Is there any recent project to connect a PC (PS/2) keyboard to the CPC?

[gerald]

Gerald i sit on it all night But i start with it on previous evening . To be honest i think use this interface for my CPC464 new mainboard what i plan do.  If i made pcb and send one or two to you can you take time to check? And thank you for this.

I could test it, but not before 2 weeks. I just hope this is no a keyboard induced problem.

[Piotr]

No panic We all busy

[Piotr]

I redraw pcb for easier fit. My idea:
Solder ic socket piggyback on AY chip, (lines X0 to X7 ,VCC and GND done) , insert PCB using goldpins to socket , connect rest of signals via wire to pcb.

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[Bryce]

Nice Idea, but the AY is usually solder in. Pity there's no socketed IC with these signals.

Bryce.

[Joseman]

Nice Idea, but the AY is usually solder in. Pity there's no socketed IC with these signals.

Bryce.

Is there any electronically problem with socketing the cpc chips? more impedance on the signals? perhaps any noise on the signals if the socket is low quality or something like this?

[Bryce]

No, at those frequencies you won't have issues with noise and the (extremely low) additional impedance on a 5V system isn't critical. Over time sockets can cause problems due to dirty contacts, chips coming loose from vibration or whatever, but otherwise the CPC will work fine with sockets. I have a fully socketed 6128 somewhere and I always use sockets when I repair peoples CPCs, no matter what IC I needed to change. If possible I always use the more expensive "turned-low-profile" sockets, rather than the cheaper "dual-wiper" type.

Bryce.

[Joseman]

If possible I always use the more expensive "turned-low-profile" sockets, rather than the cheaper "dual-wiper" type.
Bryce.

with turned low profile you say something like this?:

http://au.rs-online.com/web/p/dil-sockets/0801796/

have you any trusty online store with quality on that?

[Bryce]

Yes, that's the type. You should be able to buy them from almost any local or online supplier. I buy mine here: IC-Sockel bei reichelt elektronik

Bryce.

[Piotr]

Ok yesterday i sent PCB to factory. I expect it approx 29 january.

[Joseman]

Good to know that

i'm keeping an eye on this project

[Piotr]

Boards on the way,

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[CraigsBar]

Are these all spoken for or would one be left over? I quite fancy a towerised Cpc lol.

[Joseman]

I don't think that these are reserved because i want 2 and nobody told me nothing!! 

[TFM]

Just an idea: Open a new tread for it and explain exactly what it is and what you want for one. Somehow all these things are hard to find in all the posts here. 

[Piotr]

Sure, i do it first when i assembly working board, now is somewhere beetween China and France (DHL courier) , i expect PCB delivery in wenesday-thursday.

[Piotr]

Board,

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In CPC 464,

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But is problem again, interface not detect keyboard correctly.( i check few Attiny)  I run CPC and CPC don't see PS2 keyboard, i uplug it and plug it back on running system, keyboard start working.

[gerald]

But is problem again, interface not detect keyboard correctly.( i check few Attiny)  I run CPC and CPC don't see PS2 keyboard, i uplug it and plug it back on running system, keyboard start working.

Did you check with a AtTiny2313A ? That the one I've used on the original design.

[Piotr]

I check with attiny 2313 in THT , attiny 2313 smd, 2313A smd, and bigger attiny 4312. Also pullup res in, and out, effect is as i say before.

[ralferoo]

But is problem again, interface not detect keyboard correctly.( i check few Attiny)  I run CPC and CPC don't see PS2 keyboard, i uplug it and plug it back on running system, keyboard start working.

Are you passively listening to the PS/2 keyboard or sending it commands?

Some keyboards are quite fussy about this kind of thing and like being told to change to mode 2 before they work. You could also try sending it a reset command.

[gerald]

Are you passively listening to the PS/2 keyboard or sending it commands?

Some keyboards are quite fussy about this kind of thing and like being told to change to mode 2 before they work. You could also try sending it a reset command.

The keyboard is explicitly reset at power up by the microcontroller :
   - 0xFF : reset command
   - wait for end of self test (keyboard should return AA)
   - 0xF6 : set default, should reset to mode2
   - 0xED 0x02 : num lock led ON
   - 0xF4 : enable scanning

What is interresting is that Piotr keyboad only works if it get unplugged an plugged after power up. This could mean that it does not like the reset sequence.

@piotr : is the capslock led on after power up ?
The keyboard set the 3 led on during reset, then reset them all. The microcontroller will only light the numlock once the reset is done.

[Piotr]

Hello, sorry for delay so:
Attiny 2313A AVR studio 4,  2 keyboards, one UK layout second one French.
Power up Amstrad and interface and keyboard connected, computer don't see keyboard, i unplug and plug back, interface start working. On both keyboards.
If i press numlock key, keyboard hanging again and i can't write. Led from numplck noty working.
Ok, Gerald i go to post office right now and i send you interface.

[gerald]

If i press numlock key, keyboard hanging again and i can't write. Led from numplck noty working.

Ok, it seems we got something to look at.
Pressing numlock will make the uC to toggle the numlock led, and it looks like your keyboards does not like it. The init sequence does that as well.
What are the exact model of your keyboard ?

Ok, Gerald i go to post office right now and i send you interface.

Finger crossed that it's not only keyboard related 

[Piotr]

One is Noname China UK layout, second is Logitech k120 French layout. I try also connect USB keyboard but without sukcess. Ok, we see. For now i finish next floppy interface to ZX Spectrum and i'm very busy assembling it for people.. Ufff.

[Piotr]

Ok, today next keyboard arrived, and working fine. I open second topic about this interface.

[gerald]

Ok, today next keyboard arrived, and working fine.

Good and bad news  . We still don't know why the other do no work.