Good memory board for Heath H-11?
rich.cini at verizon.net
Wed Feb 10 07:14:39 CST 2016
I just picked up an M8044-CC (16kw) so that should hold me for a while. I need to print the manual so I can set the switches right.
Sent from my iPhone
> On Feb 9, 2016, at 10:47 PM, Jerome H. Fine <jhfinedp3k at compsys.to> wrote:
> >Rich Cini wrote:
>> Thanks guys. This is really helpful. I was getting confused between the M8044 and M7944 boards. Max memory for the LSI-11 is 32kw, right?
> Correct, the maximum memory on a board is 32kw.
> For an LSI-11 (aka PDP-11/03) without any MMU hardware,
> the actual maximum memory that can be accessed must also allow
> for the IOPAGE registers. Usually, the IOPAGE address range
> is 4 kw which leaves 28kw for everything else, including RT-11
> (assuming that is what you are running). There is one option
> available with some hardware to reduce the address range
> set aside for the IOPAGE to just 2kw which then leaves
> 30kw for everything else. Unless you are running a specific
> program which requires the extra 2kw, it is probably not
> worth the extra effort.
> Jerome Fine
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