From mboxrd@z Thu Jan  1 00:00:00 1970
From: lehmann@ans-netz.de (Oliver Lehmann)
Date: Mon, 09 Nov 2015 10:40:00 +0100
Subject: [TUHS] System III - TCP/IP
In-Reply-To: <20151109091646.Horde.WJOBgOU20u5J3ItIHNJDwO9@avocado.salatschuessel.net>
References: <20151107200358.Horde.M1lYZZyTC4t0Qb8KrygKzhy@avocado.salatschuessel.net>
 <20151107192043.GA11895@mcvoy.com>
 <CAC20D2NnLC2H=+8ZzpXEpgUqa+qW3JuFMLeWjL_Su9OBoHWBZQ@mail.gmail.com>
 <20151107231338.Horde.d8EIgIMMf9VYCExfovc2K_M@avocado.salatschuessel.net>
 <20151108051028.GA32246@cowbell.employees.org>
 <CAH1jEzbzpuwzncuEFQMHHD-pHHk_4SHre2PY5BPZNpY_HAgXCw@mail.gmail.com>
 <20151108143817.Horde.tlWgdF0OWmzmg-kXXO-AxUO@avocado.salatschuessel.net>
 <CAH1jEzarQAW4ucfP81RRhP0pgkFiHiiMAH9F=a6DsEEiU0Uy=Q@mail.gmail.com>
 <20151109091551.Horde.vyfPFb7gspsxIQB3WGNcE_A@avocado.salatschuessel.net>
 <20151109091646.Horde.WJOBgOU20u5J3ItIHNJDwO9@avocado.salatschuessel.net>
Message-ID: <20151109104000.Horde.mZW7kq6nXQAQyqwKfyBtDlp@avocado.salatschuessel.net>

This is for example the ureg.c which shows the Segmentation Code for the
current SysIII Kernel I redid from original SysIII Sources + Disassembled
object-File analysis of the current SysIII Kernel running on the system:

http://cvs.laladev.org/index.html/P8000/WEGA/src/uts/sys/ureg.c?rev=1.1&content-type=text/x-cvsweb-markup



Oliver Lehmann <lehmann at ans-netz.de> wrote:

> I hit the send button to fast :(
>
> Oliver Lehmann <lehmann at ans-netz.de> wrote:
>
>> Nick Downing <downing.nick at gmail.com> wrote:
>>
>>> You can most likely implement a split I/D architecture by having code
>>> execute out of a different segment than data, although I haven't
>>> checked the datasheet so I don't know for sure if this is possible.
>>
>> I have 3 different MMUs available. Stack, Code and Data it is called in
>> the Circuit diagram. I probably have to lookup the references but I still
>> don't get why the kernel can only work with 64k of RAM as it is right now
>> compiled as a segmented programm and uses more memory already with SysIII.
>> Only the boot0-loader is compiled unsegmented and also some small
>> utilities. Every other portion of the system uses the segmentation features
>> of the Z8001 and is not limited to 64k adressable space.
>>
>> The system has right now MB of
>
> The system has right now around 6 MB of RAM but can be upgraded to 16MB
> minus 64KB (Due to a firmware bug) of RAM.