Re: 6502 to 8501: new details

From: Konrad Burylo (
Date: 2002-02-23 19:54:54

At 19:05 02-02-22 +0100, you wrote:
>When the tape is connected, all the values of the cassette connector
>(measured on the bottom of the board) are near 0V or 5V. If I send a LOAD or
>SAVE command, the one I found to be the READ is around 2V, another one is
>over 6V (!). But maybe it is another signal.
That one which is greater than 6V - it must be the 'Cassette Motor Power'. 
I don't know the schematics of Plus4, but I've checked what's in the C-64.

>Maybe it is a stupid question: a 'pull up' resistor is a normal resistor
>simply connected between Vcc and the signal line or I have to ask for a
>specific type of resistor?
Don't try to buy a 'pull up' resistor ;-)
The name 'pull up' means, that the voltage is being pulled up by that 
resistor when nothing is actively driving the line. 'Pull down' resistors 
are also used...

Konrad Burylo

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