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#41 | |
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Join Date: Jul 2003
Location: Helsinki / Finland
Age: 44
Posts: 9,961
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Quote:
I have a couple of bare ones and J05/06 are not linked in these. If the caps light stays on, it seems the keyboard can't reset itself properly. I'd probably just swap the 6570 and perhaps the 555 timer, but I've never had that problem myself so I have no prior experience. |
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#42 |
Needs a life
![]() Join Date: Jan 2008
Location: England
Posts: 1,707
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Thanks! I'll have an experiment. It looks like the matrix is OK, and that there's no stuck keys, so I guess it must be in the chips.
I've had a quick trace of the circuit and learnt that the reset signal comes from the 74LS27P (U2), as that has a parallel connection to the keyboard matrix. Well, it was interesting to me ![]() |
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#43 |
Needs a life
![]() Join Date: Jan 2008
Location: England
Posts: 1,707
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Damn and blast: changed the timer chip, and then changed the controller.
Exactly the same: just the caps lock light on permanently. Time to check every connection again. Damn damn damn damn damn. |
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#44 |
Junior Member
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Pooballs
![]() I had one of those mitsumi pc keyboards back in the day... Unless its hiding in my storage shed but I doubt it ![]() |
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#45 |
Needs a life
![]() Join Date: Jan 2008
Location: England
Posts: 1,707
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indeed.
Changed the connector. Nothing. Changed the transistors (3904s) for known good from another keyboard (C458) - that stopped the Amiga from booting... Not surprising, but interesting that different components are used! Traced every connection on the 6570, and the two gates... All good. Made a couple of extra wire connections to make sure of connectivity. No change. I could change the two gates, but I don't suspect 'em given that the reset circuit works. At a loss to know what to do. I'm starting to trace every connection... |
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#46 |
Amiga-based Cyborg
Join Date: Dec 2004
Location: Canada
Posts: 808
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Yeah... thanks for that. (said sarcastically)
I originally called that an "NMB" keyboard, but changed to "NME" when I saw your posts.... because it sounded like you knew what you were talking about. Now, it won't let me edit them back. Not only that, but I went on a keyboard forum (geekhack), calling it an "NME" keyboard - exposing my ignorance for all to see. Yes... thanks. ![]() ![]() I've since become a bit of a keyboard fanatic. If I could design my ultimate Amiga keyboard, it would have the layout and size of the A1000, in a metal case, with IBM Model F type buckling spring switches (or orange Alps) and double-shot black keys with white centred text. (similar to this) |
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#47 | |
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Join Date: Jul 2003
Location: Helsinki / Finland
Age: 44
Posts: 9,961
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Quote:
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#48 |
Registered User
Join Date: May 2010
Location: Helsinki, Finland
Posts: 1,341
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Anyone happen to know what the A1000 switches are exactly, and where some replacements might be obtained (eg. certain PC keyboards)? I'm not convinced they are Cherry, or at least they must have changed the design at some point.
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#49 |
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Join Date: Jul 2003
Location: Helsinki / Finland
Age: 44
Posts: 9,961
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Looking at that, they certainly don't sport the cherry logo. I think I'll have to dismantle my shoddier A1000 keyboard again and see for myself.
