#garfield Logs

Oct 14 2020

09:14 AM rue_mohr: polprog, can you see how that 7 segment decoder works?
09:25 AM rue_mohr: no, the charlie doesn't work
09:26 AM rue_mohr: this is scanned, like the charlie
09:26 AM rue_mohr: but the scanning is fixed
09:26 AM rue_mohr: the counter and 74--138 scann thru all the segments
09:26 AM rue_mohr: and the ROM determines when the digit is enabled
09:26 AM rue_mohr: based on the current segment being scanned, and the input value
09:27 AM rue_mohr: it can do that for multiple digits at once, as it only requires 1 output line per digit
09:28 AM rue_mohr: "If the input value is A and the current segment is G, enable the display"
09:28 AM rue_mohr: 0x0A
09:28 AM rue_mohr: but in that example 4 bit, so 0xA
04:06 PM polprog: ah, nice
04:06 PM polprog: clever
04:15 PM polprog: i cant wait to set up the tools for that hcs12 mcu
04:15 PM polprog: even if i make a led blink that will be a huge thing
04:16 PM polprog: DOS on the compaq pc didnt work out, mostly due to the crt iwas planning to use being non stop broken
04:16 PM polprog: but i have this ibm 600x laptop that has a sata ssd fitted, i could get another cheap ssd and slap win 98 or XP on that to have the tools
04:16 PM polprog: its got paralell and serial port so its ideal for dev
04:21 PM aandrew: http://arstech.com/install/ecom-prodshow/usb2isax3.html
04:22 PM aandrew: Looks like a standard FX2LP
04:26 PM polprog: hmm, isnt that what they make saelae clones on ?
04:26 PM polprog: also
04:26 PM polprog: https://twitter.com/Manawyrm/status/1316416401171722240
04:30 PM aandrew: Hah, found another: https://github.com/Manawyrm/ISASTM/blob/master/README.md
04:30 PM aandrew: polprog: yes
04:30 PM polprog: ;)
04:30 PM polprog: doing some physics, gotta catch up
04:30 PM polprog: im so tired
04:30 PM aandrew: Me too
04:30 PM polprog: and bad some bad days recently
04:30 PM polprog: had some*
04:30 PM aandrew: Tired, not physics. And bad days as well
04:31 PM aandrew: They’re the cause of the tired
04:31 PM polprog: yeah
08:54 PM rue_mohr: 6502 thing has some appeal
08:55 PM rue_mohr: I think cause its easy
08:55 PM rue_mohr: simple and easy
08:55 PM rue_mohr: it looks like I can go pretty far with a 3 chip setup
08:55 PM rue_mohr: I suppose I'll need a 3rd chip for the keyboard
08:56 PM rue_mohr: wonder if I have any 544
08:56 PM rue_mohr: 4x5 keys...
08:57 PM rue_mohr: 2 bits and 3 bits
08:57 PM rue_mohr: so 5 bits
08:57 PM rue_mohr: +1 for keydown
08:57 PM rue_mohr: I guess I could add a control and shift, call it 8 bits
08:58 PM rue_mohr: I should go do a bit more school stuff
09:03 PM Tom_L: more likely to pay the bills ehh?
09:44 PM rue_mohr: ok, I'm ok
09:47 PM Tom_L: were you worried?
09:48 PM Tom_L: such an uneventful night
09:55 PM rue_mohr: well
09:55 PM rue_mohr: they got me on a few questions
09:55 PM rue_mohr: like I forgot completely what RG11 was
09:55 PM rue_mohr: (its the BIG ASS STUFF)
09:56 PM rue_mohr: like, for entry into large buildings
10:12 PM rue_mohr: so I been playing with a few things
10:12 PM rue_mohr: multithreading
10:12 PM rue_mohr: http://ruemohr.org/~ircjunk/tempimage/p1170636.jpg
10:12 PM rue_mohr: http://ruemohr.org/~ircjunk/tempimage/p1170638.jpg
10:12 PM rue_mohr: http://ruemohr.org/~ircjunk/tempimage/p1170640.jpg
10:12 PM rue_mohr: http://ruemohr.org/~ircjunk/tempimage/p1170645.jpg
10:12 PM rue_mohr: http://ruemohr.org/~ircjunk/tempimage/p1170663.jpg
10:13 PM rue_mohr: http://ruemohr.org/~ircjunk/tempimage/p1170670.jpg
10:13 PM rue_mohr: http://ruemohr.org/~ircjunk/tempimage/p1170681.jpg
10:13 PM rue_mohr: http://ruemohr.org/~ircjunk/tempimage/p1170682.jpg
10:13 PM rue_mohr: http://ruemohr.org/~ircjunk/tempimage/p1170687.jpg
10:13 PM rue_mohr: 36 installed new tstat in fridge, its not working, I think I have to reinstall it
10:14 PM rue_mohr: not lots of forward motion on the pillars, the last rock I set in has come loose for the second time, at these temps the mortar is just not setting up much at all
10:14 PM rue_mohr: ^^ 38
10:14 PM rue_mohr: 45, debounce, thats the "ultimate debounce" or so I think currently
10:15 PM rue_mohr: 63 I made a capacitor SIP for the debounce on the power supply I'm doing up
10:15 PM rue_mohr: 70, I think I'v figured out the ultimate 7 segment decoder circuit thats kinda discrete
10:16 PM rue_mohr: logicy
10:16 PM rue_mohr: 81, I snagged a 6502 distraction, I tested the address decoder (74ls139) and its working great
10:16 PM rue_mohr: 82, roll eyes...
10:17 PM rue_mohr: 87 I have all the main components worked out for the digital part of the power supply, need to start a protoboard for them