> On Dec 23, 2015, at 4:30 PM, Bob Supnik wrote:
>
> There's nothing conditional about the user documentation. The 1965 reference
> manual says, "MARS (Memory Address Register Storage) Check Light. This light
> is turned on when a digit in MARS has a parity error or an
It's worse than that. The detailed logic is shown on 227-5631-0 pp
188ff. The decode chart for each decode switch (DSW) is:
DSW 0
DSW 10001
DSW 20010
DSW 3X011
DSW 4X100
DSW 5X101
DSW 6X110
DSW 7X111
DSW 81XX0
DSW 9
All,
Thanks for the comments and feedback on the bootstrap loader analysis. I
have edited it to reflect the input I received, but it is still a work
in progress. I will continue to refine it as my understanding of the
area expandes. Here is the related, simpler, writeup of booting PDP-11
On Wed, 23 Dec 2015 23:51:47 -0800 (PST)
b...@gewt.net wrote:
> As it is largely just serial, I can think of museum displays this could
> benefit (next pet project: SDL in a console framebuffer) due to the
> simple adapter needed (http://www.wickensonline.co.uk/vaxen/linuxLK.html)
>
> Thoughts?
Will, you got it. :-)
I didn't check through my inbox before writing my replies, and Paul
already put you on track.
Johnny
On 2015-12-24 05:30, Will Senn wrote:
On 12/23/15 5:09 PM, Johnny Billquist wrote:
As for your analysis:
Your explanation of branches seems somewhat over
On 2015-12-24 02:02, Will Senn wrote:
On 12/23/15 5:09 PM, Johnny Billquist wrote:
As for your analysis:
Your explanation of branches seems somewhat over complicated. The
instruction is indeed in just 8 bits, while 8 bits are the offset.
However, there is no need to mess things up with
On 2015-12-24 02:02, Will Senn wrote:
On 12/23/15 5:09 PM, Johnny Billquist wrote:
As for your analysis:
Your explanation of branches seems somewhat over complicated. The
instruction is indeed in just 8 bits, while 8 bits are the offset.
However, there is no need to mess things up with