On Fri, Mar 5, 2021 at 6:33 PM Paul Koning via cctalk <cctalk@classiccmp.org> wrote:
> I would have liked better comms. The USART has such a tiny FIFO that you > can't run it at higher than 9600 bps even with the J-11 CPU. At least not > with RSTS; perhaps a lighter weight OS can do better. The printer port is > worse, that one can't run DDCMP reliably at more than 4800 bps. I normally > run DDCMP on the PC3XC, which is a 4-line serial card that uses two dual > UART chips (2681?) with reasonable FIFO. > There seem to be a great many models of Unibus and Qbus multi-port async serial boards, which present different register-level interfaces, e.g. for Unibus, DH11, DHU11, DJ11, DM11, DZ11 . Which ones are considered "best", for each bus, for use with a multitasking OS like RSTS/E or RSX-11M+?