[2018-08-13 07:05:18 CEST] * rune quit (ping timeout) [2018-08-13 11:57:43 CEST] * siggi joined [2018-08-13 11:58:28 CEST] * siggi quit (EOT) [2018-08-13 12:15:52 CEST] * siggi joined [2018-08-13 12:16:06 CEST] halloo [2018-08-13 12:16:16 CEST] hallo [2018-08-13 12:16:34 CEST] hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh [2018-08-13 12:16:51 CEST] aaa [2018-08-13 12:16:55 CEST] aaaa [2018-08-13 12:16:58 CEST] aaaaa [2018-08-13 12:17:06 CEST] aaa [2018-08-13 12:17:24 CEST] * siggi quit (EOT) [2018-08-13 17:52:38 CEST] * rune joined [2018-08-13 17:53:04 CEST] * dave_ joined [2018-08-13 17:55:41 CEST] * rune quit (ping timeout) [2018-08-13 19:16:10 CEST] * dave__ joined [2018-08-13 19:18:41 CEST] * dave_ quit (ping timeout) [2018-08-13 21:41:32 CEST] * dave__ quit (ping timeout) [2018-08-14 18:15:35 CEST] * rune joined [2018-08-14 18:40:52 CEST] * dave_ joined [2018-08-14 18:43:19 CEST] * rune quit (ping timeout) [2018-08-14 22:23:19 CEST] * dave_ quit (ping timeout) [2018-08-15 18:24:28 CEST] * rune joined [2018-08-15 19:27:33 CEST] * dave_ joined [2018-08-15 19:30:36 CEST] * rune quit (ping timeout) [2018-08-15 22:06:28 CEST] * dave_ quit (ping timeout) [2018-08-16 19:23:29 CEST] * dave_ joined [2018-08-16 21:37:26 CEST] * dave__ joined [2018-08-16 21:40:16 CEST] * dave_ quit (ping timeout) [2018-08-16 23:57:40 CEST] * dave__ quit (ping timeout) [2018-08-19 19:50:43 CEST] * rune joined [2018-08-19 20:01:41 CEST] * heinz joined [2018-08-19 20:01:53 CEST] hello dave [2018-08-19 20:02:13 CEST] Hello Heinz [2018-08-19 20:02:29 CEST] Did you have a good trip to Frankfurt [2018-08-19 20:03:08 CEST] i did not travel to frankfurt because of a flew. [2018-08-19 20:03:25 CEST] Oh dear, in the middle of summer? [2018-08-19 20:03:32 CEST] brigitte was there without me and happy to touch the babies. [2018-08-19 20:03:59 CEST] You cant risk giving new babies the flu [2018-08-19 20:04:09 CEST] right. [2018-08-19 20:04:24 CEST] what about the zx81 [2018-08-19 20:04:29 CEST] ? [2018-08-19 20:04:49 CEST] OK, Issue 1 has everything with a signal but not on the output [2018-08-19 20:05:12 CEST] So I added new capacitors to that Issue 3 and there is nothing at all [2018-08-19 20:05:17 CEST] what output do you mean? [2018-08-19 20:05:20 CEST] But I just finishe [2018-08-19 20:05:36 CEST] The video output. Pack porch only, no video signal [2018-08-19 20:06:31 CEST] I grabbed all the signals yesterday, but I think I [2018-08-19 20:06:35 CEST] you have mentioned that there is no signal at adress line 2. [2018-08-19 20:06:37 CEST] missed one of the pins [2018-08-19 20:06:56 CEST] Thats fine now. I changed the socket to turned pin [2018-08-19 20:07:22 CEST] The signal was at the solder joint, but not on the IC leg [2018-08-19 20:07:28 CEST] Its fine now [2018-08-19 20:07:35 CEST] good job. [2018-08-19 20:07:50 CEST] I need to understand the control signals next [2018-08-19 20:07:52 CEST] you talk about the iss3. [2018-08-19 20:08:10 CEST] Yes, do you remember I removed all the caps and most of the resistors [2018-08-19 20:08:27 CEST] I replaced these today, just finished at 18:30 [2018-08-19 20:08:41 CEST] There is no data on data or address lines [2018-08-19 20:08:52 CEST] I need to check the connections etc next [2018-08-19 20:09:09 CEST] is there a clock? [2018-08-19 20:09:19 CEST] at pin6 cpu? [2018-08-19 20:09:23 CEST] There is a clock signal at the TR2 output [2018-08-19 20:09:38 CEST] Also on the Crystal despite using Andys ULA [2018-08-19 20:10:05 CEST] also at pin6 cpu? [2018-08-19 20:10:23 CEST] I am not sure, as I said. Just finished, walked the dog and onto IRC chat [2018-08-19 20:10:35 CEST] I'll check that tomorrow [2018-08-19 20:11:24 CEST] These are long term projects. But I will now use a working ZX81 to compare signals [2018-08-19 20:11:27 CEST] do that. as soon as the cpu gets a clock it will start running. that means that address an data lines shoul oscillate. [2018-08-19 20:11:45 CEST] OK. What should TR1 be doing? [2018-08-19 20:12:07 CEST] i will have a look to the scheme. wait. [2018-08-19 20:12:19 CEST] Pin 6 is next to be checked, I'll maybe try after our chat [2018-08-19 20:13:32 CEST] tr1 is needed for halt command. [2018-08-19 20:13:54 CEST] Its always High when I checked [2018-08-19 20:14:22 CEST] you could check if it works. test signal at collector or at resistor r17. [2018-08-19 20:14:32 CEST] but