Re: 6502 to 8501: new details

From: Daniele Gratteri (daniele_gratteri_at_inwind.it)
Date: 2002-02-22 07:28:08

----- Original Message -----
From: "Marko Mäkelä" <marko.makela@hut.fi>
To: <cbm-hackers@cling.gu.se>
Sent: Thursday, February 21, 2002 10:30 PM
Subject: Re: 6502 to 8501: new details


> What if you added a pull-up resistor to the CASSETTE WRITE line?  I had
> to do the same in the C2N232 device (for CASSETTE READ).  This is just a
> wild guess, as the Atmel AT90S2313 is a CMOS device and not an NMOS one
> like the 6522 is.  Have you measured the voltages on CASSETTE WRITE when
> recording and on CASSETTE READ when playing back the tape?  Even when
> using a digital multimeter, the voltages should read something between 0
> and 5 volts, or steady 0 or 5 volts if the circuit doesn't work properly.

I will try to measure voltages on the CASSETTE READ and WRITE lines.
Can you explain me what is a 'pull-up' resistor and how to connect one of
these? What value has it to be?
  ____
 / ___|____   Daniele Gratteri, Italian Commodore and Amiga user  / /
| |   |___/   E-MAIL: daniele_gratteri@inwind.it                 / /
| |___|___\   URL: http://utenti.tripod.it/danielegratteri   \ \/ /
 \____|       IRC: FIAT1100D - ICQ: 53943994                  \/\/


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