Re: apple2 slot 0

["Giovanni" <gsantin@mclink.it>]

Linards Ticmanis ha scritto:

> *Or* it's a Videx-Style 80 column card, which does 80 columns, but does
> not fill out the 16K memory space. This one goes into slot 3 in the
> normal setup. It has some large chips on the card (about the same size
> as the ROM chips on the motherboard) along with small chips. It has a
> thick, round wire attached that you plug into the normal video output on
> the back of the Motherboard. Also it has a Cinch socket where you plug
> in your Monitor. You activate the card by saying PR#3 at the BASIC prompt.
>
> I have never heard of Apple II+ cards that combine Memory Expansion and
> 80 column capability on one and the same card. That type of card was
> used only on the IIe, where it goes into the AUX slot.
>
> Does the power light on your Apple II+ still light up? If not, I suspect
> the power supply was damaged.
>
> --
> Linards Ticmanis

You described exactly the board I was trying to make works. The power
supply is fine, the light comes on, so I think that the fact that the
computer stopped working after I put this card in to slot#0 is just
because it felt to do so on that moment...
I borrowed an oscilloscope and discovered that there is no clock going
to the micro, even if the oscillator is working fine giving about
14MHz. So now I'm downloading schematics to track the problem.

Thanks for your intelligence,
                                Giovanni