as I have no use & space for this hp9825 but would have grabbed it regardless

@tubetime curious marc has a great series on repairing a 9825T

really neat deep dive in to it

(spoiler alert they get it working)

https://www.youtube.com/watch?v=b-eN93L6yX8

HP 9825T Repair Part 1: Power Supply Meltdown

YouTube
@rdp yep. hmm, the 9845 with the power supply overvoltage was quite tricky to fix.
@tubetime the yellow box could also be interesting..
@tubetime I like big tubes, and I cannot deny.