From: William Levak (wlevak_at_cyberspace.org)
Date: 2002-05-30 02:33:45
On Wed, 29 May 2002, Willi Kusche wrote:
> Hi, y'all!
>
> On 29-May-02, William Levak wrote:
>
> ->I have a Commodore 1670 modem with 4 dip switches next to the telephone
> ->connector. My manual mentions only 3 switches. Does anyone know what the
> ->fourth switch is for (if anything)?
>
>
> ->While testing modem, I found that they would not work, or work very poorly
> ->on one C64, but work very well on another C64. As far as I can tell,
> ->there is nothing wrong with either C64. Is there some problem with some
> ->C64's and modem?
>
> At some point in time, the table of constants used by the RS-232 support
> logic was changed in the ROMs. So it's likely that the C64 that doesn't work
> well with the modem has old ROMs.
Both have the second version of the ROM. The C64 that works is an
original version C64. The one that doesn't work is the "B" version C64.
Is it possible there are timing differences in the C64 hardware that
effect the modem?
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