I tried to push it a bit in speed... works at 1, 2, 4 Mhz a few failure at 8Mhz On 28/10/2023 13:34, didier_at_aida.org wrote: > It finally works... bad rockwell 6551 chip > > worked fine with a synertek 6551 and another rockwell 6551 > > > On 27/10/2023 14:51, Gerrit Heitsch wrote: >> On 10/27/23 14:45, didier_at_aida.org wrote: >>> I'm still struggling with the Rockwell 6551 >>> >>> I probably did something wrong but I can's see what >>> >>> RX / TX are connected >>> >>> CTS/RTS are not connected >> >> The CTS pin needs to be grounded when not used. See schematics for >> the Plus/4. >> >> Gerrit >> >> >> >> >> >> >Received on 2023-10-28 14:00:20
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