wait. [2018-08-19 20:15:10 CEST] i have only the scheme for iss1 and do not know if it is valid also for iss3. [2018-08-19 20:15:58 CEST] This was on issue 1 version [2018-08-19 20:16:25 CEST] Lets forget Iss 3 for now. Its early days and I can check all links and for shorts [2018-08-19 20:16:38 CEST] iam wrong. not halt but wait. [2018-08-19 20:17:05 CEST] So is High constant wait? [2018-08-19 20:17:17 CEST] the function of tr1 is the following. [2018-08-19 20:17:24 CEST] Also I noticed that a lot of voltages were 3.3v [2018-08-19 20:18:33 CEST] measured by meter or scope? [2018-08-19 20:18:39 CEST] Scope [2018-08-19 20:19:01 CEST] steady 3.3 and no oscillatins? [2018-08-19 20:19:16 CEST] tions [2018-08-19 20:19:21 CEST] Im going to email an image, can you say if this signal is what you get with oscillating data/address [2018-08-19 20:19:29 CEST] Yes, its steady. [2018-08-19 20:19:48 CEST] yes, send a picture. [2018-08-19 20:20:48 CEST] what about the wheather? [2018-08-19 20:20:58 CEST] still hot and dry as here? [2018-08-19 20:23:31 CEST] No, very wet. Thought we were going to get a storm this weekend, but today has been nice [2018-08-19 20:23:51 CEST] The pics have a number. Thats the PIN on the ULA [2018-08-19 20:24:21 CEST] got the pics. [2018-08-19 20:24:31 CEST] What about you? Any rain? Weather men promise nice weather into octobver and it pours with rain for a week [2018-08-19 20:24:55 CEST] #16: video output at ula. right? [2018-08-19 20:25:06 CEST] Yes, or lack of it [2018-08-19 20:25:19 CEST] Nice white screen [2018-08-19 20:25:43 CEST] #14: clk [2018-08-19 20:25:50 CEST] yep [2018-08-19 20:26:18 CEST] #19: d7, looks good. [2018-08-19 20:26:55 CEST] OK, thats what I wasnt sure about. [2018-08-19 20:27:22 CEST] #9: mreq, good. [2018-08-19 20:28:12 CEST] #1: a7 at ula, looks good. [2018-08-19 20:28:54 CEST] you should adjuste the time basis at the scope: i bit slower. [2018-08-19 20:29:28 CEST] test pin 17 at ula. [2018-08-19 20:29:37 CEST] oscillating? [2018-08-19 20:29:43 CEST] I'll send one 5v and low volt from Z80 next. yes I am going to do the pics again as I just wanted to see what was on all the pins 1st time [2018-08-19 20:31:25 CEST] what is #45 ? [2018-08-19 20:31:35 CEST] Pin 6 - Clock [2018-08-19 20:31:57 CEST] sorry 40 will be 11 and 46 will be 17 [2018-08-19 20:32:32 CEST] Those are just to illustrate the low volts [2018-08-19 20:34:20 CEST] could you take the picture of pin6 clk once again? higher frequency at the scope and the full picture. [2018-08-19 20:34:44 CEST] Sure, I will need to set up my laptop so it wont be tonight [2018-08-19 20:35:36 CEST] How good is the replacement ULA from Retroleum? [2018-08-19 20:35:40 CEST] just shift the picture on the screen with "}-position" a bit up. [2018-08-19 20:35:44 CEST] upward. [2018-08-19 20:35:56 CEST] ok [2018-08-19 20:36:33 CEST] my retro-ula works well. better video signal cause of back porch. [2018-08-19 20:37:00 CEST] I would like to get a set of reference pics of a working ZX81 created. [2018-08-19 20:37:33 CEST] No dot crawl or shimmers with ULA? [2018-08-19 20:37:37 CEST] please, take a photo of ula pin 17 [2018-08-19 20:37:49 CEST] OK [2018-08-19 20:38:07 CEST] a light shimmer with the ula. [2018-08-19 20:38:58 CEST] Whats PIN 17 ULA [2018-08-19 20:39:04 CEST] I have that here [2018-08-19 20:39:07 CEST] yes [2018-08-19 20:40:34 CEST] Sent [2018-08-19 20:41:27 CEST] what pin is 57/56? [2018-08-19 20:41:40 CEST] 56 = 17 [2018-08-19 20:41:45 CEST] 57 = 18 [2018-08-19 20:42:47 CEST] The baseline is 3 division below the centre, so the look around 3.3 volts [2018-08-19 20:42:50 CEST] 18 is the address line a15, not intereting. [2018-08-19 20:43:27 CEST] but 17 should oscillate. compare this with a working zx81. [2018-08-19 20:43:32 CEST] tomorrow. [2018-08-19 20:43:56 CEST] dave, i got now some pics and will think about them. [2018-08-19 20:43:57 CEST] OK, I will. I need to stop now and go swap car positions with Liz so I can go to work tomorrow [2018-08-19 20:44:08 CEST] no further ideas for today. [2018-08-19 20:44:23 CEST] have a nice week. [2018-08-19 20:44:34 CEST] No problem. Knowing what data and address looks like is a big help [2018-08-19 20:44:41 CEST] You too. Thanks for advice [2018-08-19 20:44:44 CEST] bye. [2018-08-19 20:44:45 CEST] Bye [2018-08-19 20:44:50 CEST] * rune quit (Leaving) [2018-08-19 20:44:50 CEST] * heinz quit (EOT)