: Re: [Simh] FW: pdp 11 timing
RT11 distribution comes with (uncommented) sources.
Johnny
On 2020-07-21 00:31, Paul Moore wrote:
At the moment my ambitions are very lightweight. A pdp 11/20 with a cassette
drive (why that? cos CAPS11 is the first sw listed on the simh sw kit page).
And next
-edge.com
Subject: Re: [Simh] FW: pdp 11 timing
RT11 distribution comes with (uncommented) sources.
Johnny
On 2020-07-21 00:31, Paul Moore wrote:
> At the moment my ambitions are very lightweight. A pdp 11/20 with a cassette
> drive (why that? cos CAPS11 is the first sw listed on the simh
mh On Behalf Of
> s...@swabhawat.com
> > Sent: Monday, July 20, 2020 3:14 PM
> > To: Simh@trailing-edge.com
> > Subject: [Simh] FW: pdp 11 timing -->anf10 workstation on pdp11 with
> throttling
> >
> >
> >
> > L.S.
> >
> > Actually where
On Behalf Of s...@swabhawat.com
Sent: Monday, July 20, 2020 3:14 PM
To: Simh@trailing-edge.com
Subject: [Simh] FW: pdp 11 timing -->anf10 workstation on pdp11 with throttling
L.S.
Actually where this is important, is when using Pdp11 based ANF10 workstations
in the Tops10 realm.
When start
> ... there is plenty of software that assumes that an interrupt does not
> happen before a single instruction have been executed after the previous
> interrupt, from the same device, for example.
On the ibm1130 (a different machine of course) we found a case where a driver
expected to execute
ng in their own realm ...
>
>
> Reindert
>
> -Original Message-
> From: Johnny Billquist [mailto:b...@softjar.se]
> Sent: Tuesday, 21 July, 2020 00:16
> To: s...@swabhawat.com; simh@trailing-edge.com
> Subject: Re: [Simh] FW: pdp 11 timing --> dectapes
>
> I thin
> Well, then the first question that needs to be answered, which model
> of PDP-11 was that code expected to run on
ANF-10 primarily runs on the 11/40 (well, and the PDP-10s). Exceptions:
DN200 remote station: 11/34, DN22: 11/04 .
CHK11 compiles accordingly.
On 20-Jul-20 18:19, Johnny
iron though.
Reindert
-Original Message-
From: Johnny Billquist [mailto:b...@softjar.se]
Sent: Tuesday, 21 July, 2020 00:19
To: s...@swabhawat.com; Simh@trailing-edge.com
Subject: Re: [Simh] FW: pdp 11 timing -->anf10 workstation on pdp11 with
throttling
Well, then the first quest
: [Simh] FW: pdp 11 timing -->anf10 workstation on pdp11 with throttling
L.S.
Actually where this is important, is when using Pdp11 based ANF10 workstations
in the Tops10 realm.
When starting up, the Anf10 software on the pdp11 sim test various devices for
functionality thereby us
in their own realm ...
Reindert
-Original Message-
From: Johnny Billquist [mailto:b...@softjar.se]
Sent: Tuesday, 21 July, 2020 00:16
To: s...@swabhawat.com; simh@trailing-edge.com
Subject: Re: [Simh] FW: pdp 11 timing --> dectapes
I think Paul's suggestion was if you actually keep a ti
Well, then the first question that needs to be answered, which model of
PDP-11 was that code expected to run on, because the results will differ
depending on that. Also, what kind of memory? (I would guess some old,
small core memory boards.)
The PDP-11 execution speed really does vary based on
I think Paul's suggestion was if you actually keep a tight look at
timing, the extra two bits actually do appear in the other register as
DMA is going on, so you could just blindly read them out at the right
times, and it might work...
Johnny
On 2020-07-21 00:12, s...@swabhawat.com wrote:
L.S.
Actually where this is important, is when using Pdp11 based ANF10 workstations
in the Tops10 realm.
When starting up, the Anf10 software on the pdp11 sim test various devices for
functionality thereby using instruction count based loops etc.
When all the devices necessary (paper tape
L.S.
When in the past using dectapes, we read/wrote Pdp10/8 dectapes on Rsx11-D.
On the Pdp11, you could do that only with READALL in interrupt mode to get the
2 extra bits, not in the standard dma mode.
Other (timesharing) users weren’t that happy because the interrupt processing
locked them
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