[comp.sys.ibm.ps2.hardware] PS2 50Z question!

ALEX@auvm.auvm.edu (Alexander Couloumbis) (04/16/91)

  Can someone explain to me how the memory addressing works on the
onboard memory slot.  The ps2 50Z can address up to 16Mbytes of
RAM right?  What is the deal with the onboard slot?  Any input
on this subject will be much appreciated!

-Alex.

From The Mind Of <U39648@uicvm.uic.edu> (04/17/91)

>  Can someone explain to me how the memory addressing works on the
>onboard memory slot.  The ps2 50Z can address up to 16Mbytes of
>RAM right?  What is the deal with the onboard slot?  Any input
>on this subject will be much appreciated!

Well, the IBM PS/2 Model 50Z has an Intel 80286 which can directly
address 16M of memory.  It has a SIMM slot on the motherboard which
can accomodate one 36-bit IBM PS/2-type SIMM, either 1M or 2M.
If you use 85ns or faster memory, it can access it at zero wait
states.  (up with 120ns with one wait state)

You can add up to the total of 16M of memory (most expansion boards
for 16-bit slots can hold up to 8M) using the Micro Channel slots.
This is plain extended memory, the kind OS/2 and Windows likes.

It's possible, although don't ask me with whose boards, you could
also add up to 32M of LIMspec 4.0 EMS (expanded) memory using the
Micro Channel slots.  (or you could use any of the software or
hardware methods to use your extended memory as expanded)

- Darius
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