README for dspmemsize.asm [V0.90, 92-09-10]
  
Description: Program to find if the external DSP RAM is 8kw or 32kw
on NeXT.

Tested for Release 2.1
 
 
Written by Izumi Ohzawa.
 
It does not do a real test, but relies on memory map of 8k/32kword
configurations.

If larger DSP RAM expansion becomes available for NeXT, this program
will break and must be modified accordingly.

Currently, it simply test if there are actually 32k unique memory
cells that can retain values.  This is done by writing the address
value into each memory location, and reading them back to see if
the address == content.

If any mismatch is found, then we just assume that the external
RAM size is 8kw.

Mismatches will be found for 8kw configuration because 8kw of RAM
is aliased into 32kw address space multiple times, i.e., same
physical memory cell appears at 4 different addresses.

If all 32kwords can retain unique values, we assume the RAM size
is 32kw (it may be actually larger if larger SIMM is installed.

Since all addresses are presented with memory cells, we don't have
to worry about floating data lines.