[simh] RSTS processor identification
bqt at softjar.se
Fri Mar 5 21:08:50 CST 2021
On 2021-03-06 03:22, Eric Smith wrote:
> On Fri, Mar 5, 2021 at 6:33 PM Paul Koning via cctalk
> <cctalk at classiccmp.org <mailto:cctalk at 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
In general, you should pick a controller that can do as much as possible
Which means DH11 or DHU11 for Unibus.
Similar with Qbus: DHV11.
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