.... For 20eur it was worth a punt if it works or not.
At the moment power led is good, but nothing else so probably ram gone bad.
But it has an usual combination of French keys with qwerty layout. Anyone else encountered such a beast? (https://uploads.tapatalk-cdn.com/20171108/f7b6441f63c7a67a2ecff2a3cff35eff.jpg)(https://uploads.tapatalk-cdn.com/20171108/2800ac80e061c1cfab528c671ca979a9.jpg)
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Quote from: CraigsBar on 19:25, 08 November 17
.... For 20eur it was worth a punt if it works or not.
At the moment power led is good, but nothing else so probably ram gone bad.
But it has an usual combination of French keys with qwerty layout. Anyone else encountered such a beast?
Hope you get it working. :)
Looks like someone has just swopped the keys over to me, the heights are wrong. ???
Quote from: Phantomz on 20:41, 08 November 17
Hope you get it working. :)
Looks like someone has just swopped the keys over to me, the heights are wrong. ???
I'll know when I get it working... Or dump the rom.
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Can you stop posting pictures from your phone until you've worked out how to sensibly size the pictures?
Bryce.
Quote from: Bryce on 08:48, 09 November 17
Can you stop posting pictures from your phone until you've worked out how to sensibly size the pictures?
Bryce.
Hahahaha ;D
I just drag them on the desktop.
Quote from: VincentGR on 12:11, 09 November 17
Hahahaha ;D
I just drag them on the desktop.
Whilst sitting in ikea I have installed a 2nd camera app. @Bryce does this suit your eyesight better?(https://uploads.tapatalk-cdn.com/20171109/bdb2565ec80c1b339dff03676e441801.jpg)
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Can you post a picture with Choc-Chip biscuits to be reeeaaalllly sure it's working :)
Bryce.
Quote from: Bryce on 08:48, 09 November 17
Can you stop posting pictures from your phone until you've worked out how to sensibly size the pictures?
Bryce.
What about a sensible auto-resize option instead?
https://custom.simplemachines.org/mods/index.php?mod=1197
I think the problem with those types of forum mods is that they no longer allow the other picture options such as thumbnail etc? But I could be wrong.
Bryce.
Quote from: Bryce on 15:25, 09 November 17
I think the problem with those types of forum mods is that they no longer allow the other picture options such as thumbnail etc? But I could be wrong.
Bryce.
OK, back on topic....
RAM is gone for sure. It's a cost down board. Anyone recognise that rom? Looks a bit "custom" to me. Possibly unsoldered.
Currently burning the lower rom RAM test. (https://uploads.tapatalk-cdn.com/20171109/972dea868a24a0854b7b43133c8f977e.jpg)(https://uploads.tapatalk-cdn.com/20171109/e193388a050e3a4f7ec6571bcad1d9e9.jpg)
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Quote from: CraigsBar on 16:13, 09 November 17
OK, back on topic....
RAM is gone for sure. It's a cost down board. Anyone recognise that rom? Looks a bit "custom" to me. Possibly unsoldered.
Currently burning the lower rom RAM test. (https://uploads.tapatalk-cdn.com/20171109/972dea868a24a0854b7b43133c8f977e.jpg)(https://uploads.tapatalk-cdn.com/20171109/e193388a050e3a4f7ec6571bcad1d9e9.jpg)
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OK. Time to order some 4164 ram and sockets me thinks! (https://uploads.tapatalk-cdn.com/20171109/b38028dbfef3fc0e1c9f5a5a0f22127c.jpg)
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That's an EPROM, so someone has replaced it in the past.
Bryce.
P.s. Nicely sized pictures by the way :)
Quote from: Bryce on 16:25, 09 November 17
That's an EPROM, so someone has replaced it in the past.
Bryce.
P.s. Nicely sized pictures by the way :)
12.45 eur for 8 new 4164s and 2.94 for 10 sockets.
Edit: I cannot feel a depression for the window of that rom/eprom. It will be very interesting to get it up and running and find out how the machine behaves.
Quote from: Bryce on 16:25, 09 November 17
That's an EPROM, so someone has replaced it in the past.
Bryce.
P.s. Nicely sized pictures by the way :)
Also nicely sized cost down board. I knew these were small but I did not realise they were *that* small. Serious room for Internal expansion. I wonder if I could shoehorn a symbiface 2 and ide to sd card reader into the case?
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Quote from: CraigsBar on 16:51, 09 November 17
12.45 eur for 8 new 4164s and 2.94 for 10 sockets.
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You also have the option to use 2 64kx4 bit instead of the 8x64kx1. It' the 2 empty footprint next to the pre-asci. It may be cheaper ;)
Quote from: gerald on 17:17, 09 November 17
You also have the option to use 2 64kx4 bit instead of the 8x64kx1. It' the 2 empty footprint next to the pre-asci. It may be cheaper ;)
It might have been as I have some 41464 ram here already. Ahh well ordered the original fitted parts now.
