deskthority

this protocol is relatively simple and fairly well documented, no snipping from me though, too many pages from http://bitsavers.org/pdf/ibm/5250_5251/SY31-0461-3_5251_Display_Station_Models_1_and_11_MIM_Jul79.pdf you should look at pages 65-92 (pdf pages not page numbers) the basic process seems to ...

Phpbb doesn't do personal data or tracking except your email address and anything you posted or pm-ed, i.e. your own content. You can review your email and download your pm's. You can also delete stuff or ask for account deletion. Since you have 29 posts/pm's total, this should be trivial. All the ...

thats cool, ive found some; let me know if these work, im planning on spinning up my own to do some data-sniffing around a system 32/34/36/38 i have occasional access to. here are my notes for the 5250 anyway: connector for panel mount connector Amphenol 082-5590-RFX cable ends use Amphenol 082-5589...

I noticed you have either a panel mount or a pcb mount twinax connector on your boards there, got any part numbers?

likely some more interesting information about the 5250 terminals will be found here http://bitsavers.org/pdf/ibm/system34/fe/SY-31-0458-6_IBM_System_34_Theory_Diagrams_Manual_Volume_2_198201/11_Work_Station_Attachment.pdf http://bitsavers.org/pdf/ibm/system34/fe/5340_Volume_D_ALD_sn0029238_Feb80.pdf

BTW, I would recommend a DAC with some faster bus. If you can reprogram it between scans, you can have per-column thresholds - which is not as good as per-cell, but close enough for practical purposes. yeah i wanted one originally but that would have driven the price up a bit, im still on the looko...

all hail evaporust!

kicad is still better than diptrace or FRAGGIN eagle. altium? well no mr moneybags its not, but at that price point literally nothing is good enough :D I'm new to all the helpful software but I'm going to bet on Fusion 360's January addition of Electronics: https://new.engineering.com/story/fusion-...

updates pushed, sans resistor and trace changes (would have pushed last week, but a lot of weird stuff has been happening) I need to resize for better and larger resistors, or baring that; switch to large smd resistors, not sure which would be more amenable to use. Ive also included the pull request...

on the note of atmega being single sourced: duh, but my point was that its possible to swap out the microcontroller for another, only making some modifications to the firmware. Oh, _that_. No difference there either. All the FPGA stuff can be pulled out and implemented using discrete logic and driv...

Id like to make the argument that the CommonSense controller does not use an "off the shelf" part. its a specific part that isnt made to by any other manufacturer, where as with the XWhatsIt design you can swap most of the parts around for other components, no particular reliance on a specific manu...

I will work on getting BOM CSV's spun up for digikey, mouser, arrow, and farnell later this week too

Ooh, this does look promising! Though admittedly CommonSense still has the advantage of off the shelf parts, even if it is a bit of a pain to configure. Id like to make the argument that the CommonSense controller does not use an "off the shelf" part. its a specific part that isnt made to by any ot...

contributions, and suggestions welcome! board is likely to go through *multiple* revisions, but thankfully its fairly modular. https://github.com/listofoptions/TH-XWhatsIt

May I ask a question about the PCB layout? What might be the purpose of the extra columns without holes in the loops, in between the columns which have holes in the loops where the ferrite beads attached to the keys pass through? Do these serve as reference loops against which the sensor loops are ...

forgot to upload stuff when i last cleaned the 129, need to get back to it, its been a bit since i posted anything at all. this is about a month ago now. so this is the underside of the 129 https://i.imgur.com/HxPXJum.jpg its pretty much identical to the 029, sans the bails and bail contacts https:/...

count me in! waht kind of unit cost are we looking at?

dammit i thought we got rid of those damned-able spammers finally

woops forgot to put the .jpg in the link otherwise what is mime encoding for right?

sorry to bump and old thread, but ive almost got the converter built, just need the time to finish it, and program it. in other news i know have a IBM 129! here's some images from the ebay listing! https://imgur.com/m34zTeG.jpg i have to admit the buttons and dials and toggle switches look pretty ho...

matt3o, would a fundraiser raffle for a specialty one-off artisan work? id be down for a raffle for a cap that would never get made again, specifically so we could keep funding this repository of work! something like 25-75 usd for 1 to 3 raffle tickets.

done

just make sure to be very careful in sanding that connector, you're only trying to break any oxide or light corrosion, if you see copper STOP!

no its almost certainly the edge connector. ive restored a handful of 5251's its usually the only place they can stop working, even with corroded looking pcbs. get some 1k grit or higher sandpaper, and use some isopropanol to gently sand the connector. since you've got it apart already clean the pcb...

looks like i need to finish my converter then kinda sad about that 029 sans its brain and body. please tell me you didnt get it removed from the rest of it!

Apparently, American beer is far worse than Canadian beer (at least that's what every Canadian says). Thankfully, I've never tried American beer. Yes, we didn't have anything good while we were in the US either :XD: . I don't think much of most German beers either; many are a bit bland for my taste...

I hate all big budget movies nowadays. Always the same shit story in different clothes, dumbed down for a global market. The last big budget movie master piece was probably Starship Troopers, and that was only possible because it was such a nasty hidden troll in a sci-fi flick. ... master piece? St...

abrahamstechnology wrote: ↑

07 Oct 2019, 19:15

Why don't we try using regular Model M flippers with capacitive foil attached to the bottom?

surface area mostly

you'd need a custom PCB made for any existing boards, due to the hall effect sensor. i guess they could have gone with a 2-wire hall effect sensor and integrated it into the switch, but that means reliance on one sensor, and engineering a custom frame to hold the sensor; engineering an assembly proc...

I'll have to give this a pass for now! super sorry i haven't responded in a while, work got stupid busy, etc... snacks go ahead if you want this!