Posts by orion3311

Caution: Non registered users only see threads and messages in the currently selected language, which is determined by their browser. Please create an account and log in to see all content by default. This is a limitation of the forum software.


Also users that are not logged in can not create new threads. This is a, unfortunately needed, counter measure against spam. Please create an account and log in to start new threads.

Don't Panic. Please wash hands.

  • Lyra3 and A2000

    Ok so just for reference, I made sure my scope was set up right and could see/trigger on data signals from a ps/2 keyboard (using the IBM model M (clikey), the textbook definition of ps/2). I then powered up the Lyra (using a nice HP power supply) with the keyboard connected (no Amiga), and probing the data and clock pins on the ps/2 keyboard connector, I get nothing on either clock or data pins. I then turned it off and made sure there was continuity from the plug to the appropriate pins, and there was. Seems either the chip or the resistor pack is pulling the ps/2 pins too high? I verified the resistor pack is 2.2k ohms. I tried 2 other real ps/2 keyboards and they all do the same.


    On probing the outputs of the Lyra, both the data and clock pins seem to be pulsing a bit at about one pulse a second or so, which I think is normal? (I believe thats the handshake to the Amiga, going by the instructions).


    Since the Amiga seems to have the same pinout as a normal IBM keyboard (I know the protocols are different), I plugged a keyboard directly into it, and had no problem seeing clock/data activity on the CIA. I actually got a screen to change on the Amiga test kit just pressing random keys, so I think the computer itself is likely good.


    I think I got a dud Lyra :-(

  • Lyra3 and A2000

    I'm having trouble with using a Lyra3 and an A2000. That said, I don't have an original Amiga keyboard, this was hopefully my only option for now. I get nothing out of the Lyra; tried it with two different keyboard adapters and finally two different keyboards (a mini ps/2 keyboard and then an IBM model M).


    I see the keyboard light up, but that's it. Pressing left/shift-pause doesn't light up scroll lock to indicate config mode at all.


    Since I had a ps/2 breakout board handy, I manually connected the clock/data signals to the CIA chip @ U300 to bypass the keyboard adapter, and still, I'm getting nothing. Did I get a dud, or could by motherboard be having issues? (5v is ok, and I tried swapping the CIA chips around).