On Thu, Jan 10, 2019 at 5:33 PM Pasi 'A1bert' Ojala <a1bert@iki.fi> wrote: > > On 10.01.2019 17:22, smf wrote: > > On 10/01/2019 08:11, André Fachat wrote: > >> I know this solution, but IIRC this prevents bidirectional operation > >> without extra direction control. > > > > Don't the c128 & 1571 have extra hardware for direction control on the > > 6526 ? > > http://www.iki.fi/a1bert/Dev/burst (already mentioned earlier, but this > is the "forever link"): > > "The C128 hardware includes a buffer driver between SRQ and the cassette > read line so that cassette activity or cassette drive presence will not > disturb the fast serial port. It also has a two-directional buffer that > connects SRQ and DATA to the CIA1 synchronous serial port. The direction > is controlled by the MMU chip. These buffers are required to hide the > fast serial connection is C64 mode." I can't find this bidirectional buffer in the C128 schematic (zimmers). Wrong schematic? FrankReceived on 2019-01-10 18:01:00
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