#garfield Logs

Apr 22 2021

04:16 PM Tom_L: kindof mean looking http://tom-itx.no-ip.biz:81/~webpage/cnc/cutters/Carbide_rougher2.jpg
04:23 PM Tom_L: http://tom-itx.no-ip.biz:81/~webpage/cnc/cutters/Carbide_rougher1.jpg
04:23 PM aandrew: yeah I bet that'd take some skin off even when not spinning
07:13 PM rue_mohr: hello
07:13 PM rue_mohr: it arrived
07:31 PM aandrew: "it" ?
07:31 PM rue_mohr: the roughing bit tom got
07:31 PM rue_mohr: so, this z80 lockup
07:32 PM rue_mohr: nobody else can get it to happen, but nobody has chips as dated as mine
07:39 PM aandrew: is this an errata before a certain chip rev?
07:52 PM aandrew: rue_mohr: did you see this? I don't htink it has anything to do with your issue but is an interesting bit of info to squirrel away: https://www.reddit.com/r/Z80/comments/kf1zc7/bus_request_handling_coming_out_of_reset/
08:13 PM rue_mohr: this is not intermittent
08:13 PM rue_mohr: this is 100% repeatable
08:17 PM Tom_L: then you should be able to fix it
09:10 PM aandrew: well like I said I didn't think that was your issue. I just thought it was interesting
09:10 PM aandrew: I couldn't find any z80 errata
09:40 PM rue_mohr: no, I'm wondering if I'v got soemthing new
09:42 PM rue_mohr: I have a few unique factors
09:42 PM rue_mohr: like I dont have interrupts engabled
09:44 PM rue_mohr: its almost like reset is a special interrupt type
09:44 PM rue_mohr: and it doesn't reset the internal NOP loop from halt if *something*
09:45 PM rue_mohr: see, halt redirects the instruction register to load NOPs
09:45 PM rue_mohr: so, as i understand, the z80 loads the same address repeatedly, but executes nops instead
09:47 PM rue_mohr: there are a few instructions that do funny things with flag
09:47 PM rue_mohr: s
09:47 PM rue_mohr: I'm wondering if SLA actually does something else that usually doesn't matter
10:11 PM aandrew: rue_mohr: just for shits and giggles, what if you enable interrupts and light an led when to try to use the reset button?
10:11 PM aandrew: just to see if that's a factor
10:53 PM rue_mohr: yea i need an led
10:53 PM rue_mohr: its on my list