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Step one done. All old ram removed. No lifted traces. My neatest desolder job ever... I'm getting better at this shit lol!
Hopefully I won't have to send this one to @bryce for an "oops I f*cked up" type repair. (https://uploads.tapatalk-cdn.com/20171110/7317adcbbdbb332685a836a8e64230dc.jpg)(https://uploads.tapatalk-cdn.com/20171110/d3de490d3a922dbb2ee085b73fc5cf81.jpg)
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I find the last photographs a bit small...
Quote from: Patrick on 14:46, 10 November 17
I find the last photographs a bit small...
I thought the same thing but I didn't mentioned that as it would be the ultimate trolling ;D ;D ;D
So having taken the 'oh so small' board out today to desolder the ram (I am just gonna replace the lot) I think I have found a solution to internally mount a symbiface 2 (I have 2 of them afterall) but this raises a question....
What is the best option for fitting a ribbon cable inside a cpc case. Strip the ends of the cable and solder onto the centronics mounting points? Fit a centronics connector backwards (pointing into the case) and then use a ribbon cable with every pair of 2 wires twisted? Or something else. Ideally I still want a working expansion port for an m4 board!
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Quote from: CraigsBar on 16:23, 09 November 17
me thinks!
HELLOOOOOO !!! Oh sorry :doh:
(http://vignette4.wikia.nocookie.net/rickandmorty/images/6/6c/MeeseeksHQ.png/revision/latest?cb=20150930232412)
OK last problem with this cpc.... Tape counter! Has anyone got a 3d printable reset button file? Or a part number for a compatible replacement counter?
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[ot]Off-topic again, but no additional mods are needed on the forum, assuming you post from the desktop; when uploading an image you have the option to post inline, end-of-post, thumbnail or original. As Bryce said, other mods will probably interfere with this functionality...[/ot]
Sockets. Chips.. (https://uploads.tapatalk-cdn.com/20171114/4041c3e4f6e37d186f08a0926c99e575.jpg)(https://uploads.tapatalk-cdn.com/20171114/38f9bd1b798f83ca14df3d96c7d7f802.jpg)
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Quote from: CraigsBar on 19:31, 14 November 17
Sockets. Chips.. (https://uploads.tapatalk-cdn.com/20171114/4041c3e4f6e37d186f08a0926c99e575.jpg)(https://uploads.tapatalk-cdn.com/20171114/38f9bd1b798f83ca14df3d96c7d7f802.jpg)
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Test.... Yay! Rescued (https://uploads.tapatalk-cdn.com/20171114/44a5abf97d7ddf761222daf712f6958c.jpg)(https://uploads.tapatalk-cdn.com/20171114/ed74671b7611a56f17d081ec8fff980b.jpg)
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Quote from: CraigsBar on 19:45, 14 November 17
Test.... Yay! Rescued (https://uploads.tapatalk-cdn.com/20171114/44a5abf97d7ddf761222daf712f6958c.jpg)(https://uploads.tapatalk-cdn.com/20171114/ed74671b7611a56f17d081ec8fff980b.jpg)
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The relay clicks correctly correctly but the play button always works. Any ideas on that one?
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I guess a short somewhere on the tape drive pcb in the vacinity of the relay, but I cannot see anything
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Check the leaf switch that the play button actuates.
Bryce.
Quote from: Bryce on 08:57, 15 November 17
Check the leaf switch that the play button actuates.
Bryce.
Yeah the leaf switch is working. Is it possible the relay has failed.... But still clicks?
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Yes, but you can easily test that with a multimeter.
Bryce.
Quote from: Bryce on 08:35, 16 November 17
Yes, but you can easily test that with a multimeter.
Bryce.
Which pins are which on the relay?
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Can't remember, can you post a (reasonably sized :D ) picture of the top and bottom sides and I'll tell you.
Bryce.
Quote from: Bryce on 13:57, 16 November 17
Can't remember, can you post a (reasonably sized :D ) picture of the top and bottom sides and I'll tell you.
Bryce.
Yep. I'll dismantle it again tonight
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Of course. when it clicks there will be approx. 5V across the coil pins, so it should be easy to tell which pins are the coil and which are the contacts.
Bryce.
Quote from: Bryce on 16:21, 16 November 17
Of course. when it clicks there will be approx. 5V across the coil pins, so it should be easy to tell which pins are the coil and which are the contacts.
Bryce.
OK. The eprom in it is a standard UK qwerty layout. I have sourced a qwerty keyboard to put in there so the symbols will all match up.
Now If I can get the tape behaving itself it'll be perfect.
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Quote from: CraigsBar on 14:43, 16 November 17
Yep. I'll dismantle it again tonight
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Sorry this took longer than planned but here is the photo of the tape board.
