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DELPHI Collaboration
DELPHI 94--12 DAS 149
17th October 1994
Using the Paging Facility of the SPS 256k G64 Processor
T.J. Adye and G.R. Smith
Rutherford Appleton Laboratory
Abstract:
The Motorola 6809 processor can normally only access 64 kilobytes of
memory, since addresses are limited to 16 bits. Of this 16 kilobytes are used
by FLEX and the monitor.
As Omegasoft Pascal programs on the G64 systems have become more
complex, it has been found that their size has become too large for the
48 kilobytes normally available. The SPS paging processor has 256 kilobytes of
RAM on the one card, and further memory cards are available (the largest
giving 384k). This extra memory is at the moment used only for virtual disk
storage and some extra FLEX facilities (the latter only use a few kilobytes);
so it was felt highly desirable to make use of this extra memory. This
document describes one method of doing this.
T J Adye
Mon Feb 6 20:09:07 GMT 1995