no success with the 6551 even with CTS grounded In coninit I changed LDA #$CA for LDA #$0B 1 stop bit, 8bits, internal baud rate, 9600 bauds 1.8432 Mhz is on XTAL1 there is a signal on CS1 showing the rom code is running and accessing the ACIA after the initialisation the code running is: LOOP LDA #$24 JSR CONOUT JMP LOOP same result with a w65c51 running with david gray hack to replace the check of TDRE a signal is received on pin RXD no signal out of the TXD pin on the 6551 or w65c51 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 2023-10-27 17:00:08
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