🚀 go-pugleaf

In article <1992Aug26.060638.10407@ee.ubc.ca>
  williamb@ee.ubc.ca (william burchill) writes:
>A floating bus is not going to confuse a memory testing program, that's
>what it's looking for.  What do you mean "didn't work well"?

Well, at the risk of making myself look totally stupid, the following is a
simplified version of what I am trying to do.  I do use other test patterns
in addition to $5a5a5a.  Failure on any one pattern should break the loop.
The program just doesn't exit the loop.  I have never written a memory
test program, so please forgive some ignorance :-)  Thanks.

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ERAM_Base	equ	8192		; Start address of external DSP RAM on NeXT
	
	<some init stuff>

	move	#>ERAM_Base,R0
TestLoop
	move	#>$5a5a5a,b		;load test pattern
	move	b,x:(R0)		;write to a memory loc
	move	x:(R0)+,a		;read back into A1, post-incr address.
	cmp	a,b
	jne	memory_fail

	<same things with different test patterns>

	jmp	TestLoop

memory_fail
	<report R0 value to host>


--
Izumi Ohzawa
USMail: University of California, 360 Minor Hall, Berkeley, CA 94720
Telephone: (510) 642-6440     Fax:  (510) 642-3323
Internet: izumi@pinoko.berkeley.edu (NeXT Mail OK)