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#50 |
Registered User
Join Date: May 2010
Location: Helsinki, Finland
Posts: 1,341
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It's a heck of a pain to dismantle, needs desoldering, but if you can be bothered, any help is appreciated
![]() In the meanwhile I opened up the switch, and the internal mechanics don't seem similar to Cherry switches either. I don't have a photo of the internals right now but basically there is a spring that bends sideways instead of being compressed. Here's a photo of the innards too now. Last edited by ajk; 18 April 2011 at 19:09. Reason: Added photo |
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#51 |
Banned
Join Date: Apr 2011
Location: Vienna / Austria
Posts: 134
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Very Importat Note
Hello,
I have a big number of replacement keys available , including key caps for CDTV. For information: There are two mitsumi keyboards, one with foil, other with pcb: http://scacom.bplaced.net/Collection...warttasta1.jpg VERY IMPORTAT NOTE: Mitsumi key-foil is SELF DESROYING as discribed on my German homepage. here is a picture http://scacom.bplaced.net/Collection...warttasta2.jpg this is inside on nearly every mitsumi keyboard. Dust comes onto the foil, when pressing space etc, space key is destroying the contact foil forcing keyboard to fail. NOTE: Repair nearly is impossible or very heavy work. Maybe sometimes this part will be translated on exact solution, cause and how to clean. DO NOT CLEAN with WET things, as the foil will be destroyed on the broken parts. Just be sure getting the dust away, maybe make sure this part is protected. Positions: 2x space (lot of traces), caps lock. Maybe others. As well as RUST on the metal is damaging the foil. ASK for informations, questions via PM or for replacement keys or parts you need. There is another keyboard used in Amiga 500. It uses 2 foils to the pcb and is better as mitsumi ones. gehtjanx |
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#52 |
Registered User
Join Date: May 2010
Location: Helsinki, Finland
Posts: 1,341
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@gehtjanx
Maybe not the right thread for advertising, but ok, do you have any A1000 keyboard related spare parts? All others are common as mud in comparison, it seems ![]() |
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#53 |
Banned
Join Date: Apr 2011
Location: Vienna / Austria
Posts: 134
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sry, no 1000 keyboard parts except cable. CDTV is too very unlikly to find separete keys if they are missing.
Now back to topic, please PM if there are any spare parts questions. If there are questions about the keyboard problems t's in public interest and can be posted here. thanks, gehtjanx (just wrote it here as some are searching parts on page 1) EDIT: @ mister_a500: I saw an Ti 99/4 instead 99/4A, this is a very rare machine, but not mine ![]() Last edited by gehtjanx; 19 April 2011 at 00:28. |
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#54 |
Needs a life
![]() Join Date: Jan 2008
Location: England
Posts: 1,707
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FINALLY! I now have a working NMB 500 keyboard
![]() Cleaning it up now, as it looks like it's been at the bottom of a cow shed for the last 24 years or so... Sheesh, 24 years. |
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#55 |
Registered User
Join Date: Jun 2008
Location: Athens Greece
Posts: 153
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Seeing as keyboards are an interesting topic, here's one of my hacks..
This is the interface pcb of a Micronik Infinitiv keyboard ![]() This is the rear of a CDTV keyboard (Mitsumi build) ![]() And some closeups ![]() ![]() This is the rear of an A1200 keyboard ![]() I always wanted to make the CDTV keyboard usable as a PS/2 unit. So i thought of combining the A1200 keyboard, CDTV casing, and Micronik pcb. The A1200 keyboard fits in the casing, meaning that the keys actually fall into place nicely. However, there's a few plastic tabs that prevent the keyboard from "sitting in" properly. This is where the obstacles are ![]() So, they need cutting, and presto! ![]() Now, the interface is another obstacle itself. The pcb has to be put a bit remote from the ribbon cable, or else the casing's upper and lower halves won't snap. To do this, i decided to unsolder the ribbon socket from the pcb.. ![]() And extend the socket using some cables. ![]() ![]() This is the whole thing connected ![]() I can now place it just about any where under the keyboard chassis. Here's the finished job. ![]() A1200 in, CDTV out! ![]() And after testing, it proves working! ![]() ![]() This is not targeted towards a regular pc usage, but rather to hook up to my Walker replica. I could always use a Keyrah in there and make it USB, but i prefer the PS/2 that pretty much matches the Walker's keyboard socket. |
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#56 |
Needs a life
![]() Join Date: Jan 2008
Location: England
Posts: 1,707
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Two words: nice work!
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#57 |
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Join Date: Jul 2003
Location: Helsinki / Finland
Age: 44
Posts: 9,961
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Thanks for those. I've never bothered to take pictures when I've told people before that this can be done..
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#58 |
Registered User
Join Date: Feb 2009
Location: UK
Posts: 258
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My CD32 keyboard.
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#59 |
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Join Date: Jul 2003
Location: Helsinki / Finland
Age: 44
Posts: 9,961
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#60 |
Registered User
Join Date: Sep 2004
Location: Tacoma, WA USA
Age: 52
Posts: 1,937
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Looking for some spare keys for a NMB keyboard if anyone can spare them you can help save a keyboard!
ESC F5 F10 1 2 Help Tab Q A Left Shift Also need one white plastic mount for key. Thanks! |
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