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so i made a thing. a very big PCB with 4304 components. A 6502 microprocessor. http://tubetime.us/?p=346 pic.twitter.com/KWztWA3E9f
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i just realized that i forgot to test the write circuit. and it's all put away now. well, i'll just have to test it next time.
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aaaand we have data! this is a test disk, and it's just single sided.pic.twitter.com/QvRDIIuKJa
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the drive already has a logic board but it's this weird custom HP thing that has a proprietary disk interface. time for it to go.pic.twitter.com/ALGhNYD0V7
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typically these drives use a shorting block (the black thing with the jumpers you can cut) but im using a switch bank instead. H/T
@bitsavers for this trick.pic.twitter.com/bThcUCDj0r
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ooh, it's 35 configuration jumpers. this may take a while...
pic.twitter.com/iQvNyQKyZf
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better. the SA850 has around 20 configuration jumpers. time to check the manual and make sure they're all set right.pic.twitter.com/p5oDhQ3whm
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first though a bunch of these test points had snapped off, so i gotta swap those out for fresh ones.pic.twitter.com/esktLVjlol
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this afternoon's project: replacing the logic board in my Shugart SA850 8" floppy drive. this board i got from
@theretrowagon.pic.twitter.com/1enApFnuXG
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Tube Time Retweeted
BF862 - low-noise N-Channel JFET : weekend die-shot http://zeptobars.com/en/read/BF862-low-noise-N-Channel-JFET-J-FET-AM-preamp-2Ap … via
@Zeptobars#electronics#microscopypic.twitter.com/NmeJ5mtOOx
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here's the motorola datasheet, surprisingly still hosted on their website. https://www.motorolasolutions.com/content/dam/msi/docs/en-xw/static_files/Related_-_Vibrasender_and_Vibrasponder_devices.pdf …
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Tube Time Retweeted
This Commodore 1351 mouse for
#c64 used to work great. Now it doesn’t seem to move left. Time to take it apart.pic.twitter.com/9PtMF6q1b2
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nowadays radios generate the tones digitally instead of using an actual, physical resonator. you can pick a wide variety of frequencies and you don't have to swap out the tone reed modules.
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CTCSS works by sending a tone (like 192.8Hz) along with my voice whenever i TX and key up my mic. the RX side's squelch (aka mute, so you don't hear white noise when nobody is talking) will stay muted unless it also hears that exact tone.
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CTCSS=continuous tone-coded squelch system: let's say we have 10 radios (all on the same frequency) and we divide them into two groups using two different CTCSS tones. in my group i only hear my five buddies, and i cannot be heard by the other group.
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