English Amiga Board


Go Back   English Amiga Board > Support > support.Hardware > Hardware pics

 
 
Thread Tools
Old 22 January 2011, 10:32   #41
Jope
-
Jope's Avatar
 
Join Date: Jul 2003
Location: Helsinki / Finland
Age: 39
Posts: 7,406
Quote:
Originally Posted by chiark View Post
Hi Jope, quick question about the NMB keyboard: has yours got a link across J05/J06? Reason I ask is that I've just tried mine in an A500plus, and whilst the LEDs work, the caps light stays on but I get no response from the keyboard... Strangely, reset works
Reset works, because it is a separate wire that sends that in the A500.

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.
Jope is offline  
Old 24 January 2011, 16:10   #42
chiark
Needs a life

chiark's Avatar
 
Join Date: Jan 2008
Location: England
Posts: 1,630
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 .
chiark is offline  
Old 27 January 2011, 00:13   #43
chiark
Needs a life

chiark's Avatar
 
Join Date: Jan 2008
Location: England
Posts: 1,630
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.
chiark is offline  
Old 31 January 2011, 16:11   #44
ElectroBlaster
Junior Member
ElectroBlaster's Avatar
 
Join Date: Mar 2002
Location: Exeter, Devon, UK
Age: 45
Posts: 1,491
Send a message via ICQ to ElectroBlaster
Pooballs

I had one of those mitsumi pc keyboards back in the day... Unless its hiding in my storage shed but I doubt it
ElectroBlaster is offline  
Old 31 January 2011, 22:12   #45
chiark
Needs a life

chiark's Avatar
 
Join Date: Jan 2008
Location: England
Posts: 1,630
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...
chiark is offline  
Old 08 February 2011, 19:22   #46
mr_a500
Amiga-based Cyborg
mr_a500's Avatar
 
Join Date: Dec 2004
Location: Canada
Posts: 807
Quote:
Originally Posted by Jope View Post
Ha, it turns out NME is actually NMB. I've edited my posts. :-)
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)
mr_a500 is offline  
Old 08 February 2011, 20:33   #47
Jope
-
Jope's Avatar
 
Join Date: Jul 2003
Location: Helsinki / Finland
Age: 39
Posts: 7,406
Quote:
Originally Posted by mr_a500 View Post
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.
Hehe, I've been calling them NMEs for many many years now, so I've embarrassed myself too on many forums. :-)
Jope is offline  
Old 17 April 2011, 23:18   #48
ajk
Registered User
ajk's Avatar
 
Join Date: May 2010
Location: Helsinki, Finland
Posts: 1,286
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.
Attached Thumbnails
Click image for larger version

Name:	swi1.jpg
Views:	2907
Size:	61.1 KB
ID:	28475   Click image for larger version

Name:	swi2.jpg
Views:	2997
Size:	69.6 KB
ID:	28476  
ajk is offline  
Old 18 April 2011, 10:43   #49
Jope
-
Jope's Avatar
 
Join Date: Jul 2003
Location: Helsinki / Finland
Age: 39
Posts: 7,406
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.
Jope is offline  
Old 18 April 2011, 10:47   #50
ajk
Registered User
ajk's Avatar
 
Join Date: May 2010
Location: Helsinki, Finland
Posts: 1,286
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.
Attached Thumbnails
Click image for larger version

Name:	swi4.jpg
Views:	2881
Size:	69.3 KB
ID:	28486  

Last edited by ajk; 18 April 2011 at 20:09. Reason: Added photo
ajk is offline  
Old 18 April 2011, 20:44   #51
gehtjanx
Banned
 
Join Date: Apr 2011
Location: Vienna / Austria
Posts: 134
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
gehtjanx is offline  
Old 18 April 2011, 22:47   #52
ajk
Registered User
ajk's Avatar
 
Join Date: May 2010
Location: Helsinki, Finland
Posts: 1,286
@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
ajk is offline  
Old 19 April 2011, 01:20   #53
gehtjanx
Banned
 
Join Date: Apr 2011
Location: Vienna / Austria
Posts: 134
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 I do not even have a 99/4A.

Last edited by gehtjanx; 19 April 2011 at 01:28.
gehtjanx is offline  
Old 07 November 2011, 16:19   #54
chiark
Needs a life

chiark's Avatar
 
Join Date: Jan 2008
Location: England
Posts: 1,630
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.
chiark is offline  
Old 10 November 2011, 01:25   #55
salax54
Registered User
salax54's Avatar
 
Join Date: Jun 2008
Location: Athens Greece
Posts: 147
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.
salax54 is offline  
Old 11 November 2011, 13:17   #56
chiark
Needs a life

chiark's Avatar
 
Join Date: Jan 2008
Location: England
Posts: 1,630
Two words: nice work!
chiark is offline  
Old 12 November 2011, 14:16   #57
Jope
-
Jope's Avatar
 
Join Date: Jul 2003
Location: Helsinki / Finland
Age: 39
Posts: 7,406
Thanks for those. I've never bothered to take pictures when I've told people before that this can be done..
Jope is offline  
Old 24 November 2011, 04:29   #58
Akiko
Registered User
Akiko's Avatar
 
Join Date: Feb 2009
Location: Coleraine,UK
Age: 35
Posts: 148
My CD32 keyboard.

Attached Thumbnails
Click image for larger version

Name:	IMG_0038.jpg
Views:	1763
Size:	488.1 KB
ID:	29901   Click image for larger version

Name:	IMG_0039.jpg
Views:	500
Size:	485.6 KB
ID:	29902  
Akiko is offline  
Old 24 November 2011, 16:16   #59
Jope
-
Jope's Avatar
 
Join Date: Jul 2003
Location: Helsinki / Finland
Age: 39
Posts: 7,406
Quote:
Originally Posted by Akiko View Post
My CD32 keyboard.
Hmmm, that does look very nice. If only they had made more. :-)
Jope is offline  
Old 05 August 2012, 19:20   #60
TjLaZer
Registered User
TjLaZer's Avatar
 
Join Date: Sep 2004
Location: Tacoma, WA USA
Age: 47
Posts: 1,467
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!
TjLaZer is offline  
 


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Similar Threads
Thread Thread Starter Forum Replies Last Post
Wanted: Amiga 600 keyboard membrane (Blue) or full keyboard assembly RetromanIE MarketPlace 8 19 August 2012 15:48
Zipstick pictures Mike UK request.Other 5 13 September 2011 17:53
Pictures used on other sites Mr Creosote HOL suggestions and feedback 11 24 June 2006 15:40
HAM pictures jviper New to Emulation or Amiga scene 2 24 March 2006 02:03
Some nice pictures Dizzy Amiga websites reviews 0 13 January 2004 06:11

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +2. The time now is 00:55.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2019, vBulletin Solutions Inc.
Page generated in 0.11622 seconds with 14 queries