[TUHS] System III - TCP/IP

Oliver Lehmann lehmann at ans-netz.de
Mon Nov 9 19:40:00 AEST 2015

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:


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.

More information about the TUHS mailing list