(https://uploads.tapatalk-cdn.com/20171124/fd8d9463944e3574ece8db7f23c97422.jpg)(https://uploads.tapatalk-cdn.com/20171124/170cb4caf5e1872cf2f5de2e4ebee86b.jpg)
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Red is Coil Positive (5V), Black is Coil Negative (0V) and the two yellow ones are the switch contacts. Because the contacts will have some potential across them when the circuit is powered, to measure if they are working, don't use a continuity tester as it will probably always buzz due to the circuit current. Measure the voltage across the contacts and it should go to zero when the contacts close.
Bryce.
Quote from: Bryce on 15:54, 24 November 17
Red is Coil Positive (5V), Black is Coil Negative (0V) and the two yellow ones are the switch contacts. Because the contacts will have some potential across them when the circuit is powered, to measure if they are working, don't use a continuity tester as it will probably always buzz due to the circuit current. Measure the voltage across the contacts and it should go to zero when the contacts close.
Bryce.
Thanks Dr. Bryce, I am just sat in ikea dublin to grab an inexpensive meal before I enter the over priced environment that is senna line to Holyhead. I'm back on Wednesday so will get measuring then. With the correct UK keyboard fitted today the machine is getting there.
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Enjoy the Köttbullar. Let me know how it goes when you get back.
Bryce.
Quote from: Bryce on 08:39, 27 November 17
Enjoy the Köttbullar. Let me know how it goes when you get back.
Bryce.
Back now. And I've replaced the relay but the issue is still the same. Any other ideas. I guess there is a short somewhere holding the remote circuit closed when it should be open by default.
Is there anything close to the ram on a cost down that could cause this? Since the only thing g I have done is socketed and new chips to get the machine booting.
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New photos of the tape board and ram swap soldering.... Just in case(https://uploads.tapatalk-cdn.com/20171212/eed4f1d6d7beba170f99297b36c404f2.jpg)(https://uploads.tapatalk-cdn.com/20171212/30ed1c8e37acb58e00e0015c789c68e6.jpg)
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OK I fixed it! Traced the tracks and cables to a 2nd leaf switch behind the play key. It was not operating! Cleaned the contacts and straightened the springs so they actually separate and bingo.... Tap remote works perfectly once more.
Attached is the celebratory game. Loaded from tape of course. (https://uploads.tapatalk-cdn.com/20171213/8fd3cea2b39b0d21fee4273370910074.jpg)
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So you were looking at the wrong leaf switch the whole time :D
Bryce.
Quote from: Bryce on 08:53, 13 December 17
So you were looking at the wrong leaf switch the whole time :D
Bryce.
Yes. No body told me there were 2 a nice big obvious one. And teeny weeny one under the play button.
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I didn't mention that there were two, but I definitely mentioned "the play button" :) Let me check....
http://www.cpcwiki.eu/forum/amstrad-cpc-hardware/just-collected-this/msg151846/#msg151846
Yup, as I thought :D
Bryce.
Quote from: Bryce on 12:53, 13 December 17
I didn't mention that there were two, but I definitely mentioned "the play button" :) Let me check....
http://www.cpcwiki.eu/forum/amstrad-cpc-hardware/just-collected-this/msg151846/#msg151846 (http://www.cpcwiki.eu/forum/amstrad-cpc-hardware/just-collected-this/msg151846/#msg151846)
Yup, as I thought :D
Bryce.
In my Defence the play button activates them both, one it opens the other it closes via an aluminium rocker.
The one it closes (via the rocker) is large and obvious
The one it opens is tiny and well concealed!
Anyway, Yes @Bryce (http://www.cpcwiki.eu/forum/index.php?action=profile;u=225) it seems you were correct (as normal ;)) and I have a working CPC 464 again... I even sourced a nearly New keyboard for it from a broken machine that was packaged up and never used. The Keyboard now matched the ROM which is always handy.
All in all the project CPC464 has cost me about 40eur (20 for the machine, 12 for the keyboard and 8 for the RAM & sockets) I am happy with that :)
I have a cost down 464 with X-Mem installed internally, works fine. Just solder ribbon cable to the Centronics holes. The external edge connector will still work.
Quote from: bjt on 10:52, 26 December 17
I have a cost down 464 with X-Mem installed internally, works fine. Just solder ribbon cable to the Centronics holes. The external edge connector will still work.
I have 2 symbiface 2 boards here, I was thinking about installing one of those internally, using the 12v from the ctm644 to power it. Is it easier to clear out the centonics holes and solder the wire through them, or just tack on to of the filled holes I wonder. I guess clearing out and poking the tinned wires through makes a better, more robust contact.
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Yep I cleared out the holes. Wasn't too difficult.
Quote from: CraigsBar on 12:18, 26 December 17
I have 2 symbiface 2 boards here, I was thinking about installing one of those internally, using the 12v from the ctm644 to power it. Is it easier to clear out the centonics holes and solder the wire through them, or just tack on to of the filled holes I wonder. I guess clearing out and poking the tinned wires through makes a better, more robust contact.
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If you just tack them and a solder joint breaks then there's a high chance of causing a short. If it's worth doing, it's worth doing properly.
Bryce.